I'm pretty close to finishing my plane, just getting the paperwork
assembled for
 registration and then inspection.

 I was up working on it when one of the other tennants stopped by to
compliment me on the
 looks of the metal cowl. He said it looked really nice with a cowl like
that, but that it
 should sound more "Macho". He said it was too quiet, when I'm running it
all he can hear
 is the fan in front.

 It's got 2" diameter pipes into a "y" 32 inches back from the exhaust
ports, then into a
 Hushpower muffler and then out to the side and bottom under the wing. It
has the  jspec
 13BREW motor with no exhaust port baffles.

 The prop is a Catto 74" dia x 88" pitch.

 Brian Trubee

 I wish there was a way to lower the tone. I am thinking hard on that
 problem.

 Paul Lamar


5000 W stereo and speakers? :)

Are you still running twin turbo's?  Just wondering with the 13BREW comment.

Tom

Brian's airplane is NA Tom.

Paul Lamar


It seems like separate stacks, one from each rotor, pointed in
different directions would lower the tone.  It would certainly lower
the frequency of the output pulses.

Then again, I'm not convinced it would be an improvement to lower the
tone.  My opinion is that people aren't used to the sound.  Making it
more big-fart Continental/Lycoming-like isn't better, just familiar.
I think we need to get more people exposed to the smooth and powerful
sound of not reciprocating..

I do think it would be better for the engine to not sound like a two
stroke, which I think some people may unfortunately associate with the
Wankel.


Matt-

I'm pleased with the way it sounds now,  people come out of the woodwork to
see what type of plane is making those engine sounds. That's not a bad
thing. If I wanted it louder, or perhaps try to reduce the exhaust
backpressure, there is a slightly shorter hushpower muffler available. It
remains to be seen how much power this engine makes, but I believe it is
slightly upwards of 190 HP.

Brian Trubee

We can get a 300 watt amp and a speaker and play back recorded sounds of
Lycomings :)

Paul Lamar



It might be sort of like the scenes from Airplane! the movie where the
707 sounds like WWII vintage aircraft..  ;)


Matt-