[NSRCA-discussion] 90 size pattern plane

[Fred Huber]

You might consider the Magnum 120 4-stroke also.

Near the price of the OS .91 FX.  My Magnum .91 4-strok is giving eual 
performance to my OS .91 FS-II

----- Original Message ----- 
From: "Jim Alberico" <alberji at charter.net>
To: "'NSRCA Mailing List'" <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, July 14, 2007 9:09 PM
Subject: Re: [NSRCA-discussion] 90 size pattern plane


> 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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>>
>>
>>
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