@@ronanchristiana.belleza9270 Typically, barrel lengths are chosen based on how much powder you expect to burn, on average. You always want positive pressure behind the round until it is out of the barrel. Normally, without an evacuator, this pressure would equalize fairly quickly, and the toxic gasses could slip back into the crew compartment. I.e. a not very attractive plunger. The evacuator basically prolongs this equalization, and forces it to happen forward of the evacuator (away from the turret) like a (relatively) soft puff of air lasting for a few seconds after firing. This makes negative pressure near the crew compartment, to pull fresh air through the barrel while the breach is open, preventing toxic gasses from getting into the crew compartment. If you ever see old tanks lift their gun right after firing, they're doing this because they don't have an evacuator, typically. The hope is that they can point the gun up enough that the hot gasses want to escape away from the turret.
@@ronanchristiana.belleza9270projectiles create a vacuum behind them so without good evacuation Id expect the barrel to suck on the gases rather than expel them. but not too aggressively because it isn't sealed
I know I go on about quality and whatnot, but sometimes it is as simple as making something work. Quality should be seen as the best option for the specific task, not as the best thing ever in general
@@F.R.E.D.D2986quality doesn't have to be complicated. That evacuator is so simple there is really nothing that can go wrong with it. Probably only being replaced when they replace the barrel.
Ever seen how we tested the stabilizers for a tank once? We put a beer on the barrel and ped all over the place with it! We also ave silencers for tanks that look like dicks
my dad was a tank mechanic in the 80s. I was obsessed with tanks as a kid. I think I made him repeat everything he knew at least 100000x. I remember toward the end when I'd ask about the "barrel bump" the long explanation became "so the crew doesnt die" lol
I'm sure it must have made your dad really proud to be able to share his knowledge with you especially knowing it was something you had a sincere interest in. Stuff like that often means a lot more than we ever think about. Pretty cool y'all had that opportunity❤
Did the obsession turned into helping build bigger and better tanks? Otherwise there’s no major contribution to society it seems! This isn’t meant for your dad.
One night in Iraq that became known amongst my unit as "THE four hour fire fight" my light infantry unit was operating with a mechanized infantry unit. My best friend and I are in the prone with our SAWs pulling security and around us Abrams and Bradleys are zipping around almost running us over and the RPG's being shot at them were hitting right near us. This one Abrams took a hit, stopped, rotated it's turret towards the shooter, and BOOM fired it's main gun maybe 10 feet to my right. It was awesome but definitely did a number on my hearing. No clue what happened to the guy that thought shooting a RPG at an Abrams was a good idea.
@@douglasgay4497 Oh, I'd definitely not call who we were fighting soldiers. They were either gurillas or martyrs. The martyrs do the stupid stuff that gets them zapped and the gurillas live to fight another day and using the martyrs deaths as a recruitment tool.
@@douglasgay4497 To borrow from the Fat Electrician: He made the mistake of thinking he was the main character. He wasn't but he did get a 'conciliatory' mention in the credits as "Bologna Mist Cloud #1":
I was on the Sheridan, M48, M60, M60A1, M1 Abrams with a 105 mm rifle bore main gun. The bulge is a Bore Evacuator. It gets rid of gas after the main round is fired. It has to be unscrewed, the holes cleaned of carbon using very large q-tips.
Here's how I understand it: During firing, lots of the toxic gas is ejected from the barrel, but some stays in the barrel and can be leaked back into the tank, especially once the toxic gas pressure inside the barrel drops below atmospheric pressure outside (~1 bar). By adding that attachment, some high velocity gas is slowed down, increasing its pressure (by the Venturi effect), allowing it to push out more of the high velocity, low pressure toxic gas after firing. Maybe I totally missed it idk lol
@deadlylampshade4065 I think the idea is that there's not a section of low pressure gas which sucks air into the barrel and forces it to move backwards into the crew chamber. It just equalizes the pressure in the barrel to keep the flow from reversing
@@deadlylampshade4065. There is no “clean” air. The gasses stored in the bore evacuate are pushed toward the muzzle and pull all the gasses in the bore with it.
@deadlylampshade4065 it doesn't need clean air. It just needs to get rid of the dirty air. The cannon can become a minor vacuum for a bit. The goal is to not get the toxic gases back in the crew compartment.
I was a 19K30 in the army for nine years. I was on a tank for those who don’t know. This thing is one smooth ride and firing on the run was a genius idea. I will tell you that in garrison they go 45 to 50 miles an hour. In war that governor is taken off and its balls to the walls. We could get it up to 70 if we needed to. This video is talking about the bore evacuator. Basically the round shell burns up in the main gun when fired and the smoke and fumes it creates comes out of that bulge. So all that’s left is the aft cap so it can be reused. It’s also another way of telling how many rounds we fired being the carry 40 rounds max.
@@thomgizzizHave you ever fired an M1 Abrams main gun before? The M1 Abrams really is the best tank in the world along with the German Leopard 2. Look at what M1 Abrams did to Saddam Hussein Russian T-72 tanks in Iraq during "Operation Desert Storm" ....
@@224dot0dot0dot10 Those were "Lions of Babylon" tanks, locally produced in Iraq. They were not up to Soviet standard. Also the Abrams is much newer than the T72 and has undergone constant modernization upgrades. Bad comparison, guy.
@@Hillary4SupremeRulerwhenever an object leaves a space, gases or fluids, depending where it is moving, fill the space the object was occupying. Watch again. Think of when a boat moves. Have you ever watched its wake?
Gas from tank round explosion bad. If no bulge present gas stay in barrel and when crew open barrel to reload round, gas go in where crew is and no good for crew. With bulge the gas is sucked out as round leaves. Hope that helped.
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
I was looking for this comment! I'll only read through the comments that follow a video &/or narrative that incorrectly describes the other, leaving the comment when required.
@@chev2500hd1 Wrong. The holes are 5 holes drilled at a 30 degree angle toward the muzzle. The Bore evacuator does not expand. Only some noob would call it "dragon's breath'. This sounds like something a private would make up. It's called a flare-back.
Furries: furiously claim they are not zoo files Also furries: obsessed with animal parts to the point that it's the first thing they think about when watching a tank gun barrel video.
Thank you for this, i tried looking up why a secondary puff of smoke comes out so much later than the initial firing and Google had no idea wtf i was talking about 😂
the exiting of the projectile acts to create a negative pressure in the barrel, therefore, the smoke will want to come out since everything seeks to be at equilibrium. hope i got it right
My dad was a tank commander (M4A3 Sherman) at the end of WWII. There was one little vent fan about the size of a kitchen fan in his tank. Firing the 75mm straight tube gun smoked the interior up so bad you could barely breathe or see. Dad said that’s why you always saw pictures of Sherman tanks with the commander standing in the hatch. That’s also why tank commanders had a short life expectancy in combat.
I was a 91A Abram’s mechanic in the U.S. Army for 4 years, and I remember when I was taught how the bore evacuator worked in tank school at Harmony Church of (previously) Fort Benning, it blew my mind how simple the design was, and yet so effective. While observing my first test fire from the loaders seat, I noticed that after the breach dropped and kicked the aft cap, the disturbed dust in the air was violently sucked into the block from the low pressure zone created by the 5 jets at the evac. It was truly a unique way to experience the beauty of the Venturi effect. To add a small correction, the design you’ve displayed here isn’t quite correct. The gun tube (not barrel) has 5 holes drilled at an angle (45 degrees if my memory serves me) to the surface, and the shell covers these holes. After the projectile is sent down the barrel the holes allow the shell to become pressurized, after the round exits the gun tube, the pressure in the bore evacuator then returns back through the angled holes the pressure entered from while the projectile remained present in the tube. This creates a directional stream of air out the front of the gun tube itself ensuring crew safety.
As a former armor crewman, we called the “bore evacuators”. Less smoke inside the turret and the rest was sucked out by the “turret evacuation fan”. I miss those days.
@@SelectCircle I think you're basing your opinion on youtube videos depicting 2 countries whos use of combined arms tactics and old tech leaves a lot to be desired. Further, current anti drone technology currently allows singular troop level engagement or swarm level engagement of drones. (VAMPIRE, Lattice and Anvil, DroneGun, Silent Archer, MEDUSA and Mjölnir to name a few) . Not to mention APS devices like TROPHY. Threats change, tactics/tech changes accordingly. Tanks will be around for centuries to come.
@@32Umzy It's almost a shame that on the future automated battlefield courage like yours won't be needed. The fighting will be done by drones and bots.
You unscrew the evacuator before you go to gunnery and clean out the little holes with pipe cleaners. If they are dirty or clogged it’s possible they will not work properly and you will get the flames back inside the turret as soon as you fire.
@@TheXXIIIrdVet no clue. I wasn’t a master gunner. And I don’t think it affects the velocity. The APFSDS round exits the muzzle with a velocity at around 1mile per second.
There are videos of MBTs firing their main guns on YT. If it has a bore evacuator, there will be a puff of smoke coming out of the barrel a second or two after the round leaves the gun. If you have ever wondered why that happens, it is the bore evacuator in action.
Exactly, that floored me, it’s relatively “thin barrel” visible, it looks solid, not bending… would have never thought it was 3+ tons either. Goodness…
So I initially assumed that it was for the gasses produced during the firing of the projector, however I did not realize it was to prevent the gasses from entering the crew chamber. That was a very cool video, awesome job!
After the round is fired, the bulge stop the pressure wave from killing the crew. It allows the propellant gas to be delayed behind the round and escape through the front of the barrel after the round exits. I think.
No bulge = the excess gas is so much that it has to flow backwards into the crew causing all sorts of issues. Bulge = gas has more room to travel to while still able to propel the round forward and no gas into the crew
Does the breech open while the round is still traveling down the barrel? If not, why would the pressure inside the barrel be higher than inside the turret?
That isn’t a very good depiction of how a bore evaluator works. There are four small holes in the barrel angled toward the muzzle. As the round goes past, some of the gasses pressurize the bore evacuator. After the round leaves the muzzle and the pressure equalizes the gas in the bore evacuator rushes out pulling the gasses in the barrel with it.
That makes more sense than most of these other attempts to explain it. I think it's fair to say that many people who watched this video fundamentally didn't get it, which leads me to think he didn't explain it well.
@@tanker335 Never made it to Germany until after I retired. I bounced back and forth between Korea and the states. I know the DMZ well. I was on M60A3s for 4 1/2 years. Great tank.
@@nesa1126 Probably not for the most part, but surely there are differences (however slight) between ones centered on the barrel and not, both from an engineering and a physics standpoint, otherwise they'd all be the same. Will have to do some reading 'cause it would be cool to know what they are.
@@brandonb6164 I'd considered that but it looked offset from the top too, as if the bore was on a diagonal, but perhaps that's just because of the viewing angle.
Imagine how insane this idea must’ve sounded “What if we make it wider so that gas can get away from the projectile,and then have it get sucked out when it leaves the barrel”
3 дні тому
Somebody had to picture fluid dynamics in order to come up with that idea, and then they had to put it in terms everybody can understand. Now that's genius!
Some people say it is better to have a magic sword than a magic shield but to them I say NEIN!!! Warfare is SCIENCE! The science of shields! "But Karl what do you think of das axe oder spear" I say this is RUBBISH!!!
Fun fact: The first tank gun to feature bore evacuators is the British Royal Ordnance L7 which was designed in the late 50s! It was used on tanks like the Centurion, Leopard 1 and the M48 Patton.
It is more like an air pressure bypass. The round pushes airthrough the barrel in front of it and this pressure escapes into that device, instead of travelling all the way out the front of the barrel. The round passes the device and the pressurized air from the device flows into the barrel after the round again, flushing the propellant gases out of the barrel. And it might even reduce the resistance of the air in front of the round
The Boar Evacuator allows a high pressure to form and as the round leaves the barrel and SUCKS the remaining gasses out of the barrel because a low pressure at the barrel holes draws the high pressure gasses at the boat evacuator.
I always figured it had something to do with equalizing pressure, or possibly being a cooling mechanism to prevent the barrel from warping. It's so you don't choke. Huh.
You forgot to mention that it also makes the projectile fly faster, cause it’s delaying the gas expansion by only a small margin. Basically it gives the shell enough time to get past its own gas that’s why you always see the canon shell flying out before you see the explosion.
@chev2500hd1 From what i can see of this, the gases are pushed out, in much the same way you'd be pushed out (and not pulled or sucked out) an aeroplane window if it were to break.
@@castleanthrax1833 brother, do you know what the venturi effect is? the gasses are pulled out by way of vacuum. dont rely on this animation of the bore ecav in operation it is 100% incorrect
@@chev2500hd1 This is a simple equalisation of pressure. There is no constant mechanical force involved. The action of the shell creates a partial vacuum, and then the equalisation of pressure forces the remaining gases out of the barrel.
There's nothing more satisfying than a super elegant solution to a challenging problem. Bruce Lee said simplicity is the key to brilliance. This is some truly brilliant engineering.
Having served on the M1/A1/A2 versions I know exactly what this is, this is a bore evacuator. It helps to reduce pressure in the gun tube when fired and adds in the evacuation of gasses hence its name. Trust me the last thing you want is combustible gasses coming back into the turret and possibly igniting, I.E. a flashback, not fun at all. Sure there is a fire suppression system, Halon charged, but no one wants to have to unass the tank for that, least of all the driver. Ask one that has had to do so.
Do the gases not shoot forward and escape out the barrel in front of the round as it travels through the chamber? I could see why this would evacuate pressure (assuming the pressure in the barrel is less than 1 atmosphere a moment after firing) but how does that not invalidate the pressure built up in the end half of the barrel, where accelerating the round is concerned? Just seems like something that would perform at its function better if it was closer to the end of the barrel, much like how a flow-through suppressor works on a rifle barrel to reduce back pressure and gases in the face of the shooter.
This is basically the same way a suppressor or silencer works. The bang you hear when a gun fires is two-fold. 1) it's the bullet breaching the sound barrier and it's the sonic hop you hear. 2) It's the explosion from the gunpowder and primer that pushes the bullet through the barrel and that extreme pressure exits the end of the barrel. A suppressor catches number 2 above and slows it or redirects it inside the suppressor and quietens that explosion. If you really want a quiet gun, you use subsonic ammunition that stays under the sound barrier and there is no crack. A suppressor and subsonic ammo is very quiet.
It is needed because it is a breach loaded manual gun. Without it the hot gasses could shoot back into the breach when it is opened. It isn't on autoloader like the french or russians because it isn't needed. Without it, you would drastically lower the firerate of the manual loaded guns. Because you would have to wait for all the gas to disperse from the barrel
Being a 19-E m60a3 gunner E5/12 was a trip. If you could be inside and see how it all worked, you'd be fascinated. Loud,loud,loud. From the cherry juice running through it veins, track sounds, commands being yelled over the Como. And you hear the word Up! On the way, and a touch of the caddilacs... there it is, the most powerful sound she makes. And then the cherry on top is when the 60 D and 50 cal start talking, and I look into the flaming asshole and let the coax tell her tale. Death Before Dismount. And then you hear a humming bird, and it comes eye to eye. And all of a sudden, the beast becomes your incendiary. No worries, the good thing is, you won't feel or remember a thing... The End...
The bore evacuater fits tightly around the barrel creating a reservoir to contain the pressurized gases. There are around 5 holes drilled in midway, at about 50 degree angle towards the front center equally around the barrel circumference. As the round passes the holes, compressed gas enter backward the evacuator chamber until the round leaves the mussel. After the round is sent, gas pressure equalizes in the barrel the compressed gases in the evacuator blows forword sucking the remaining gases out the front.
The fact that the cannon alone weighs 3.3 tons is mind-blowing.
So is the round that exits it
I love how so many people are missing the joke that the explanation has more likes
@@aplanenerdandagamenerd9087What? no
@@artraudgaming3575 Pretty sure they're saying the round is mind blowing, not that it weighs 3.3 tons.
And they're right.
@@CSpottsGaming ah yeah
Not sure if it means the entire upper turret or the barrel? Hard to imagine that the barrel weighs that much alone.
And the round exiting the barrel acts as a plunger pulling the gases with the rounds exit out of the barrel. Smart.
It would still do that without the evacuator
@@LanaaAmornot nearly as effectively, though
@@yerteth Can you explain please?
@@ronanchristiana.belleza9270
Typically, barrel lengths are chosen based on how much powder you expect to burn, on average. You always want positive pressure behind the round until it is out of the barrel.
Normally, without an evacuator, this pressure would equalize fairly quickly, and the toxic gasses could slip back into the crew compartment. I.e. a not very attractive plunger.
The evacuator basically prolongs this equalization, and forces it to happen forward of the evacuator (away from the turret) like a (relatively) soft puff of air lasting for a few seconds after firing. This makes negative pressure near the crew compartment, to pull fresh air through the barrel while the breach is open, preventing toxic gasses from getting into the crew compartment.
If you ever see old tanks lift their gun right after firing, they're doing this because they don't have an evacuator, typically. The hope is that they can point the gun up enough that the hot gasses want to escape away from the turret.
@@ronanchristiana.belleza9270projectiles create a vacuum behind them so without good evacuation Id expect the barrel to suck on the gases rather than expel them. but not too aggressively because it isn't sealed
As someone with a gun bulge himself, this was very insightful
Sounds painful, see a doctor 😂
Bro💀💀💀💀
Me too right up top
I guess your gun bulge is for evacuating gas. I’m sorry to hear that.
That's not right if it's the middle
I like the logic behind simple engineering like this, it simply works so there's no need to overcomplicate the process
"It works, there's no moving parts to get f@cked, means less maintenance."
K.I.S.S. in action; Keep It Simple, Stupid.
"It just works"
The best solutions for the problems usually are the simplest!
I know I go on about quality and whatnot, but sometimes it is as simple as making something work.
Quality should be seen as the best option for the specific task, not as the best thing ever in general
@@F.R.E.D.D2986quality doesn't have to be complicated. That evacuator is so simple there is really nothing that can go wrong with it. Probably only being replaced when they replace the barrel.
That's how you identify the adult male tanks.
LMAO
female tanks have machine guns only
🤦🏾♂️🤣 Stop
it removed my comment on tankettes
I agree. This guy has a nice description but it’s all wrong. That bulge is representative of the bulge I get from all of that freedom.
Those German engineers are fucking wizards
Good old Kraut space magic
Ever seen how we tested the stabilizers for a tank once? We put a beer on the barrel and ped all over the place with it! We also ave silencers for tanks that look like dicks
Quite literally, too.
Poor wizards.
@@kampfmuffins5507 Just read this comment and dying for more context, please fill me in with more tank info I won't realistically ever use.
Bro you have no idea how happy it makes me that you don’t use an ai to voice your shorts 😭
AI narrator are ruining youtube I swear
@@xenostimye, using your own voice is a USP nowadays lol
it makes you that happy? stop crying for god's sake.
@@gordonlekfors2708stop crying
His accent is equally annoying.
I also have a bulge in my midsection, and evacuating gasses is a concern for anyone around me.
Your Adam’s apple that huge? You know what they say about men with big Adam’s apples…
🤣
You might want to see the doctor if there’s one in the back too
😂
You need an expansion valve
Very clear explanation. I was a tanker for 8 years. We just told people "because" 😆
Excellent clear and succinct explanation lol
Same here for the same time. Sometimes, it's easier just to say that than to go into detail. Like how a CITV works lol
For those of you that dont know, the German engineers used magic to make the barrel within remain floating.
Ah, more of that infamous Kraut Space Magic.
Vril
Stolen Dutch magic seems more likely.
You just put a note on the drawing and it happens.
my dad was a tank mechanic in the 80s. I was obsessed with tanks as a kid. I think I made him repeat everything he knew at least 100000x. I remember toward the end when I'd ask about the "barrel bump" the long explanation became "so the crew doesnt die" lol
I'm sure it must have made your dad really proud to be able to share his knowledge with you especially knowing it was something you had a sincere interest in. Stuff like that often means a lot more than we ever think about.
Pretty cool y'all had that opportunity❤
Did the obsession turned into helping build bigger and better tanks? Otherwise there’s no major contribution to society it seems! This isn’t meant for your dad.
@@alvaroq2024 What im the fuck are you even trying to say here dude?
sure kept his mind refreshed on a bunch of stuff we would forget as mechanics
@@alvaroq2024by the answer you got from the doctor, it did not. 😂😂😂😂
One night in Iraq that became known amongst my unit as "THE four hour fire fight" my light infantry unit was operating with a mechanized infantry unit. My best friend and I are in the prone with our SAWs pulling security and around us Abrams and Bradleys are zipping around almost running us over and the RPG's being shot at them were hitting right near us. This one Abrams took a hit, stopped, rotated it's turret towards the shooter, and BOOM fired it's main gun maybe 10 feet to my right. It was awesome but definitely did a number on my hearing. No clue what happened to the guy that thought shooting a RPG at an Abrams was a good idea.
Lol, some soldiers aren't very smart.!
I think we have a pretty good idea of what happened to him, lol. Thanks for your service sir
@@douglasgay4497
Oh, I'd definitely not call who we were fighting soldiers. They were either gurillas or martyrs. The martyrs do the stupid stuff that gets them zapped and the gurillas live to fight another day and using the martyrs deaths as a recruitment tool.
@@Aquablecs
Yeah I would've loved to see his face when he realized those 70+ virgins are all dudes like him lol.
@@douglasgay4497 To borrow from the Fat Electrician: He made the mistake of thinking he was the main character. He wasn't but he did get a 'conciliatory' mention in the credits as "Bologna Mist Cloud #1":
It would've been so effective in the battle of the bulge
More like the battle of my bulge
🤨🤨
I see what you did there...
@@suntzu1409 with you art of war, it would've been used in the battle of the bulge
Battle of the bulgey wulgy
That bulge has been there since that trip to Saigon. My doctor told me it's normal. Oh you mean the bulge on the barrel of the tank...
😂😂😂
I was on the Sheridan, M48, M60, M60A1, M1 Abrams with a 105 mm rifle bore main gun. The bulge is a Bore Evacuator. It gets rid of gas after the main round is fired. It has to be unscrewed, the holes cleaned of carbon using very large q-tips.
Yes, the M1A1 doesn't have a 120mm gun as he mentioned - that was only the M1A2.
@@yorokobi9530 ?? part of the M1A1 upgrade program was the addition of the 120mm gun
I need some of these big Q tips
I do not miss the borescope... lol. better than changing track though..
Which is your favorite and why?
American Freedom is in fact delivered by Germany, how ironic xD
USSR too.
And British armor
@chipschannel9494 we use a different variety of composite armor than British choban. Ours includes depleted uranium while theirs does not.
@@davesomeone4059 USSR is a joke.
@@belekas2729 and yet had better rocket motors than anyone in the west for 40 years lol
You see when a male tank sees a female tank...
Best comment 😭
lol
Tank nicknamed "big papa" seeing the tank nicknamed "big mama"
if only half of a males "barrel" bulges... they really need to see a doctor
You didn't say that in your Mike Brady voice,"You see ,Bobby...."& drone on until the point of boring the entire audience.
Here's how I understand it: During firing, lots of the toxic gas is ejected from the barrel, but some stays in the barrel and can be leaked back into the tank, especially once the toxic gas pressure inside the barrel drops below atmospheric pressure outside (~1 bar). By adding that attachment, some high velocity gas is slowed down, increasing its pressure (by the Venturi effect), allowing it to push out more of the high velocity, low pressure toxic gas after firing.
Maybe I totally missed it idk lol
I think you’re spot on with this
But where does the 'clean' air come from? How isn't this just expelling toxic gas with more toxic gas?
@deadlylampshade4065 I think the idea is that there's not a section of low pressure gas which sucks air into the barrel and forces it to move backwards into the crew chamber. It just equalizes the pressure in the barrel to keep the flow from reversing
@@deadlylampshade4065. There is no “clean” air. The gasses stored in the bore evacuate are pushed toward the muzzle and pull all the gasses in the bore with it.
@deadlylampshade4065 it doesn't need clean air. It just needs to get rid of the dirty air. The cannon can become a minor vacuum for a bit. The goal is to not get the toxic gases back in the crew compartment.
I was a 19K30 in the army for nine years. I was on a tank for those who don’t know. This thing is one smooth ride and firing on the run was a genius idea. I will tell you that in garrison they go 45 to 50 miles an hour. In war that governor is taken off and its balls to the walls. We could get it up to 70 if we needed to. This video is talking about the bore evacuator. Basically the round shell burns up in the main gun when fired and the smoke and fumes it creates comes out of that bulge. So all that’s left is the aft cap so it can be reused. It’s also another way of telling how many rounds we fired being the carry 40 rounds max.
Me while I watch this:
Don’t make a bulge joke
*DON’T DO A BULGE JOKE*
Must be a real battle, huh?
@@rainbowwhitey9274 I literally made this comment to get the 2,000 comment
Germans must be so proud, after so many years their guns are still the best!
Those are used on literally the oldest and worst tanks the US has at this point... smh
@@thomgizzizHave you ever fired an M1 Abrams main gun before? The M1 Abrams really is the best tank in the world along with the German Leopard 2. Look at what M1 Abrams did to Saddam Hussein Russian T-72 tanks in Iraq during "Operation Desert Storm" ....
@@224dot0dot0dot10 Best tank in the world, I need some of what you've been smoking.
@@224dot0dot0dot10 Those were "Lions of Babylon" tanks, locally produced in Iraq. They were not up to Soviet standard. Also the Abrams is much newer than the T72 and has undergone constant modernization upgrades. Bad comparison, guy.
@@krashdso whats the best in your opinion then? enlighten us
Thank you for that explanation. Now I just need to understand what the explanation means 😂
Seriously I don't get it 😔
@@Hillary4SupremeRulerwhenever an object leaves a space, gases or fluids, depending where it is moving, fill the space the object was occupying. Watch again. Think of when a boat moves. Have you ever watched its wake?
It just means you do not get the gas from a fired round inside the tank when you reload the gun.
Gas from tank round explosion bad. If no bulge present gas stay in barrel and when crew open barrel to reload round, gas go in where crew is and no good for crew. With bulge the gas is sucked out as round leaves. Hope that helped.
They just complicated things more than necessary
Just like a 2-stroke exhaust works: venturi effect.
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
It’s a little bit more complicated than that!!! The round is about 3 feet tall and when it fires what is left is just the end cap that’s about 5 inches long! Everything else is converted into expanding gases! When you open the breach the end cap falls out and the remaining gas is that second small puff u see
I was looking for this comment! I'll only read through the comments that follow a video &/or narrative that incorrectly describes the other, leaving the comment when required.
@@chev2500hd1 Wrong. The holes are 5 holes drilled at a 30 degree angle toward the muzzle.
The Bore evacuator does not expand.
Only some noob would call it "dragon's breath'. This sounds like something a private would make up.
It's called a flare-back.
@mattz1230 lol okay toughie
Nah that's just where the shell break dances for a second.
real
"Gun Knot"
*I TRIED TO STOP MYSELF FROM SAYING IT*
Great. Now cannot unsee.
If you're just gonna go for it, I have to:
**notices your explosive gas reservoir** OwO what's this?
Found the animal molester.
It's okay we understand
Furries: furiously claim they are not zoo files
Also furries: obsessed with animal parts to the point that it's the first thing they think about when watching a tank gun barrel video.
Placement also prevents 'barrel whip' by deharmonizing it's length's natural frequency.
Huh¿¿
Is that a bore evacuator, or are you just happy to see me?😩
😂😂
Lmfao!😂😂😂
Thank you for this, i tried looking up why a secondary puff of smoke comes out so much later than the initial firing and Google had no idea wtf i was talking about 😂
😂😂BAAHAAHAA HILARIOUS 😆😆😂🤣🤣😂😂😂🤣😂😂
No our shop replaced the barrel and anything that you want to know I will explain it to you!!! It was my job in the ARMY 45G 45K !!!!
@@bryanhill3041Your US Army MOS was 45G (forty five golf) or was your US Army MOS 45K (forty five kilo) ?
the exiting of the projectile acts to create a negative pressure in the barrel, therefore, the smoke will want to come out since everything seeks to be at equilibrium.
hope i got it right
My dad was a tank commander (M4A3 Sherman) at the end of WWII. There was one little vent fan about the size of a kitchen fan in his tank. Firing the 75mm straight tube gun smoked the interior up so bad you could barely breathe or see. Dad said that’s why you always saw pictures of Sherman tanks with the commander standing in the hatch. That’s also why tank commanders had a short life expectancy in combat.
I was a 91A Abram’s mechanic in the U.S. Army for 4 years, and I remember when I was taught how the bore evacuator worked in tank school at Harmony Church of (previously) Fort Benning, it blew my mind how simple the design was, and yet so effective. While observing my first test fire from the loaders seat, I noticed that after the breach dropped and kicked the aft cap, the disturbed dust in the air was violently sucked into the block from the low pressure zone created by the 5 jets at the evac. It was truly a unique way to experience the beauty of the Venturi effect.
To add a small correction, the design you’ve displayed here isn’t quite correct. The gun tube (not barrel) has 5 holes drilled at an angle (45 degrees if my memory serves me) to the surface, and the shell covers these holes. After the projectile is sent down the barrel the holes allow the shell to become pressurized, after the round exits the gun tube, the pressure in the bore evacuator then returns back through the angled holes the pressure entered from while the projectile remained present in the tube. This creates a directional stream of air out the front of the gun tube itself ensuring crew safety.
It’s called “The Pleasure Ring” for the untrained eye.
💀
As a former armor crewman, we called the “bore evacuators”. Less smoke inside the turret and the rest was sucked out by the “turret evacuation fan”. I miss those days.
What do you think now that cheap little drones have made tanks obsolete?
@@SelectCircle I think you're basing your opinion on youtube videos depicting 2 countries whos use of combined arms tactics and old tech leaves a lot to be desired. Further, current anti drone technology currently allows singular troop level engagement or swarm level engagement of drones. (VAMPIRE, Lattice and Anvil, DroneGun, Silent Archer, MEDUSA and Mjölnir to name a few) . Not to mention APS devices like TROPHY. Threats change, tactics/tech changes accordingly. Tanks will be around for centuries to come.
@@32Umzy So you'd hop into a tank and floor it for the front lines?
@@SelectCircle I did it for quite a few years, so if recalled (to a U.S conflict), the answer would be yes.
@@32Umzy It's almost a shame that on the future automated battlefield courage like yours won't be needed. The fighting will be done by drones and bots.
You unscrew the evacuator before you go to gunnery and clean out the little holes with pipe cleaners. If they are dirty or clogged it’s possible they will not work properly and you will get the flames back inside the turret as soon as you fire.
So... does the evacuator bleed barrel pressure from the round?
Does the projectile lose velocity after the evacuator?
@@TheXXIIIrdVet no clue. I wasn’t a master gunner. And I don’t think it affects the velocity. The APFSDS round exits the muzzle with a velocity at around 1mile per second.
?
The tank is just happy to see us!
There are videos of MBTs firing their main guns on YT. If it has a bore evacuator, there will be a puff of smoke coming out of the barrel a second or two after the round leaves the gun. If you have ever wondered why that happens, it is the bore evacuator in action.
RealEngineering: _notices bulge_ "UwU what's this?"
Edit: I'm sorry.
Thanks for the comment
The reaction time on you thinking of and posting this comment was concerningly fast
You should be.
Apology begrudgingly accepted but don't do it again
Why are you like this? I laughed tho so worth it, thank you
3.3 TONS?! Imagine the gun your packing weighs as much as 3 sedans. Jesus christ.
Whole vehicle is upwards of 70 tons...
@@coydavis1340 Wow, that's crazy. That's at least two of my exes.
What sedan weighs 1 ton?
Exactly, that floored me, it’s relatively “thin barrel” visible, it looks solid, not bending… would have never thought it was 3+ tons either. Goodness…
@@FireRupee or near a tenth of your exes mom! D:
So I initially assumed that it was for the gasses produced during the firing of the projector, however I did not realize it was to prevent the gasses from entering the crew chamber. That was a very cool video, awesome job!
I always thought it was an evolutionary adaptation for mating. The more you know.
It depends on which "ton" they mean. A small car weighs 1-2 tons. In the US, 1 ton = 2,000 lbs = 907 kgs.
Thanks for explaining. I still don't get it.
After the round is fired, the bulge stop the pressure wave from killing the crew. It allows the propellant gas to be delayed behind the round and escape through the front of the barrel after the round exits. I think.
No bulge = the excess gas is so much that it has to flow backwards into the crew causing all sorts of issues. Bulge = gas has more room to travel to while still able to propel the round forward and no gas into the crew
It prevents the crew from being miserable to the point of permanent health issues by making sure the smoke exits the barrel on the correct side
Does the breech open while the round is still traveling down the barrel? If not, why would the pressure inside the barrel be higher than inside the turret?
It's also a first approximation silencer, Rolls Royce use something similar on car exhausts.
Keeping that barrel straight is a major priority
Gay ones won't work as well.
and polished 🥴
That isn’t a very good depiction of how a bore evaluator works. There are four small holes in the barrel angled toward the muzzle. As the round goes past, some of the gasses pressurize the bore evacuator. After the round leaves the muzzle and the pressure equalizes the gas in the bore evacuator rushes out pulling the gasses in the barrel with it.
That makes more sense than most of these other attempts to explain it. I think it's fair to say that many people who watched this video fundamentally didn't get it, which leads me to think he didn't explain it well.
@@davidhoffman6980 Well, I was a tanker for 25 years and ended up as a Master Gunner so I know my way around a tank.
@@TheJimtanker Charlie Co. 3rd Batt. 35th Armor. I was lucky enough to serve on the M60A3 and the M1A1. I have a jar of dirt from Graf on our mantle.
@@tanker335 Never made it to Germany until after I retired. I bounced back and forth between Korea and the states. I know the DMZ well. I was on M60A3s for 4 1/2 years. Great tank.
@@TheJimtanker I drove our blade tank. Occasionally, I'd let our XO pretend it was his tank.😄
Supereyepatchwolf is really diversifying his content. Good for him 😂
It’s like a Venturi effect. Genius.
I was taught that it's a "fume extractor." Same thing, different description.
That’s the knot
🤨
Bro fr 💀
💀bro
noooooooo im sobbing
why was i thinking the same thing 😢
Why is it shown as being offset on the tank but not in the diagram?
I don't think it changes anything
Because the diagram is a view from the top
@@nesa1126 Probably not for the most part, but surely there are differences (however slight) between ones centered on the barrel and not, both from an engineering and a physics standpoint, otherwise they'd all be the same. Will have to do some reading 'cause it would be cool to know what they are.
@@brandonb6164 I'd considered that but it looked offset from the top too, as if the bore was on a diagonal, but perhaps that's just because of the viewing angle.
I believe it was designed that way so the evacuator would be able to clear the upper glacis of the tank when fully depressed
It's nice to know that Eoin does more than just woodworking videos.
Channels that are clean and lubricated are the only kind I like 😂
😂 damn Rhinemetal still making weapons we just pretty much adopted Germany's War Machine
What can I say, we are good at making cannons :P
If it ain't broke, don't fix it.
You're welcome BTW
They own the patent, and licensed the invention to us.
USA conquered Germany and now can steal every pattern rights
Gem-Tech makes an AR-15 upper with a similar bulge on the barrel to reduce gases going back to the shooter.
Why? The AR platform is gas-operated, which requires the pressure to cycle the bolt.
Unless they've developed something new, which is a possibility.
@@georgetheofanous6792 not all of that gas is needed
@@crash86ed Understood. I learned something new today. Thanks.
Is that a bore evacuator or are you just happy to see me?
I always thought the fume extractor operated using some kind of mechanical movement, but it's even simpler than that. Thanks for the explanation!
Imagine how insane this idea must’ve sounded
“What if we make it wider so that gas can get away from the projectile,and then have it get sucked out when it leaves the barrel”
Somebody had to picture fluid dynamics in order to come up with that idea, and then they had to put it in terms everybody can understand. Now that's genius!
German engineering ist ze finest in ze world
Think you mean ZA WARUDO
I would hire a German company to make medical and scientific instruments. I would NOT hire them to make shovels. ❤
@@andrewstallings6548 You must be one of the Germans, that is very efficient thinking.
@@andrewstallings6548 I don't get it. When did germans fuck up making shovels?
Some people say it is better to have a magic sword than a magic shield but to them I say NEIN!!! Warfare is SCIENCE! The science of shields! "But Karl what do you think of das axe oder spear" I say this is RUBBISH!!!
Bore Evac. Shoots the majority of the gases out the end of the tube
Fun fact: The first tank gun to feature bore evacuators is the British Royal Ordnance L7 which was designed in the late 50s! It was used on tanks like the Centurion, Leopard 1 and the M48 Patton.
The L7 wasn’t the first tank gun to use a bore evacuator.
@@Notreallysureactually then which was it?
@@fighter_750wasn’t D-10T2S on T-54A/B?
I’m so glad supereyepatchwolf has been expanding his content recently. Always wanted to hear him talk about tanks
The Mason videos are honestly my favorite. Over the main channel even
Its the catalytic converter duh
Nope. Duh.
So, the tank can fart.
lol
so it's for muzzling? UwU
more like the tank equivalent of preventing constipation and having your small intenstine explode because of that
It is more like an air pressure bypass. The round pushes airthrough the barrel in front of it and this pressure escapes into that device, instead of travelling all the way out the front of the barrel. The round passes the device and the pressurized air from the device flows into the barrel after the round again, flushing the propellant gases out of the barrel. And it might even reduce the resistance of the air in front of the round
*nuzzles your evacuator bulgey wulgey" OwO such a big gun tee hee~
The number of furries in these comments tho 🤣🤣🤣🤣
@@SkilletFlooferI swear half the furry fandom is milfurs OR programmers running the world.
I'm pretty sure half the military is just Furries too.
What an elegant yet simple solution
I am so sorry but I cannot unhear super eyepatchwolf's voice
The Boar Evacuator allows a high pressure to form and as the round leaves the barrel and SUCKS the remaining gasses out of the barrel because a low pressure at the barrel holes draws the high pressure gasses at the boat evacuator.
Bore*
Boar = 🐗
I always wondered how those worked.
I always figured it had something to do with equalizing pressure, or possibly being a cooling mechanism to prevent the barrel from warping. It's so you don't choke. Huh.
A considerable amount of the barrel is actually inside the tank
I wouldn't call some... a considerable amount.
Most is breech and gun block
@@timharnans yes but because of the armour in the front of the turret you can’t put crew there so you have to move the gun back into the turret
@@draysoncrook4898 reloading the cannon outside the tank might also be a problem
that's why you should always measure from the butthole especially if it's cold outside.
You forgot to mention that it also makes the projectile fly faster, cause it’s delaying the gas expansion by only a small margin. Basically it gives the shell enough time to get past its own gas that’s why you always see the canon shell flying out before you see the explosion.
That's genius. Low tech and incredibly effective
So that explains after the shot, smoke comes out of the nozzle as if its being pushed out.
It IS being pushed out.
the expelled gasses are in fact pulled out by way of vacuum when the gases exit the bore evac.
@chev2500hd1 From what i can see of this, the gases are pushed out, in much the same way you'd be pushed out (and not pulled or sucked out) an aeroplane window if it were to break.
@@castleanthrax1833 brother, do you know what the venturi effect is? the gasses are pulled out by way of vacuum. dont rely on this animation of the bore ecav in operation it is 100% incorrect
@@chev2500hd1 This is a simple equalisation of pressure. There is no constant mechanical force involved. The action of the shell creates a partial vacuum, and then the equalisation of pressure forces the remaining gases out of the barrel.
Which was the first tank to be fitted with a muzzle brake?
Not counting prototypes and tanks that never went into major production, probably the Panzer IV in the late 30's.
TANKS FOR THE MEMORIES!!!!!!!!!!!!!!!!!!!!!!!!!!!
There's nothing more satisfying than a super elegant solution to a challenging problem. Bruce Lee said simplicity is the key to brilliance. This is some truly brilliant engineering.
Having served on the M1/A1/A2 versions I know exactly what this is, this is a bore evacuator. It helps to reduce pressure in the gun tube when fired and adds in the evacuation of gasses hence its name. Trust me the last thing you want is combustible gasses coming back into the turret and possibly igniting, I.E. a flashback, not fun at all. Sure there is a fire suppression system, Halon charged, but no one wants to have to unass the tank for that, least of all the driver. Ask one that has had to do so.
My chicken nugget had bulges and forced a gas out of me
Do the gases not shoot forward and escape out the barrel in front of the round as it travels through the chamber? I could see why this would evacuate pressure (assuming the pressure in the barrel is less than 1 atmosphere a moment after firing) but how does that not invalidate the pressure built up in the end half of the barrel, where accelerating the round is concerned? Just seems like something that would perform at its function better if it was closer to the end of the barrel, much like how a flow-through suppressor works on a rifle barrel to reduce back pressure and gases in the face of the shooter.
The guy narrating this sounds like Super Eyepatch Wolf
This is basically the same way a suppressor or silencer works. The bang you hear when a gun fires is two-fold. 1) it's the bullet breaching the sound barrier and it's the sonic hop you hear. 2) It's the explosion from the gunpowder and primer that pushes the bullet through the barrel and that extreme pressure exits the end of the barrel.
A suppressor catches number 2 above and slows it or redirects it inside the suppressor and quietens that explosion. If you really want a quiet gun, you use subsonic ammunition that stays under the sound barrier and there is no crack. A suppressor and subsonic ammo is very quiet.
It is needed because it is a breach loaded manual gun. Without it the hot gasses could shoot back into the breach when it is opened.
It isn't on autoloader like the french or russians because it isn't needed.
Without it, you would drastically lower the firerate of the manual loaded guns. Because you would have to wait for all the gas to disperse from the barrel
Being a world of tanks player, always wondered what they were. Thanks for the information. Nice n crisp 👍👍👍
Just saw these barrels being manufactured last week. Cool stuff.
Props to the person who made the render we see in the beginning! Super well done!
Huh. A random UA-cam short answered a question Ive had since 2003 but was too lazy to ever look into. Love it
Genuinely interesting. Solid info.
Thank you.
I’ve wondered this for years and been to lazy to look it up
Man, Your renders are mint these days.
Cool illustration.
Just seems like a catalytic converter.
_This just in, tanks around the US are found missing half of their barrels!_
Such beautiful workings for such a destructive tool.
That's actually pretty clever.
I didnt know supereyepatchwolf did gun shorts now lol
And keep putting out the great content I love learning new stuff like this
A pressure reservoir is actually called an “accumulator” and is a big part of fluid power system design. Good video
just finished the rotc, getting deployed tomorrow. Wish me luck brothers.
For a week this video has been haunting my recommendations. I didnt even know there was a bulge there. I dgaf about tanks. Thanks for the video!
the bulge prevents the other competitive tanks in the squad from pushing the barrel off course before he can shoot his round inside of the target
Being a 19-E m60a3 gunner E5/12 was a trip. If you could be inside and see how it all worked, you'd be fascinated. Loud,loud,loud. From the cherry juice running through it veins, track sounds, commands being yelled over the Como. And you hear the word Up! On the way, and a touch of the caddilacs... there it is, the most powerful sound she makes. And then the cherry on top is when the 60 D and 50 cal start talking, and I look into the flaming asshole and let the coax tell her tale. Death Before Dismount. And then you hear a humming bird, and it comes eye to eye. And all of a sudden, the beast becomes your incendiary. No worries, the good thing is, you won't feel or remember a thing... The End...
I honeslty like the aesthetics of the barrel like that. Looks meaner than a smooth barrel
The bore evacuater fits tightly around the barrel creating a reservoir to contain the pressurized gases. There are around 5 holes drilled in midway, at about 50 degree angle towards the front center equally around the barrel circumference. As the round passes the holes, compressed gas enter backward the evacuator chamber until the round leaves the mussel. After the round is sent, gas pressure equalizes in the barrel the compressed gases in the evacuator blows forword sucking the remaining gases out the front.