Paul lamer wrote:

  Apparently they are reselling the AIXRO go kart engine from Germany.
  That is the one Bear used to fly over Everest

 It is but I think that it is a step up in the sense that it will be
 aircraft
 ready - such as altitude compensating fuel injection, reduction gearing
 for
 a prop, liquid cooling system etc.

 I was also wondering. There have been a lot of recent discussions on turbo
 compounding of the rotary engine to improve fuel consumption down to about
 0.35 lbs/hr/Hp (I can't recall the exact realistic target fuel consumption
 number).

 Would it make any sense to use something like the Rotron 25 Hp or 45 Hp
 engine as a developmental test bed to prove the technology, test various
 methods. The idea being this may be a cost effective development approach
 due to smaller component sizing etc.

 In rocket engine development this approach is taken all the time. It is
 typical to start testing with an engine that is about 1/10th to 1/5th the
 thrust. It saves a lot of money and allows the all important experience
 base
 on the system and components to develop at a much lower cost than jumping
 to
 the end goal.

 Aircraft engines are fairly scalable, yet rocket engines are generally
 considered to be non scalable for a variety of reasons, yet the small
 rocket
 engine approach works very well to get to the end game at the overall
 lowest
 cost and shortest time frame.

 Thoughts?

 Cheers,
 Brian

 Yes and no. For that size AIXRO engine the turbine gear box becomes
 pocket watch sized :) Also the AIXRO engine is quite expensive due to the
 euro
 to dollar ratio. One can find a running Mazda 12A for free almost.

 All you need is a turbo and a gear box. I'll loan a gear box and a turbo
 to the
 right person that can demonstrate the ability and where-with-all to
 complete
 it and test it on a dyno. Here are some pictures of what I have so far.

 Another possibility is obtain a blow down turbine from an R3350 TC
 and connect it to a three rotor. I am saving a 3 rotor for that
 possibility.
 Paul Carey in WA Aus almost did it.

 Paul Lamar

Paul, please forgive my ignorance.
Would the arrangement as sketched here work?
Turn the turbine 180 degrees, gets it out of the way of the induction
system.
Directs the exhaust down and aft.
Adjust the belt ratio as close to cruise rpm as possible.
Only the outer rim of the large aluminum cog wheel has to be bolted to the
flywheel outer rim. It would appear that a belt as wide as 1.5" can be
accommodated by a Tracy drive.
I do not know if the direction of rotation of the Mazda turbo would work.
In short I am way over my head, if this is not practicable please ignore it.
Milo


In theory yes. The small pulley must be one inch or smaller so the over all
gear reduction is at least 10:1. The large pulley must be checked for
adequate strength at 7500 RPM take off speed. Also the belt wants to fly off at
that diameter and speed. Looking at the output shaft end of a TO4 turbo changer it
rotates clockwise. Looking at the back (car) end of a rotary it rotates
counter clockwise. So from that point of view it won't work. Doug and I spent
days figuring out how to make it work. He is taking a different approach than
I did. I have a set of herringbone gears in there that reverse the rotation.

Paul Lamar