Jarrett,
If you want to build an intake manifold, I
suggest you build one that works well like the one Dennis came up with or if he
has a better idea now, try it.
See the attached msg.
I believe that you would have to build
this for $500 or so to sell many and it would require at least 3 iterations, 13B,
Renesis, and 20B. I assume all the early 13B intakes are the same???
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Dennis Havarlah
Sent: Wednesday, November 10, 2010
3:27 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Improved
performance of my new (2009) intake manifold
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 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.