"Glen A. Renken" wrote:

What is the realistic horsepower of a 13B ?  What about a 20B ( 3-rotor ??)  Will a Ross PSRU for a 13B fit a 20B ?

Anything from 160 HP to 270 HP.

For a normally aspirated 13B it is highly dependent on the intake manifold design
and the gear ratio of the PSRU. The gear ratio limits the engine RPM and the HP because 
most props are limited to about 2700 RPM. 

Side port engines are limited to about 200 HP except for the high power version
of the RX8 engine and peripheral port engines are limited to about 270 HP.

Turbo charged engines can be anything up to about 400 HP.

Just be aware that the cooling system must be designed for the HP used.
That is probably a more practical limit on HP than anything else.

The engine itself is extremely robust and does not fail in the
hand grenade mode common with souped up piston engines.
In drag racing form turbo charged 13Bs generate up to 800 HP.

20B are 50% more for any given configuration.

In aircraft use nobody has worn one out yet.

Paul Lamar

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