flyrotary@lancaironline.net Mailing List Archive

Richard,

Driving down the road observing mufflers. (got to get a life) I have noticed some cars with two small pipe exiting the muffler. I wonder what effect this would have on sound and rpm's verses one small pipe or one large pipe?

Bobby

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Richard Sohn
Sent: Monday, February 27, 2006 7:18 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhaust Blowout

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

From: Steve Thomas

To: Rotary motors in aircraft

Sent: Monday, February 27, 2006 11:04 AM

Subject: [FlyRotary] Re: Exhaust Blowout

On Feb 27, 2006, at 1:02 PM, Richard Sohn wrote:

----- 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

Richard, do you have any photos?

Best Regards,

Steve Thomas

SteveT.Net

Yes.

Richard Sohn
N-2071U