|
Post by frankenstein on Aug 2, 2016 22:52:50 GMT -5
Hey my name is moamen im from egy. Im new here. first i want to say thanks guy's for all who sharing all this experience. And really i like you so much guy's. But i have important question Why you dont use turbocharged engine in aircraft or ultralight for example?! And what different between turbocharged jet engine and all another jet engine's its only the thrust?! I mean you need alot of thrust to building ultralight?! Forgive my low English and thanks again
|
|
|
Post by jetjeff on Aug 3, 2016 0:34:26 GMT -5
Hi Moamen,
I've actually researched the idea of a turbojet powered ultralight, as it's one of my dreams of something to do in retirement. Here is what I've found.
It's been done, there are examples of the Cri-Cri (very small French designed ultralight) powered by two large model turbines and there is youtube video of a guy that flies a Mitchel wing with a JFS-100-13a converted to thrust. The American BD-5j used a french turbine (SNECMA?) that was very expensive, if you happen to have very deep pockets.
Some 'turbine experts' state that APU type turbines (Garret JFS-100, Solar, etc) aren't designed for continuous duty, and trusting your life to one would be foolhardy. Another item to consider is turbines are insatiable fuel consumers, and carrying enough fuel for a reasonably long flight would prove challenging.
Jeff
|
|
|
Post by frankenstein on Aug 3, 2016 1:34:41 GMT -5
Hi jeff
Yes Jeff i know eny (APU -Garret JFS-100, Solar, etc) will working in ultralight and mosquito helicopter and there are many projects but so hard to get it.
I watched video's for the Cri-Cri and i guess they not turbines but i still thinking 💠Why we can't use home made turbocharged jet engine in gyrocopter or ultralight or eny small aircraft?!
Moamen
|
|
|
Post by jetjeff on Aug 3, 2016 2:09:49 GMT -5
Hi Moamen, The 'standard' Cri-Cri is powered by two small piston engine two-strokes, but this one is turbine powered www.youtube.com/watch?v=1sfZJPEZP4EI guess you could use a homebuilt turbine to power an ultralight, but again, using such a turbine would be fine for land based vehicles like a kart, motorcycle, etc, but all bets would be off, once installed in an airplane. Jetbeetle is a company based in Taiwan that makes turbines in the 90, 150 and 250lb thrust range. Using their engine would raise the likelihood of you living long enough to see your grandkids, vs something homebuilt,,,lol. Jeff
|
|
|
Post by frankenstein on Aug 3, 2016 9:42:53 GMT -5
Hi jeff
Yes man i watched the standard Cri-Cri,i will try to use homebuilt turbine to powered gyrocopter but first i need to found a big turbocharged maybe i will get more thrust, if i crashed i will Carry you responsibility lol
Thanks jeff i following you from along time your big shark in turbines
Moamen
|
|
|
Post by jetjeff on Aug 5, 2016 4:15:41 GMT -5
Hi Moamen
Thanks, thats funny.
One item, I've never been able to find data on, is how must thrust the Rotax engine (the piston engine that powers most ultralights) produces. They are rated on shaft horsepower, not thrust. I'm guessing, you'd want a turbine with at least 120 lbs of thrust to get an ultralight off the ground.
Jeff
|
|
|
Post by racket on Aug 5, 2016 5:13:56 GMT -5
Hi Jeff
I think a rough thrust per horsepower would be ~5 lbs/hp , a lot will depend on the proposed aircraft max speed , the actual prop, rpm, pitch , diameter etc etc , I sorta remember having a conversation with a guy many years ago about the suitability of using my 110 lb thrust TV84 pure jet engine in an ultralight and he felt it might just be big enough in the right aircraft, ............LOL, I even went and had a look at a couple of second hand ultralights to see how it could be mounted so that nothing got burned.
There was a very nice scale Vampire jet that I felt was most suitable , but I needed more thrust, unfortunately 15 years ago there simply wasn't the parts available to make a more powerful engine which was a bummer :-(
I even had a guy chasing me for an engine for his BD5 kit plane as he couldn't source a suitable one here in Oz .............heh heh , every couple of years he'd ring me to see if I'd made progress on a bigger unit .
Cheers John
|
|