This is partly incorrect. Ramjets can operate and produce useful thrust at subsonic speeds -- IIRC a bit above Mach 0.5 -- and depending on inlet design can continue operate up to about Mach 3 (though this usually requires variable geometry). The demo here is apparently not a pulsejet; it lacks the distinctive resonance that a pulsejet (valved or valveless) would produce once running at steady state (and believe it or not is *vastly* quieter than a pulsejet this size would be even at idle thrust). The air compression in a ramjet at any speed is mainly due to the divergent intake, which slows the incoming air (which, by Bernoulli principle, raises its pressure -- kinetic energy of the fluid stream is converted to pressure based potential energy). Fuel burning then raises temperature a lot, which gives additional energy so the exhaust (if correctly shaped) will be significantly faster than the incoming air stream, hence producing thrust. Many ramjets can ignite at around 250 kt, but they generally don't produce usable thrust below about 400 kt, and are usually not primary propulsion below about 600 kt (which is still subsonic).
Actually, I don't know what that is, but it's no pulse jet. A pulse jet is just that, the flame pulses, and you can hear it a mile away, because it's extremely loud. Can anyone say German V1.
@@johnshirley8099 Yep, or Colin Furze's "Fart at France" -- he set up a big Lockwood on the Dover cliffs, and indeed received a report from someone who had heard the engine running from Normandy. That's near enough to thirty-five miles, though it's across sea (flat and relatively quiet).
That's an air compressor powered furnace heater... Every home with central heat has one of these.. a fan blowing air,, fuel mixed in and ignited... I made these from spray paint cans when I was about 9... They work better with propane and acetylene as a fuel mix
To the commenters saying this isn't a ram jet. Yes it is indeed a ramjet but here's the catch it's fed with compressed air. Not a pulse jet as those generally sound quite different.
Technically a ram jet uses super fast air and the aerodynamics of a super sharp cone on the ram jets engine intake to compress itself, mix with fuel while superheated (being like mach2+ speeds) and then self igniting creating more thrust. Just saying that ain't happening here
Ramjet vehicles operate around Mach 1-6, but the compressed airflow is subsonic at the point of ignition. Scramjets on the other hand operate anywhere from Mach 12-24 and the compressed air has supersonic velocity at point of ignition.
I had plans for what was called a pressure jet that ran on propane. Are we sure that's not what it is? It doesn't seem to be a ramjet because they usually won't start below 300 mph.
It is a ramjet, but the combustion wasn't steady (perhaps because the high-pressure, high-discharge velocity air supply--which substituted for the high-velocity ram air the engine would use in flight--came out of the regulator in rapid pulses). If that engine had been a pulsejet, it would have been *far* louder, and the pulses--a rapid series of explosions--would have been very distinct and easily audible (and visible, in the exhaust plume flame).
@@TheMrMused Ramjets function most efficiently between mach 3-6 from what a quick google is saying. Ramjets may work subsonic but it sounds like you're implying they're not meant to work supersonic. which is incorrect. I think there's a misunderstanding here though, I was just responding to the comment, pointing out it wasn't still air
And a constant source of compressed air. Maybe "no moving parts" on that little tubular unit, but several in the compressor that filled the air tank. More like a rocket with gaseous oxygen as the oxidizer.
That might be a ramjet, but it’s kind of dumb to watch one stationary. It produces no thrust until it gets to very high speeds. Might as well just light a propane torch and say “hey, look at this”…🤦♂️
A TRUE Ram Jet engine is a simplified engine in which forward accelerated velocity forces air into an intake at a given force, compressing it until it reaches the needed combustion temperature, thus creating a controlled reaction called thrust. A Pulse Jet requires much higher supersonic velocities to be able to function.
It is not a ramjet engine. A ramjet engine works only when the vehicle flies at twice or more than the speed of sound; and thus uses the shockwave phenomena as compressor for the air intake for the engine.
You're describing a scramjet. Those require at least mach 1 to start. (sc = supersonic combustion) Ramjets only work at subsonic, which this is - using the compressed air feed.
@@TheMrMused scramjet is supersonic combustion ramjet engine. RAM here is actually pointing to the process of compression by means of shockwave that can only occur during supersonic flight.
Pulse jet not ramjet....A ramjet only operates at supersonic speeds using directed shockwaves that compress fuel and air for combustion.
That's what I was thinking how is he reaching the sound barrier to get the schokwave cones? Is that what the compressor is supposed to simulate?
This is partly incorrect. Ramjets can operate and produce useful thrust at subsonic speeds -- IIRC a bit above Mach 0.5 -- and depending on inlet design can continue operate up to about Mach 3 (though this usually requires variable geometry). The demo here is apparently not a pulsejet; it lacks the distinctive resonance that a pulsejet (valved or valveless) would produce once running at steady state (and believe it or not is *vastly* quieter than a pulsejet this size would be even at idle thrust).
The air compression in a ramjet at any speed is mainly due to the divergent intake, which slows the incoming air (which, by Bernoulli principle, raises its pressure -- kinetic energy of the fluid stream is converted to pressure based potential energy). Fuel burning then raises temperature a lot, which gives additional energy so the exhaust (if correctly shaped) will be significantly faster than the incoming air stream, hence producing thrust.
Many ramjets can ignite at around 250 kt, but they generally don't produce usable thrust below about 400 kt, and are usually not primary propulsion below about 600 kt (which is still subsonic).
Actually, I don't know what that is, but it's no pulse jet. A pulse jet is just that, the flame pulses, and you can hear it a mile away, because it's extremely loud. Can anyone say German V1.
@@johnshirley8099 Yep, or Colin Furze's "Fart at France" -- he set up a big Lockwood on the Dover cliffs, and indeed received a report from someone who had heard the engine running from Normandy. That's near enough to thirty-five miles, though it's across sea (flat and relatively quiet).
@@arnenelson4495 thats hilarious i was justthinking nah that sounds like a german rocket which used pulse jets
That's an air compressor powered furnace heater... Every home with central heat has one of these.. a fan blowing air,, fuel mixed in and ignited... I made these from spray paint cans when I was about 9... They work better with propane and acetylene as a fuel mix
no moving parts!
To the commenters saying this isn't a ram jet. Yes it is indeed a ramjet but here's the catch it's fed with compressed air. Not a pulse jet as those generally sound quite different.
Technically a ram jet uses super fast air and the aerodynamics of a super sharp cone on the ram jets engine intake to compress itself, mix with fuel while superheated (being like mach2+ speeds) and then self igniting creating more thrust.
Just saying that ain't happening here
Ramjet vehicles operate around Mach 1-6, but the compressed airflow is subsonic at the point of ignition. Scramjets on the other hand operate anywhere from Mach 12-24 and the compressed air has supersonic velocity at point of ignition.
I had plans for what was called a pressure jet that ran on propane. Are we sure that's not what it is? It doesn't seem to be a ramjet because they usually won't start below 300 mph.
he is injecting compressed air with th second hoose
Это прямоточный пурвд.
Одноместный вертолёт Болдырева просто нуждается в этой движке!
1964год....🇷🇺🇺🇸
Roger Ramjet hes our man...
It's not a ram jet, it's a pulse jet like on the WW2 V1 flying bomb. For a ram jet to work you need forward motion to compress the incoming air.
"No moving parts" is not entirely true. Ram jets have reed valves that open and close on vacuum and compression.
.........WOW HE USED A BLOW TORCH TO MAKE A BIGGER BLOW TORCH
Pulse jet
Pulse jet, Ram jet, who cares. Its still violently impressive.
Walter white
Паяльную лампу показывает 🤣
WW2 German V1 Rocket technology.
no v1 was a pulse jet not a ram jet
lol
that is not a ram jet
It is a ramjet, but the combustion wasn't steady (perhaps because the high-pressure, high-discharge velocity air supply--which substituted for the high-velocity ram air the engine would use in flight--came out of the regulator in rapid pulses). If that engine had been a pulsejet, it would have been *far* louder, and the pulses--a rapid series of explosions--would have been very distinct and easily audible (and visible, in the exhaust plume flame).
Uh...you...uh can't run a stationary ram jet. Kinda in the name. You need some fairly high speed air through the engine to ignite it.
He has compressed air hooked up to the front to simulate air intake during high speeds. It's not representing mach 1 speeds though clearly
Hot damn! Missed that the first tim
@@TDPCMcpho
Ramjets work at subsonic. Scramjets work in supersonic. (sc = supersonic compressed)
@@TheMrMused Ramjets function most efficiently between mach 3-6 from what a quick google is saying. Ramjets may work subsonic but it sounds like you're implying they're not meant to work supersonic. which is incorrect. I think there's a misunderstanding here though, I was just responding to the comment, pointing out it wasn't still air
Crap
Руские это давно на коленке в гаражном масиве сделали ,вы отстали лет так на 20 . Это не новость .
У нас такими jetами поросят смалят ..... 😂😂😂
Bruh, thats a pulsejet
Much ado about nothing (subsonic on the ground - energy converted to eardrum destroying noise)
Yaaaaaawn 🥱 ,,,
You mean the jet engine that needs a constant torch blown on it to make it run
And a constant source of compressed air. Maybe "no moving parts" on that little tubular unit, but several in the compressor that filled the air tank. More like a rocket with gaseous oxygen as the oxidizer.
That might be a ramjet, but it’s kind of dumb to watch one stationary. It produces no thrust until it gets to very high speeds. Might as well just light a propane torch and say “hey, look at this”…🤦♂️
Is it practicle hr at collage
ПуВРД от него больше шуму чем тяги.
I want it!
Ah, air NZ.
A TRUE Ram Jet engine is a simplified engine in which forward accelerated velocity forces air into an intake at a given force, compressing it until it reaches the needed combustion temperature, thus creating a controlled reaction called thrust. A Pulse Jet requires much higher supersonic velocities to be able to function.
Thanks for posting. Cannot wait to see the other post.
Like a Pulse jet engine
It is a pulse jet engine
It is not a ramjet engine. A ramjet engine works only when the vehicle flies at twice or more than the speed of sound; and thus uses the shockwave phenomena as compressor for the air intake for the engine.
I assume the air from compressor give enough pressure air to make it work. The thing doesn't need to fly 300mph.
@@medtxastratospore5729 Ramjet by definition does not have moving parts.
@@NM-dl1gv I know. He use external air compressor, the model itself has no moving part.
You're describing a scramjet. Those require at least mach 1 to start. (sc = supersonic combustion)
Ramjets only work at subsonic, which this is - using the compressed air feed.
@@TheMrMused scramjet is supersonic combustion ramjet engine. RAM here is actually pointing to the process of compression by means of shockwave that can only occur during supersonic flight.