Paul,

 I've been thinking about the limp home mode of the 13B.  I know
we try to design in redundancy, but say you end up with a dead
rotor due to a fuel or ignition problem.  Do you have any idea
how many hp would be absorbed in driving the dead rotar at 6k
rpm to overcome pumping/compression/friction losses?  I'm trying
to figure how many hp would be left to drive the prop in that
situation. And would peripheral vs side ports make a significant
difference?

Dan Stanzione

I don't know but having the throttle wide open would help
I think. What gets compressed de compresses and feeds the torque
back into the e-shaft. Friction is half of what a piston
engine is. BTW losing one rotor is like losing two cylinders
of a four cylinder piston engine.

Paul Lamar