Mailing List flyrotary@lancaironline.net Message #50725
From: Al Gietzen <ALVentures@cox.net>
Subject: Tuned lengths
Date: Wed, 31 Mar 2010 20:46:16 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

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

 

 

Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster