Turbojet Engine

[wasnt me]

so im thinking of having a go at making one of these monsters

turbojet engine

anyone have any experiance? any input would be great thanks

[VB-]

would be interesting to know how much thrust it really puts out. my mates brother in law has got a propper model aircraft jet engine, and he had it bolted to a big heavy wooden table (the kind that takes a few people to move), and he started to spool it up one day, got to about 15% throttle i think it was and it started moving the table.... with two big blokes at the front of it trying to stop it moving. theres some pretty serious shit out there in relatively small packages.... only question is how to mount a gearbox to the back of one lol

[wasnt me]

the one in the vid dont have a nozzle on. thats why its not making much thrust....

there is always the pulse jet option.... no moving parts at all

pulse jet

but id rather the sound of it spool up

[Bond]

I didnt make one myself but i got to stuff around and test one at uni in the dyno lab made from an old truck engine. Pretty cool fun and there is not much to them

[342Four]

...only question is how to mount a gearbox to the back of one lol

no need to

thrust is produced - pushing the object.....

[VB-]

no need to

thrust is produced - pushing the object.....

i was more reffering to fitting one into a bigger chassis to move people thrust isnt really a viable option for the street

[WHITER33GTS-T]

So where is the info how to make one of these?? I have a huge big turbo that would be fun to make into a jet engine.

[gumflapper]

that looks like fun

[Bond]

You can find instructions on the net. The outlet of the compressor is fed to the exhaust inlet, mixed with fuel and ignited.

[wasnt me]

You can find instructions on the net. The outlet of the compressor is fed to the exhaust inlet, mixed with fuel and ignited.

yeah have seen some instructions on the net seems easy to do....

outlet of compressor goes to a combustion chamber then to exhaust inlet. need to have a sprk plug in the combustion chamber

to ignite the LPG.

but need to know what sort of pressure is safe to run in the combustion chamber without blowing the turbo apart

and also what sort of oil pressure i would need to run for the turbo.. im thinking it would need a good oil cooler too.

i have read that you can get these things revving to about 130,000 prm

[VB-]

but need to know what sort of pressure is safe to run in the combustion chamber without blowing the turbo apart

and also what sort of oil pressure i would need to run for the turbo.. im thinking it would need a good oil cooler too.

i have read that you can get these things revving to about 130,000 prm

pretty thick cast iron with a gaping hold in the back of it (where dump pipe normally goes/where thrust is generated) i rkn you could get heaps of pressure in there no worries.

and turbos spin well past 100,000rpm on your car anyway, what you've mentioned isnt anything crazy

[wasnt me]

not too worried about making thrust atm wont to get one working with a good set up. then maybe strap it

to a go-kart.....

would be good to see what sort of power these things make.

[Boss-zilla]

not too worried about making thrust atm wont to get one working with a good set up. then maybe strap it

to a go-kart.....

would be good to see what sort of power these things make.

Like this?

[WHITE R32]

just dont try it with a ceramic turbo hey.....

[XRATED]

Well there are two main ways of doing it. You can connect a shaft directly to the rotating center of the jet turbine and feed it through a huge reduction gear or you can use the outbound trust to turn a "windmill" feeding a smaller reduction gear. The yachts I work on, some have jet turbines, they're great! little maintainance, produce masive amounts of HP in a very small package.... great for getting your 600gt 200+ft yacht to do 40+knots (and engine room fires!) and they run on straight diesel!

As for an automotive application, I would use it in conjunction with your piston engine. Use a "windmill" connected to a reduction grear, to an electromagnetic cluch arrangment, drive shaft, feeding a modified gearbox... hmm

Hell you could probably have a go at feeding the power to the front drive transfer case on a GTR gearbox... for a laugh!

Justin

would be interesting to know how much thrust it really puts out. my mates brother in law has got a propper model aircraft jet engine, and he had it bolted to a big heavy wooden table (the kind that takes a few people to move), and he started to spool it up one day, got to about 15% throttle i think it was and it started moving the table.... with two big blokes at the front of it trying to stop it moving. theres some pretty serious shit out there in relatively small packages.... only question is how to mount a gearbox to the back of one lol

Edited October 13, 2008 by XRATED

[VB-]

im not familiar with jet engines and jet turbines, i know they use one in the y2k jetbike, and they use em in helicopters and tanks n shit, just didnt know they were the same sorta thing, how do they do it in choppers and tanks and stuff?

[XRATED]

im not familiar with jet engines and jet turbines, i know they use one in the y2k jetbike, and they use em in helicopters and tanks n shit, just didnt know they were the same sorta thing, how do they do it in choppers and tanks and stuff?

I'm fairly shure the y2k was a direct shaft drive through a reduction gear (2 speeds- faster and stoopid fast) with some style of "buffer" or "slipper" clutch... Tanks are either multi geared (auto trans) direct drive, or hydraulic pumps and motors driven from the turbine and choppers are either direct drive or the turbine drives a generator that creates DC power to drive an electric motor coupled to the blades.

[VB-]

so how fast do these bigger motors spin? like in the y2k or in choppers/tanks? what about the diesel ones in the yatchs?

[XRATED]

so how fast do these bigger motors spin? like in the y2k or in choppers/tanks? what about the diesel ones in the yatchs?

18000-25000 rpm is the upper working range of the larger units I've worked with. Helicopters probably more... Y2K less.

[fr0st]

The hard thing is getting the flame holder right, you want it to burn all the fuel before the turbo but not blow out the flame when giving it some throttle.

Here's a good link for a really basic one - http://www.junkyardjet.com/primitive.html

And finally, a good use for a spare set of N1's