It's called a "Bernoulli Pump" and we used them in the Navy to multiply the volume of water that our pumps could move, for about the same power. A stream of moving fluid (air being a fluid here) tends to draw surrounding fluid along with it. the air is compressed and pressurized by the plunger, pushing it against the primed dart, and the release is the air rebounding like a spring let free: equal and opposite reaction means the launcher and the dart air pushed away from each-other. upon release; the air is high pressure at the face of the plunger and the rear face of the forward dart, but it's motion in the middle is suddenly flipped to low pressure. (until equilibrium is reach based on the mass of the air, if your barrel were long enough and the system were sealed, you could stop the dart dead in the tube as the air is "stretched", until it's density (and thus, pressure) is too low: making a vacuum force where atmospheric pressure is pushing the dart into the blaster, rather than out.) (this flip commences from about the middle of the mass of the compressed air, and radiates outward rapidly) the low pressure of the moving air "sucks" (rather, the higher pressure of ambient air is pushing) the dart forward. If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air: the Bernoulli Effect would draw them forward into the moving stream of air. EDIT: spelling
"If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air" Sounds to me like Matt needs to look into a fully automatic nerf air-tank-powered blaster now!
So are you saying the plunger system is not necessary, and it can be replaced with a compressor or that the plunger system can have the air compressor feed darts as it recocks without pulling air ?
im loving all of these stupid simple solutions to things, like putting water on the dowels to make them expand. The blaster's design is also pretty awesome
Honestly, probably the best "build explanation" section I've seen out of any of the building channels I watch, because you went step by step on everything and explained how you did pretty much every little section, while most building channels tend to just cover the key points.
Gotta admit, the dart head as a dampener is pretty smart. Love your ideas, may not be good for quick firing, but they work and its goofy yet useable and reliable.
I think the key moment for the back dart is when the front dart exits the barrel. The higher pressure air is then connected to the outside atmosphere, which sucks it forward, which in turn propels the back dart as a temporary low pressure region is created behind the air wave escaping the barrel.
Holy cow, this channel's production quality has skyrocketed since I first subbed. Great to see the work you continue to put into making these projects!
The dart moves forward because the air mass in the barrel has a ton of energy. When the main piston stops moving and the air mass in the tube wants to keep going, it creates a massive vacuum that sucks the dart into the barrel. This is legitimately how engine performance exhaust headers work to clear the combustion chamber of all spent gasses and allows the chamber to be under vacuum for the next intake cycle.
Actually, you can defy physics, physics being the systems of math we use to predict how reality interacts with itself. Defying these predictions leads to new and better physics! But good luck doing that with a nerf blasters; usually it takes a Large Haldron Collider!
Dude you are such an awesome channel! It’s fascinating watching you build these and all the unique techniques you use, like just adding water to expand the wood, I’d have never thought of that.
I love not just how much planning you put into this, but also how you did everything properly. No "let's eyeball some markings for the drill and then yolo it" as I see so many other creators on youtube doing. I appreciate how much thought and diligence you put into this
I was expecting the venturi effect, and we observed the venturi effect here... just not exactly how I imagined. Firing creates a low pressure zone in the chamber, which pulls the rear dart forward. Pressure differential isn't nearly enough to fire the dart all the way through, of course, as we see. Brilliant build, I love it.
It is not the venturi effect though. Venturi effect exists in a steady state flow, and the reduction in pressure from the venturi effect is only a reduction of pressure relative to the flow itself. When you have hundreds of psi pressure in an airgun you're not going to get a drop below atmospheric pressure (14.7 psi). Rather what we see is a pressure drop after the firing sequence because the air in the barrel had momentum and continued to travel out. Only a momentary pressure drop, a single pulse of low pressure, not a steady state process like venturi.
The reason why the dart is pulled by the action is probably the same reason behind a "vacuum ejector", the movement of a higher pressure air passing through a channel can create a vacuum.
The inertia of the air flowing out, after the first piece left the barrel, creates a bit of lower pressure at the end of a firing sequence which drags the second one in a bit.
Love this kind of content. I'm trying to remake my nerf collection after mom sold it (without my consent). I might just start building my own blasters!
I have recently begun building my own homemades (following nerfhaven guides) and I am inspired by your precision and ingenuity. They make me want to bring another level of polish to my blasters :) keep up the great work!
Wow. These nerf blasters are getting better and better. You should try making a nerf blaster machine gun that can be set up on your car or something. Maybe even add a place where you can sit to control it by hand instead of remote control
this is cool. Seems like another variation of the "inline clip". Been using inline clips in most of my projects and this opens up many more awesome potential for this kinda ammo reloading.Thanks
This is perfect for me to learn Some videos just don’t explain in a way where I understand enough to build my own functional version. And I looked EVERYWHERE and this was just randomly recommended to me. I am so happy! Nice video!
You’re a very naughty youtuber, but the sheer quality of the video more than makes up for that. Seems pretty obvious why the 2nd dart gets pulled into the breech - the momentum of the air leaving the barrel causes a momentary vacuum which sucks it forward.
Dude, I gotta say your fabrication techniques are really smart. By the 5 minute mark I had learned 3 new things for fabrication. Heve you ever thought of doing a series on fabrication?
simplest explanation i can think of: fast air has lower pressure so once that pressurized air expands and accelerates it actually drops below outside pressure and the second dart moves forward from the pressure difference
To test if it’s a drop in air pressure in the barrel is what moves the dart forward, you could test using shorter barrels so that there is still pressurized air when the dart leaves the barrel.
The rear dart is moving forward because you are not dumping the same volume of air in to the barrel as the there is in the barrel when each darts are on opposite sides. This is creating a small vacuum right before the front dart leaves the barrel. Two options to fix this. One shorten the barrel or two make the compressed air chamber bigger.
All the ways you compensate for not having a milling machine are such good ideas. I learnt so many hacks for ghetto precision! I don’t have a milling machine so I wouldn’t know if it would play nice with that pipe.
Bernoulli's principle is probably drawing the second dart forward. You can check by loading just one dart and providing a constant stream of air through the barrel.
This is gonna go so good with my H2 hand blaster i have been dying to figure out a loading mechanism that doesn't need to cycle with recoil. but have been facing issues with sealing the breach. Now THIS solves everything. Thanks mate this gonna help a lot.❤
Slick build! And I love how you're bringing so much innovation to pump action PVC blasters. This is some truly DaVinci stuff; breathing new life into the old arts. My theory for why the dart is pulled forward is a slightly off-tune barrel. I'm sure you calculated the plunger and barrel volumes, but I bet there's a bit of leakage when the blaster is fired, meaning there's not quite enough air to fill the barrel. So the momentum of the shot dart can pull the barrel pressure a bit low, sucking the second dart forward. I'll leave it up to you to see if this is a feature or a bug 😂
I'm probably never going to build a Nerf blaster in particular but i really like the construction techniques you used, i will adopt some of them. If i don't forget.
Reducing the length of the barrel would let you know when friction is more powerful than the reduction of air pressure and you would notice this by the rear seal dart not moving forward. Or a stiffer spring moving faster might allow an even longer barrel, tunable again by not allowing the rear dart to nudge forward. Very awesome mechanical engineering and very awesome build ! Impressive!!!
I think that effect is the same principle as fluid hammer ('water hammer') Though the net pressure never drops below atmosphere, gas movement has an inertia that creates a vacuum when the plunger suddenly stops. This similar in principle to the Venturi effect, though the configuration likely means it is not truly Venturi
I'm going with the Bernoulli effect. I was expecting the blast of air exiting the barrel to create a vacuum in the barrel, which caused the dart to fly... I guess it's not enough to do that, but clearly it's enough to prime the dart.
If what you said about the internal pressure being less than the external pressure (10:02), then you need to decrease the barrel length or increase the pressure to increase the bullet velocity. That suction force that pulls the rear dart forward is also slowing down the forward dart.
The second dart is sucked in because the volume of air in the barrel is higher than the air from the cylinder. By the time the first dart clears the barrel it's creating a vacuum. Shorten the barrel or increase the volume of the pump cylinder
What probably happens to the dart is that it gets sucked in, and then the opening behind it gives an easier way for air to release pressure through the back as soon as the dart passes the hole
It's called a "Bernoulli Pump" and we used them in the Navy to multiply the volume of water that our pumps could move, for about the same power. A stream of moving fluid (air being a fluid here) tends to draw surrounding fluid along with it.
the air is compressed and pressurized by the plunger, pushing it against the primed dart, and the release is the air rebounding like a spring let free: equal and opposite reaction means the launcher and the dart air pushed away from each-other.
upon release; the air is high pressure at the face of the plunger and the rear face of the forward dart, but it's motion in the middle is suddenly flipped to low pressure. (until equilibrium is reach based on the mass of the air, if your barrel were long enough and the system were sealed, you could stop the dart dead in the tube as the air is "stretched", until it's density (and thus, pressure) is too low: making a vacuum force where atmospheric pressure is pushing the dart into the blaster, rather than out.)
(this flip commences from about the middle of the mass of the compressed air, and radiates outward rapidly)
the low pressure of the moving air "sucks" (rather, the higher pressure of ambient air is pushing) the dart forward.
If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air: the Bernoulli Effect would draw them forward into the moving stream of air.
EDIT: spelling
"If you ran constant air through it with a compressor air tank, you could continuously feed darts into it without having to feed them all the way in front of the moving air"
Sounds to me like Matt needs to look into a fully automatic nerf air-tank-powered blaster now!
So are you saying the plunger system is not necessary, and it can be replaced with a compressor or that the plunger system can have the air compressor feed darts as it recocks without pulling air ?
That's probably what's going on here. It somewhat reminded me of barrel evacuators on tanks and how they pull the smoke out of the barrel.
@@kilotheneko2064yes, you know some odd vacuums are made this way.
sounds to me like a mouth powered atomiser ( www.google.com/search?q=mouth+atomiser )
im loving all of these stupid simple solutions to things, like putting water on the dowels to make them expand. The blaster's design is also pretty awesome
e x p a n d
Bigmode@@mattie_y
That's so brilliant.
To be fair I wouldn't be surprised if Matt could find a way to defy physics
Because he can.
that pen holder from the beginning is very clever!
ty!
Matt, your production quality has actually gotten that of a professional.
tyty
The dart is so excited for it's turn to get launched, that it wiggles forward into the barrel.
That drill press balance is such a good idea
Genius, not because of the blaster design but how smart you were manufacturing it
o7 rip sacraficial dowels
they will not be forgotten
@@mattie_y type F in the chat
F
F
F
I love how this channel grew from simply modding a long shot and now defying physics itself
Honestly, probably the best "build explanation" section I've seen out of any of the building channels I watch, because you went step by step on everything and explained how you did pretty much every little section, while most building channels tend to just cover the key points.
Gotta admit, the dart head as a dampener is pretty smart. Love your ideas, may not be good for quick firing, but they work and its goofy yet useable and reliable.
Your resourcefulness and clever tricks are a treat to watch and make you more defined from other channels
I think the key moment for the back dart is when the front dart exits the barrel.
The higher pressure air is then connected to the outside atmosphere, which sucks it forward, which in turn propels the back dart as a temporary low pressure region is created behind the air wave escaping the barrel.
Very clever ideas in this project, but the production value of the video is what really impressed me. You've put a lot into this video and it shows!
Holy cow, this channel's production quality has skyrocketed since I first subbed. Great to see the work you continue to put into making these projects!
The dart moves forward because the air mass in the barrel has a ton of energy. When the main piston stops moving and the air mass in the tube wants to keep going, it creates a massive vacuum that sucks the dart into the barrel. This is legitimately how engine performance exhaust headers work to clear the combustion chamber of all spent gasses and allows the chamber to be under vacuum for the next intake cycle.
Yep. Great explanation, man. It’s all down to momentum.
Everything about this build is clever and shows your skill as a designer ‘and’ craftsman. Well done!
Have you ever brought your builds to a game? Would be cool to see it used in action as well. But the build process is awesome keep up the great work.
nope
@@mattie_y 😥
@@mattie_y You really should, all of your stuff is very cool and reminds me of old Nerf homemades
I’ve been here since your first video. You’ve come a long way.
I have a suggestion for the next blaster. Try and design, a ww1 era, open-bolt rifle, fed by clips ofc, really wanna see your take on that
Nice clickbait title- you cannot defy physics. *Rings a bell* SHAME! *repeats forever*
More like "defies your intuition of physics"; would be clickbaity enough while not being a false statement in lots of cases
Oh you can defy physics, it just never works out.
It's not really clickbait, because everyone understands that...
More like...... eh.....idk
Actually, you can defy physics, physics being the systems of math we use to predict how reality interacts with itself. Defying these predictions leads to new and better physics!
But good luck doing that with a nerf blasters; usually it takes a Large Haldron Collider!
Nice work as always! Thanks for the useful techniques to accomplish that precise slot on the cylinder.
Love all the creative solutions to make do with what you got!
mate bloody good job, amazing work
Dude you are such an awesome channel! It’s fascinating watching you build these and all the unique techniques you use, like just adding water to expand the wood, I’d have never thought of that.
I love not just how much planning you put into this, but also how you did everything properly. No "let's eyeball some markings for the drill and then yolo it" as I see so many other creators on youtube doing. I appreciate how much thought and diligence you put into this
I met you and open sauce and shot the blaster you had there. it was super cool! thanks for letting me try :)
I was expecting the venturi effect, and we observed the venturi effect here... just not exactly how I imagined.
Firing creates a low pressure zone in the chamber, which pulls the rear dart forward. Pressure differential isn't nearly enough to fire the dart all the way through, of course, as we see.
Brilliant build, I love it.
It is not the venturi effect though. Venturi effect exists in a steady state flow, and the reduction in pressure from the venturi effect is only a reduction of pressure relative to the flow itself. When you have hundreds of psi pressure in an airgun you're not going to get a drop below atmospheric pressure (14.7 psi). Rather what we see is a pressure drop after the firing sequence because the air in the barrel had momentum and continued to travel out. Only a momentary pressure drop, a single pulse of low pressure, not a steady state process like venturi.
im probably making this overly complicated but fitting a aloff’s device to the blaster and linking it to the pump handle would be awesome
Something may defy your understanding of physics, but nothing defies physics.
The pen-holding technique garnered my subscription. I can't wait to share it (and your channel) with our maker co-op folks!
Oh my goodness I get to see a Matt yuan video less than an hour after he posted
The reason why the dart is pulled by the action is probably the same reason behind a "vacuum ejector", the movement of a higher pressure air passing through a channel can create a vacuum.
The inertia of the air flowing out, after the first piece left the barrel, creates a bit of lower pressure at the end of a firing sequence which drags the second one in a bit.
Almost right but air can't drag anything, it can only push.
I'd say the reason why the next dart is brought forward is due to the Venturi effect
Not the Venturi effect, it’s actually another application of Bernoullis principle, so pretty close.
The charge of air leaving the barrel has inertia, so it will draw a vacuum as it exits.
It does not defies physics. It defies your understanding of physics.
this is a genius catch mechanism
You’re the hero we don’t deserve my friend. Seeing you continue to develop traditional nerf modding give me the warm fuzzies
Love this kind of content. I'm trying to remake my nerf collection after mom sold it (without my consent). I might just start building my own blasters!
I have recently begun building my own homemades (following nerfhaven guides) and I am inspired by your precision and ingenuity. They make me want to bring another level of polish to my blasters :) keep up the great work!
I'm in love with your builds. You should build nerf blasters for NASA.
Wow. These nerf blasters are getting better and better. You should try making a nerf blaster machine gun that can be set up on your car or something. Maybe even add a place where you can sit to control it by hand instead of remote control
this is cool. Seems like another variation of the "inline clip". Been using inline clips in most of my projects and this opens up many more awesome potential for this kinda ammo reloading.Thanks
This is perfect for me to learn
Some videos just don’t explain in a way where I understand enough to build my own functional version.
And I looked EVERYWHERE and this was just randomly recommended to me.
I am so happy!
Nice video!
There are so many smart build tips for working with tubes! Great video!
Man the engineering genius that went into designing this thing is insane and it deserves some respect and recognition 😊
I'd love to build some of your designs to add to my homemade collection. Awesome work!!!
Nice work!
The first dart doesn't have enough volume of air pushing it, so the first dart creates a tiny vacuum and pulls dart 2 forward.
This weird thing is also how vacuums with no moving parts and powered by compressed air work
these are some excellent blaster videos, keep it up :3
hey, your editing is getting pretty good. I'm really looking forward to seeing you improve even further.
I love ur approach when you design all of these. Keep it!!! The content is 👍
You’re a very naughty youtuber, but the sheer quality of the video more than makes up for that.
Seems pretty obvious why the 2nd dart gets pulled into the breech - the momentum of the air leaving the barrel causes a momentary vacuum which sucks it forward.
The venturi effect would be a pretty solid explaination i think !
Some of these tips are gold!, centering the drill on a curved surface, watering the dowels, this is all genuis stuff!
Using a dart head as spring-like thing for the trigger was really interesting
The dart being fired is definitely causing a vacuum to be made which is what causes the back dart to be moved forward.
Venturi. At least that is my first thought.
Theoretically this is how a very compact pullpup weapon could become made.
Dude, I gotta say your fabrication techniques are really smart. By the 5 minute mark I had learned 3 new things for fabrication. Heve you ever thought of doing a series on fabrication?
Nice, this was a great redesign to make it capable of automatically reloading!
simplest explanation i can think of: fast air has lower pressure so once that pressurized air expands and accelerates it actually drops below outside pressure and the second dart moves forward from the pressure difference
i love the trigger spring. using a nerf dart tip is so smart but simple, and yet, very few would have thought of that.
To test if it’s a drop in air pressure in the barrel is what moves the dart forward, you could test using shorter barrels so that there is still pressurized air when the dart leaves the barrel.
As someone who is not familiar with this space, The sheer amount of little tricks in this video is so cool
The rear dart is moving forward because you are not dumping the same volume of air in to the barrel as the there is in the barrel when each darts are on opposite sides. This is creating a small vacuum right before the front dart leaves the barrel. Two options to fix this. One shorten the barrel or two make the compressed air chamber bigger.
All the ways you compensate for not having a milling machine are such good ideas. I learnt so many hacks for ghetto precision! I don’t have a milling machine so I wouldn’t know if it would play nice with that pipe.
Bernoulli's principle is probably drawing the second dart forward. You can check by loading just one dart and providing a constant stream of air through the barrel.
I honestly though the dart would be sucked in by the airflow enough for the air to get behind it. In all, a very cool concept!
this guy is doing some of the biggest brain stuff I have ever seen
bro made a nerf recoilless rifle
The rubber dart head as a dampener was pretty smart ngl
To be perfectly honest, I didn't believe for one second you did break the laws of physics. However, I was curious about the trick.😊
The mechanical design and color's trigger something nostalgic for me
That counter balance to drill the pipe earned my like and subscription! Ill use that so much!
Wake up there’s a new Matt yuan video
This is extremely interesting to anyone who doesn't understand what a siphon is.
That intro was sick!
This is gonna go so good with my H2 hand blaster i have been dying to figure out a loading mechanism that doesn't need to cycle with recoil. but have been facing issues with sealing the breach. Now THIS solves everything. Thanks mate this gonna help a lot.❤
Slick build! And I love how you're bringing so much innovation to pump action PVC blasters. This is some truly DaVinci stuff; breathing new life into the old arts.
My theory for why the dart is pulled forward is a slightly off-tune barrel. I'm sure you calculated the plunger and barrel volumes, but I bet there's a bit of leakage when the blaster is fired, meaning there's not quite enough air to fill the barrel. So the momentum of the shot dart can pull the barrel pressure a bit low, sucking the second dart forward.
I'll leave it up to you to see if this is a feature or a bug 😂
Thoughly impressed at the build quality. Some very clever build methods. And great attention to detail. You are very skilled
I'm probably never going to build a Nerf blaster in particular but i really like the construction techniques you used, i will adopt some of them. If i don't forget.
Reducing the length of the barrel would let you know when friction is more powerful than the reduction of air pressure and you would notice this by the rear seal dart not moving forward. Or a stiffer spring moving faster might allow an even longer barrel, tunable again by not allowing the rear dart to nudge forward. Very awesome mechanical engineering and very awesome build ! Impressive!!!
I think it’s drag of the air passing the second darts tip and the barrel pressure behind the first dart prevents it from fully entering the barrel
That's some incredibly clean work there. Love it!
"Lisa in this house we obey the laws of physics!"
I think that what was keeping the sneaky dart in place was the power of pure spite
now give it a main battle tank style breech block cover thing that closes automatically when you load a dart
holy shit youre so thorough, i dont think ive ever seen sacrificial pins used before, great vid :3
I think that effect is the same principle as fluid hammer ('water hammer')
Though the net pressure never drops below atmosphere, gas movement has an inertia that creates a vacuum when the plunger suddenly stops.
This similar in principle to the Venturi effect, though the configuration likely means it is not truly Venturi
I'm going with the Bernoulli effect. I was expecting the blast of air exiting the barrel to create a vacuum in the barrel, which caused the dart to fly... I guess it's not enough to do that, but clearly it's enough to prime the dart.
If what you said about the internal pressure being less than the external pressure (10:02), then you need to decrease the barrel length or increase the pressure to increase the bullet velocity. That suction force that pulls the rear dart forward is also slowing down the forward dart.
So instead of pushing the dart with the air at first, it pulls?
Ingenious
The second dart is sucked in because the volume of air in the barrel is higher than the air from the cylinder. By the time the first dart clears the barrel it's creating a vacuum. Shorten the barrel or increase the volume of the pump cylinder
We got a Nerf Blaster that DEFIES PHYSICS BEFORE GTA-6 😭😭💀🔥🗣
What probably happens to the dart is that it gets sucked in, and then the opening behind it gives an easier way for air to release pressure through the back as soon as the dart passes the hole
You are doing homemade designers proud! Build on!
skewers r cool
You could flip the plunger around and seat the breach at the back of the blaster for a bullpup design
I got here while looking up Bernoulli and Venturi, so it probably has something to do with fluid flow dragging along that next dart.