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Speed,Combat,Scale,Racing => Speed Talk => Topic started by: Ken Burdick on November 28, 2017, 04:01:34 PM

Title: exhaust extension in Perky
Post by: Ken Burdick on November 28, 2017, 04:01:34 PM

I may have found a way to get a reflective wave to travel back up a straight pipe. Since this is an "extension" like a mini pipe, is it legal in Perky?

Title: Re: exhaust extension in Perky
Post by: C.T. Schaefer on November 28, 2017, 05:04:20 PM

I define mini pipe as a constant diameter from one end to the other. But....... I did not make the rules.  TS

Title: Re: exhaust extension in Perky
Post by: Dave Edwards on November 28, 2017, 06:09:49 PM

And I have some long, skinny f2d mufflers that add a few rpm, are these ok? Seems open to interpretation and maybe we should tighten up the rules to eliminate any extensions/mufflers/pipes???

Title: Re: exhaust extension in Perky
Post by: Al Ferraro on November 28, 2017, 08:25:19 PM

From the AMA website.
A minipipe cannot be longer than six inches from the centerline of the engine bore to the end of pipe. The inside diameter of the pipe shall be of constant size.
Mufflers are legal in Perky.
Al

Title: Re: exhaust extension in Perky
Post by: Paul Smith on November 28, 2017, 09:01:25 PM

per NASS Perky rules.

7. No Tuned Pipes or Megaphone exhaust extensions allowed. Mini
Pipes and Mufflers are ok.

Title: Re: exhaust extension in Perky
Post by: Ken Burdick on November 29, 2017, 08:46:14 AM

so it's legal.

Thanks!

Title: Re: exhaust extension in Perky
Post by: Russell Shaffer on November 29, 2017, 04:05:08 PM

Hey Ken.  Will it work on a LA25?

Title: Re: exhaust extension in Perky
Post by: Paul Smith on November 29, 2017, 06:51:20 PM

All depends on what you call "work".  If it reduces noise or gets the exhaust out of the airplane, it works OK.

If it enhances power, then it's a tuned pipe and thus illegal.