Mr Paul Lamar

I was reading your article in rotaryeng .net and saw you had a
link to a news letter. I would like to subscribe if you are
still sending. I would also like to ask you a question on the
rotary engine we have installed in our aircraft. It is a six
port intake 2006 renisis motor. We modified the intake and the
exhaust to fit in the cowling which has resulted in a
significant loss in horse power. We did not put in a tuned
exhaust as you described. Could the three ports on each rotor
be connected to a single 2.5 inch pipe and a slide throttle
fabricated for each rotor as you did for the p-port system you
described in the paper you wrote, then attach two  18 to 22 2.5
inch pipes to the filter at the intake ?  You are probably very
busy but if you could give some guidance it would be
appreciated.

Regards Keith A. Clayton

Send me some pictures of the engine and I can make some
suggestions for a better intake manifold. The HP of a rotary is
all about the intake system. What kind of airplane is it.

Paul Lamar

Here are some pictures.
Keith A. Clayton


Assuming that you have a 2.85:1 gear box the intake runners
need to be about 18 inches long.  That will give about 200 HP
at 7500 RPM or so. The rotary likes to rev.  The smooth transitions
from oval ports to round tubes is important.

More on this in the next message

Longer if a 2.17:1 gear box. In the second case HP will
be 160 to 180.


Paul Lamar

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