Paul,

Yes this picture of axial impulse turbine picture is what got me jazzed
about T.C. in the first place. How to isolate the heat from the end housing
and gearbox would be a challenge.  We are talking over 1650 degrees here
right? Put on the other end, isolated, with double walled housing and water cooled shaft it might be doable.  Space  might then be the problem.

Hence we start testing with a less efficient but more compact centrifugal
turbine.  Perhaps as Matt suggested once we have some data we can order up a smaller axial turbine.

Reeves,

I did save your 10/2004 note but missed the significance of it.  Thanks for re-sending it.  I am curious as to your thoughts if the same increase in efficiency would happen at high altitude by engaging an Rotrex traction driven supercharger (running off of the front engine belt)  and devoting the exhaust driven turbine solely to the function of turbo compounding?

You mention the T0-4 Garret group of turbines is good but for 300hp turbo
normalizing I believe  Tom Parks is using a T0-6. Better??  In addition my brother and other A & Ps have recommending RaJay units as a bullet proof devices.  I understand RaJay have been owned by everyone including Garrett at one time or other. I completely agree with you on using made-for-aviation-turbos however.  In the bench test phase cheap auto turbos can provide some serious data in the preliminary tests.

Doug Fir

-----------------------------
Paul,

It looked interesting before, it still looks interesting maybe even more
so.
It appears it would work, how well would it work?  your best guess will do. What is the cost guesstimate of doing this ? It does appear to have advantages at least in terms of simplicity. May be some sort of air flow through fins between the engine and the turbine unit would solve the possible heat issue just to try and keep it simple. Only a thought. otherwise maybe a water barrier of some sort connected to the cooling system via the water heater ports, yes there is a heat impact but it should not be OTT.

Regards David

One of your countrymen Paul Carey obtained
a air cooled blade turbine from an R3350 tubo compound
radial engine. This turbine generated 300 HP when
fed from six cylinders of the 18 of the R3350. He lived in
Perth but he gave up on the project.

Paul Lamar ...No rotor no motor.

Paul,
Might be an application for a large diameter Tesla turbine direct mounted to
the front of the E shaft. No hard facts on output or efficiency, but costs
may be lower than a special impulse wheel. There appears to be some
development work on Tesla turbines at the moment, but we may have to wait for
some results.

Colin Smith


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