----- Original Message -----
Sent: Thursday, April 21, 2011 5:53
PM
Subject: [FlyRotary] Re: FW: [FlyRotary]
Improved performance of my new (2009) intake manifold
Bill that is a pretty wild looking manifold! I can see that it was intended
to benifit from DIE? I've been leaning more towards a close fitting 'over the
top' manifold
which would be usable for either pusher or tractor installs, however it
would be somewhat simpler than the pictured unit. It would take alot of
'study' and prep work to
get a cast unit in that configuration. More than likely it would need to be
hand fab'd and welded [same as what is pictured]. This is 'doable' but the
added cost of getting
all those parts together and into a working unit, would push the cost up
past the 'reasonable' level. At least as far as i can tell from a your
picture. Of course I could be seeing
more complexity there than actually exists. However, that being said I'm
open to all options and suggestions on how it could be made to work! :)
Best regards
Jarrett Johnson
www.innovention-tech.com
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.
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