Jesse Hilton wrote:

I just found this site today.  I am building a Cozy IV
and plan on using a 600 hp 20b.  I would like a
sustained 400 hp cruise at altitude.  I am very
interested in your compound turbine ideas.  How far
along is this?

What psru would you recomend?  I have heard of
Geschwender, Ross and Barnett amoung others.

There is a company in New Zealand that produces 20b
aircraft engines rated up to 900hp.  Do you know
anything about them?  Their contact info on the web:

Rotary Engine Power, New Zealand
Contact: Grant S. Nicholls, 12 Aristoy Close, Conifer
Grove, Takanini, Auckland, New Zealand
Ph / Fax 64-9-2988848
E-Mail Address 105654.1753@compuserve.com or
gnicholls@compuserve.com

They also make aluminum housings that replace the cast
iron housings between rotors.

Any input would be appreciated.

Jesse

I don't know of any PSRU's that will accept 600 HP. Maybe they may last a 
short while for air racing purposes.  You will probably have to build
your own. Possibly out of Allison truck auto transmission planetary gear sets.

Also make sure you are using 3 mm wide steel apex seals. Check with Dave Lemon
at Mazdatrix for his experience with Mazda apex end seals. I think he has some
developed that will tolerate detonation.

We have a guy in Perth working on a 1500 HP three rotor turbo compound engine on here.
I am sure he will upload info as it becomes available. He is using a turbine from
an R3350 TC engine. A bit overkill and probably too heavy for your purposes.

You may have to find a large truck turbo and adapt it to turbo compound.

You will also have to design and build a high input RPM gear box for the
truck turbo turbine power take off. I recommend starting with a very small
pinion gear and large planetary and ring gears. Similar to the gear boxes found
in airliner APU's.

A very ambitious and costly  project all in all.
 
Paul Lamar
 
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