does anyone have any suggestions as to what turbo to use on A
8400RPM, 350 hp, pump gas, 2 rotor? I would like to hold hp TO
18,000'  -JW

James Whitehurst.

It does not matter. The bigger the better. The large turbine will handle
the high exhaust heat better.  There are no requirements in aircraft engines
for rapid turbo spool up.

If it is over boosting despite the waste gate being wide open put a bleed hole
in the manifold. Or use 2 waste gates if you can't find one that is large
enough. That is even better as closing both will give you more boost at
high altitude. You can even use the excess compressed air to pressurize and
heat the cabin since you are designing and building your own aircraft.
18,000 feet is a piece of cake. Try for 30,000 or 35,000 feet.

Think how much money you can charge for a pressurized aircraft
that can cruise at 30,000 feet and go fast. That will beat most turbo props.

You will need an EFI system capable of controlling the boost with
one or more  waste gates. The Motec is expensive but it can do that.

Paul Lamar

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