[NSRCA-discussion] 90 size pattern plane

[Fred Huber]

Pitts muflers can be problematic.

Most are designed for loks rather than function.  If you have not dealt with 
them before do not use one on a pattern plane.

Typiclly I end up having to plug one exhaust tube almost completely (just 
leaving a 1/16 inch drilled hole to let oil out) and the other hole gets 
partially plugged. This is due to the Pitts style not having much if any 
backpressure.  They typically have double the exit diameter for each tube 
compared to the single outlet tube of a stock muffler.

You're better off using an exhaust extension and letting the standard 
muffler hang out in the slipstream if there's problems making the stock 
mufler clear the firewall.

NEVER break an engine in using a Pitts muffler.  You'll never know if its 
the muffler causing trouble or if the engine has problems.

----- Original Message ----- 
From: "Jim Alberico" <alberji at charter.net>
To: <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, July 14, 2007 3:17 PM
Subject: Re: [NSRCA-discussion] 90 size pattern plane


> Greetings.  I'm the club member mentioned by Ed.
>
> Jay Marshall's suggestion looks like a potential winner, the Hangar 9 
> Evolution 90 4D.  The SFG's are easily removable when not appropriate.
>
> Turns out the MA that just arrived mentions that model as a 
> beginner/practice choice.
>
> I'm guessing the recommended 2S Evolution 1.00 NX is plenty of power for a 
> beginner on a budget.   Thoughts?   Remember: (sportsman + beginner + 
> budget).  :-)
>
> Other threads seem to say the stock Evolution muffler will not fit.  A 
> Pitts muffler, such as from Bisson, is suggested.  Additional thoughts 
> from this community of experts will be appreciated.  Thanks!
>
> Jim
>
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