Mailing List flyrotary@lancaironline.net Message #50729
From: Yvon Cournoyer <geryvon@videotron.ca>
Subject: Re: [FlyRotary] Tuned lengths
Date: Thu, 01 Apr 2010 12:33:53 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Please post drawings/photos/specs...Yvon
----- Original Message -----
From: Al Gietzen
Sent: Thursday, April 01, 2010 12:46 AM
Subject: [FlyRotary] Tuned lengths

So let me just play devils advocate and throw this in here.

 

I designed my intake manifold to be compact, lightweight, and fit into the cowl without any contusions or bumps. I designed a compact tangential muffler, and a secondary muffler, for light weight and suppression of the noise. No effort to ‘tune’ on either end.

 

The result is that I get a very flat torque curve, and about 90 HP per rotor at 6300, using the 9.7 turbo rotors in a NA engine (actual dyno data).  It is also one of the quietest rotarys around and the exhaust system is still solid and sound after 180 hrs of operation.

 

No; I’m not bragging – and I don’t doubt that a few more HP could be squeezed out over a small rpm range with tuning. The point is simply – how much time and effort do you want to put into the misty netherland of tuning the intake and exhaust?  Maybe focus on lightweight and durable design.

 

Just a thought,

 

Al G

 

 

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