There is so much wrong with this video I don't even know where to start. First, there are only two types of aircraft engines, piston and turbine. When a turbine is used to drive a propeller, it's called a turbo prop. When he is talking about turbo props, he shows pictures of a piston driven propeller aircraft (Cessna 41x), and piston engines are the most common type of engine used on propeller driven aircraft, not turbo props.

He mostly gets it right about turbo jets, except again, every aircraft he shows when talking about turbo jets uses a turbo fan (the F-15 and F-16 both use afterburning turbofan engines). They get their thrust from the hot expansion of exhaust gasses, but he gets it wrong with turbo fans, which get most of their thrust from the bypass air from the fan.

There is no conspiracy, no hidden technology. Just a fairly standard turbofan engine and some VTOL construction. Nothing fancy.

http://en.wikipedia.org/wiki/Williams_X-Jet

>> ^GeeSussFreeK:
>> ^potchi79:
So you start a pulse jet with a leaf blower?

Mostly yes, the idea behind most jets is to compress incoming air with fuel. No spark is needed as the compression causes heat. The problem is you need the air already moving to start. The same is true of turbofan engines of most jet airplanes. In my day they used electric motors to start the fan blade spinning. Once they are up to speed, they feed enough air fast enough into the combustion chambers to keep it going. A leave blower is a lot easier to add to a project then an electric motor. If you look up DIY jet engines in youtube, you will see it as the staple for home brew jet starters.
Jets are much more "simple" then combustion engines as they are mainly self sustaining when up to speed. They are very complex in other ways though, like how to not melt down under extreme heat and such. A flame out at low speed typically spells doom for a jet...engine restarts when careening downward is not as experience you want in life.
One thing I have never understood about a pulse jet is how to ramp your speed up. With a turbofan, you just up the fan speed or fan blade pitch...with a pulse just I have no idea. Add more fuel maybe? If that were the case, then the max speed would be dictated by the explosion maximum. If your explosion is to great, you risk vibration annihilation or destruction of your combustion chamber...or you spit the hot air out the back end before the pulse can bring it back for re-ignition? Or perhaps it has to do with pulse modulation and changing how long you wait till your open the valve. The longer you wait, the more thrust you get before the next cycle? Dunno, pulse jets were always more of a curiosity than an area of study.
Edit: Jets are very similar to diesel engine as there is no spark needed...all the heat is gained through compression. Hope that isn't TMI at this point


than

Though your knowledge of jets is impressive. Let's really try to stomp this sign of the internet generation out, shall we?! Who's with me!?

>> ^potchi79:
So you start a pulse jet with a leaf blower?


Mostly yes, the idea behind most jets is to compress incoming air with fuel. No spark is needed as the compression causes heat. The problem is you need the air already moving to start. The same is true of turbofan engines of most jet airplanes. In my day they used electric motors to start the fan blade spinning. Once they are up to speed, they feed enough air fast enough into the combustion chambers to keep it going. A leave blower is a lot easier to add to a project then an electric motor. If you look up DIY jet engines in youtube, you will see it as the staple for home brew jet starters.

Jets are much more "simple" than combustion engines as they are mainly self sustaining when up to speed. They are very complex in other ways though, like how to not melt down under extreme heat and such. A flame out at low speed typically spells doom for a jet...engine restarts when careening downward is not as experience you want in life.

One thing I have never understood about a pulse jet is how to ramp your speed up. With a turbofan, you just up the fan speed or fan blade pitch...with a pulse jet I have no idea. Add more fuel maybe? If that were the case, then the max speed would be dictated by the explosion maximum. If your explosion is to great, you risk vibration annihilation or destruction of your combustion chamber...or you spit the hot air out the back end before the pulse can bring it back for re-ignition? Or perhaps it has to do with pulse modulation and changing how long you wait till your open the valve. The longer you wait, the more thrust you get before the next cycle? Dunno, pulse jets were always more of a curiosity than an area of study.

Edit: Jets are very similar to diesel engine as there is no spark needed...all the heat is gained through compression. Hope that isn't TMI at this point

While this is a great description of a High Bypass, Low Compression engine, or turbofan it is not the only kind of jet engine. The other kind of engine is a turbojet engine, which is High Compression, Low Bypass and developes its thrust from combustion rather than the fan section.

I work on turbojets, so I'm partial to those.