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As some of you know I started flying my RV-7A with
a cut - off Renesis intake manifold. In 2009 I installed an new intake
designed to route pressure waves from the closing of rotor #1's
intake into rotor #2 just before rotor #2's intake closed. After
using the new intake for over a year I am still very happy with it's
performance.
I gained about 15 mph TAS at the same altitude and
manifold pressure
My static engine rpm increased 300 to 350
rpm.
My takeoffs are faster and shorter with noticeable
increase in acceleration
My climb rate increased
My oil and water cooling is more critical now
because I make more HP.
But - I must confess I don't believe the manifold
can be reproduced economically. It's just too complicated.
I also believe it should have slightly shorter
intake runners to increase the performance at higher RPM. Decreasing the
intake runner length probably would require complete new geometry of the
system.
I have another concept for designing a
Renesis intake that using a reflected wave from Rotor #1 returning to Rotor
#1 .
I believe it would be much easier to build and
small enough to fit into the James rotorary cowl but because my intake works
well I am not moving ahead with completing the design and building
it.
Dennis Haverlah
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