----- Original Message -----

From: al p wick

To: Rotary motors in aircraft

Sent: Monday, February 27, 2006 8:23 AM

Subject: [FlyRotary] Re: Exhaust Blowout

 

 

I'm not all that familiar with rotary characteristics. Puzzled why tail pipe is such large diameter (2 pipes seam welded together). I would think that exhaust pulse at any one moment is no greater than a single tube diameter. Maybe someone can explain to me.

 

-al wick

Al,

 

It seems you are right with the pipe sizes. We did a test at the last Shady Bend meet. A small resonator box from Monty and added a 1 1/2" exit pipe. The result(regarding noise), also subjective, was amazing, and the engine lost only 200RPM at the top end.

 

Richard Sohn
N-2071U