Dear Paul,

Thank you very much for all you have written on the subject of the 13b & 20b
for aviation.

I would like two 20b engines for use in aviation. I need 300 hp for take
off, 225 hp for cruise climb to 30,000 ft and 200 hp for cruise thereafter.

I am most interested to hear whether you managed to turbo compound a motor
and if you have any information I am interested in trying it out. 0.324 BFSC
is certainly an attractive goal. May I ask also is there any way of
injecting water without creating back pressure to increase boost from the
exhaust?

Finally, do you have any idea what an all aluminium  four rotor system would
weigh? I am considering joining two 13b motors to create a four rotor motor.
I want it to run at 400 hp for takeoff and 300 continuous. Do you think this
goal is achievable?


Regards
Nick

The water injection in the exhaust sounds very very interesting.
Basically that is rocket science :)

Water expands to steam 1,600 times. Vol of H2O + heat = Vol X 1600 (in steam)
God knows the rotary has plenty of heat in the exhaust.

Not yet on the turbo compound. I am looking for a used DD15 turbo compound
system to mate to a 3 rotor.

My guess on the all alloy 4 rotor would be about 400 pounds.
690 HP at 9,000 RPM NA. Excellent power to weight ratio with half the
fuel burn of a gas turbine.

Paul Lamar

Very very interesting.  Hmmmm....

Chris Cosman

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