[NSRCA-discussion] 90 size pattern plane

[Jim Alberico]

Thanks, Fred.

Lots of good tips.  I've absolutely no experience with Pitts-style mufflers,
so I never would have expected problems.

I took the earlier O.S. suggestion to heart, as I've had good experience
with 'em.  At the moment, I'm considering a slight budget stretch to the 120
AX over the 91 FX.  It's supposed to have appx the same footprint of the 91,
and comes with a muffler extension and a 90-deg adapter for it (probably
won't need).  I've read several positives about this engine powering the
Showtime. 

I'm not sure of all the practical implications of FX vs AX, but I see the FX
has a much, much higher RPM spec.  

Nothing is ordered yet, so anything is still possible.

Right now, I'm leaning toward the Showtime for several reasons, and it looks
like one of the O.S.'s.

Jim
 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Fred Huber
Sent: Saturday, July 14, 2007 8:00 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] 90 size pattern plane

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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