scratch

Pyro · Post by **Pyro** » Fri Feb 15, 2008 12:21 am

I am new to jet engines. I am building a axial compressor engine and am having trouble getting the air fuel mixture right. I am using propane for fuel. I can get it to sustain a good burn inside but not enough heat to turn the turbine past a couple of hundred rpm's. I have scratch built the entire thing less the tubes and bearings. I didn't take too much time on the whole build. I know there is a lot of science in the build but they work on a simple theory. Does anyone have any pics that I could reference or any helpful hints. thanx

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 1:04 am

Hi Pyro

We'll need more info and preferably some pics, to see whats wrong :-))

They might work on a simply principal , but they do need a LOT of science if you want it to run .

Cheers
John

Pyro · Post by **Pyro** » Fri Feb 15, 2008 2:00 am

While I am looking for the usb cable for my cam I will say I have a 4 inch dia. outer housing 3 inch flame holder all 11.75 inch long it is very primitive as compared to everything I have seen here. I am starting to feel scared and inferior after reading some of the posts as some of the minor things I might of overlooked.

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 2:53 am

Hi Pyro

LOL...We all started somewhere , and it can take a few trials and errors before we get where we want to be .

Cheers
John

Pyro · Post by **Pyro** » Fri Feb 15, 2008 3:20 am

Thanx for the support. I am not sure where I want to be yet I have had more than a few errors but I am having fun with it. I have more experience in rocketry I can do some crazy things with rocket propulsion. jets are new and exciting.

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 4:10 am

Hi Pyro

Yeh , jets are more complex , you never run out of things to learn :-))

Cheers
John

Pyro · Post by **Pyro** » Fri Feb 15, 2008 4:27 am

OK I found my cables, my pics will be up in a min.

Pyro · Post by **Pyro** » Fri Feb 15, 2008 4:57 am

here are some pics of my pile of rubbish.

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 5:14 am

Hi Pyro

Bummer , my computor won't let me download pics from the Site :-((

Cheers
John

Pyro · Post by **Pyro** » Fri Feb 15, 2008 5:17 am

sorry having trouble with this pile of schitte i am using as a computer. The rest of the pics are here. first is the propane injection, then is the combustor horizontal then vertical, then the homemade ngv, which was the compressor before I researched and found that it wouldnt work so I flattened it out and rebent it. which is a little rough but it seems to work, then looking at the end of the turbine that is made of 3/16 stainless cut and hand bent using my mill rotary table as a guide for the angles.

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 6:59 am

Hi Pyro

Finally got them downloaded :-))

Sorry to tell you, this but theres no way she's gunna work :-((

Component efficiency levels will be too low for it to be able to self sustain .

Suggest getting hold of a turbocharger and fit a lube system and combustor , details of others engines on the site here or try over at Yahoo Groups ....DIY Gas Turbines for more inspiration :-))

http://tech.groups.yahoo.com/group/DIYGasTurbines/

Cheers
John

Pyro · Post by **Pyro** » Fri Feb 15, 2008 7:47 am

thanx for the heads up, and the honesty. I was trying to come up with something that didnt need a lot of technicality. I have a lathe and a mill, so I could do one by the book, but I was experimenting.

Pyro · Post by **Pyro** » Fri Feb 15, 2008 8:32 am

you say that it won't run without even seeing the compressor, can you tell me what I can change to make it run. I am all ears even if its the whole design. Its my first one that I have actually built, I have drawn a hundred and rendered even more.

racketmotorman · Post by **racketmotorman** » Fri Feb 15, 2008 8:59 pm

Hi Pyro

After 18 years of playing with turbines .........

http://www.racketmotorman.turbinebuilder.com/

I'm starting to get a reasonable feel for whats required to make them work .

May I suggest you get a couple of books on the subject of homebuilt turbines .................

https://sslrelay.com/s84068217.oneandon ... shopscript

The one with the yellow cover , third from the top of the page is probably the best , written by Thomas Kamps

Cheers
John

Pyro · Post by **Pyro** » Sun Feb 17, 2008 2:36 am

thanks i'll check them out