flyrotary@lancaironline.net Mailing List Archive

Dennis,

I worked on the speed of sound ( same principle) for the 44mm at 6,000rpm. I took the distance from the inside of the rotor housing to the inlet plenum. The wave is also reflected as the sound wave reverses when it hits the end of the inlet tube. Yours might be enhanced somewhat, using the closing opposite port . I don't know which system is better. You have to get optimum length first go with your system, whereas a straight system can be tuned by having a trombone style tube ending for fine tuning to the desired RPM. What we need is a trombone style that is adjustable.

George ( down under)

Geroge & Bill

The 44 inches is calculated based on the distance a reflected wave (traveling at the speed of sound) will travel during the time between the closing of rotor #1 intake (wave created) to the when the intake on rotor #2 is about 50 % closed. My intake design uses 1 3/8 OD x 1 1/4 ID aluminum tubing purchased from Performance Tubing. The curves in the intake are designed to carry the sound wave from one rotor intake to the other intake while operating at 6200 rpm. Air is fed into the tubes at the center where the rectangular section is located. The large intake with the TB is 3 in. aluminum.

The first picture is the intake as installed on my airplane - the second picture is a top view during construction - I built a wooden fixture to hold everything together and assist in welding. The manifold flange is cut out of a 4 port Renesis intake. The third picture shows the bottom piece of the intake in the fixture and the top half resting on the top of the fixture. I have other pictures of the internal parts if you need them.

Bill, do you have any ideas on how to build multiple copies of it?

Dennis H.

George Lendich wrote:

Bryan,

I missed where the 43" came from, however from my calculations for 44mm inlet tube, my calculations came to 21.36". That's for a straight tube inlet manifold. That's interesting isn't it.

George (down under)

This is hard for me to visualize as well. Perhaps if you get a chance, you could snap a picture from the top.

Did you get 43 in. from #1 secondary to #2 secondary?

Bryan

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bill Bradburry
Sent: Monday, February 15, 2010 11:29 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo

Dennis,

I just looked at your picture again…the secondary look much longer than the primaries. It may be an optical illusion??? I bet you mean 1 1/8 id??

Bill B

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dennis Haverlah
Sent: Monday, February 15, 2010 11:03 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: rpm vs Power was : Throttle limits was Re: N.A. Renesis to turbo

All my tubes are the same length and the same diameters. I can check but I think they were 1 1/4 id. and 1 1/4 od.

Bill Bradburry wrote:

Dennis,

Aren’t your primary and secondary tubes different lengths from rotor face to rotor face? If so, what are the two lengths? Are they different diameters?

Bill B

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