"stol" wrote:

My same package is at 434 lbs and can be configured to put out
from 120 hp all the way to 600+. The 600 number is for takeoff and
five minutes, then you have to throttle it back to the the low 5's to
get it to live.

Getting an honest 600 horsepower from a 347 cubic inch engine would
require doing things to it that would seem to be quite incompatible
with service in an aircraft. Approaching 2 horsepower per cubic inch
requires either significant turbo/supercharger boost and/or turning
the engine at VERY high rpms.

Have you actually dyno'd the engine to check the realistic horsepower?
400 would probably be enough to do VTOL on a CH801... ;-)

Mark Hickey