Paul,

How much power can a 2-rotor make and still be considered reliable
enough for aircraft use? Is 300 hp the upper limit for a 2-rotor
supercharged, geared engine? How much would the engine weigh, roughly,
assuming a Crook gearbox and a blower weighing about 15 pounds?

Regards,

Gordon.

I really don't know. My guess is take off at 300 HP and
back off to 200 HP for cruise. Then you have the cooling
problem. 300 HP takes a heap of cooling.