Paul,
In my research, I found this patent on a Rensis rotary that has been
modified for higher torque @ lower rpm than is usual for a Rensis.
Although it is for a marine engine, information is power.  The patent
link is below. I hope that this can help some one in the group.

John F.


It's just an application. I would be surprised if the US patent
office granted a patent on a turbo charged RX8 engine adapted
to a boat engine :) It's the Government so I won't be that surprised.
All turbo chargers increase the torque.

Paul Lamar


But still, according to those numbers you get 275 ftlb. At 200 HP and
4000rpm.  That swings a pretty big prop, no?
John Fair

That is still too fast for an efficient prop. You need a lot of HP
at 2700 RPM to swing a reasonable size prop. What happens is you wind
up with low MPG. Gear boxes are up to 98% effeicent while it is very
easy to drop
prop efficiency from 85% to 75% by reducing the diameter from say 5 feet
to 4 feet. That is a lot of wasted HP and fuel.

What do you have against gear boxes?

Turbo's are also heavy and they are under a lot of heat stress.

Paul Lamar

Some of my best friends have been gear boxes...

John Fair AKA Decker, Michael :)

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