Hello Paul,
My name is John Bell and I live in Maryville, TN. I am building a Velocity aircraft
and will be installing a 20B rotary engine. I am interested in getting info on intake
manifolds for my installation. I will be using Tracy Crook's electronic fuel
injection controller and want to use two injectors per rotor chamber. Is there
anything yet available that will help? I saw you were working on a 13B intake and was
hoping there may be one also available for the 20B three-rotor, or that the 13B molds
could be modified for the 20B application. Any help you could send my way is greatly
appreciated. Thanks much!
John Bell
Hi John,
There are several ways to go.
A: You can build your own out of aluminum tubing.
B: You can fabricate one out of composites and high temp
epoxy using bicycle inner tubes filled with sand as
a male mold. As shown in this jpg I took of Bernie Kerr's
manifold at Sun & Fun this year. These are a bit long.
Make them in the range of 16 to 20 inches long assuming
you are using a 2.85:1 gear box from Tracy.
C: For the most power see the ACRE NL web site and
build a P-port intake manifold.
http://www.rotaryeng.net/intake.html
This is what we are currently focused on to get the
most amount of power possible. You might not need 375 to 400 HP
for takeoff and climb but at high altitudes it will
give you the most power you can get without a turbo
or supercharger.
D: The Velocity XL might have room for a stock 20B intake manifold.
Paul Lamar
Thanks Paul. I will do some measuring...
My kit wont arrive until January, so I have a little time left to plan. I am building
the SE, so it will be a little tighter than in the XL. I want to run lower power
settings and still want over 200 hp without turbocharging so I am thinking about the
20 instead of the 13B. A mild street port should give me better seal support (I am a
little concerned about over-porting's effect on engine life). I will use the RD-1B so
2.85 will be my ratio.
Thanks again and I hope to talk with you soon,
John
Mild street port is the way to go with a side port engine.
Nobody has worn a rotary out yet in aicraft service.
As far as we can tell you will get at least 2000 Hours.
Usually the problems have been fuel and water plumbing.
Don't cut corners with the plumbing.
Paul Lamar
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