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 know 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
If you get really serious /silly on HP; RX7 Specialties in Calgary, Alberta,
Canada has a two piece wide aluminum housing for building 3 and 4 rotor
engines. Combine with Racing Beat aluminum end and center housings.
I still think a Renesis p-port with the DD15 turbo compound would give the
power requested. You might need a waste gate around the turbo to keep boost
down and then close it for turbo normalize. Exhaust still goes through the
power recovery turbine at all times. A p-port Renesis is 250 HP NA. Mild boost
of only a couple of pounds would put it over the 300HP figure. Aluminum 13B
from an RX7 and the DD15 gives the same result with higher exhaust temps but
lower weight. A consideration as the DD15 parts will be heavy. One rotor less
with the power you want.
Dale Davies
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