[NSRCA-discussion] OS 91FX or 120 AX for Focus sport

[Linda A. Carnes]

I agree with Mr. Shulman the stock muffler and tank forward works perfect.
For an out of the box setup.

 

However, we, in pattern, prefer a tank on the CG and we wish to use our
muffler of choice. Which can be difficult to obtain a smooth flight?

 

Therefore, the Perry pump provides consistent pressure regardless of RPM and
tank placement and without regards to muffler.

 

 When I left YS and went to OS in a Tai-Ji60 the Perry pump was the only
other addition.

 

In addition, just like OS engines. Set it once and forget.

 

Just have fun flying!

 

Got to Love OS and Perry Pumps!

 

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
Sent: Thursday, June 26, 2008 9:12 PM
To: bob at toprudder.com; 'General pattern discussion'
Subject: Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport

 

I had the same problem. I went to a Perry pump and all was OK. I had the
tank back as far as possible so that it wouldn't affect the CG as it
emptied.

 

Jay Marshall 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Bob Richards
Sent: Thursday, June 26, 2008 8:51 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport

 


Jason,

 

The reason I ask, I have the 120AX in a Venus II and with the stock muffler
I have a fuel draw problem. The tank is all the way against the back of the
firewall. If I adjust the mixture for max rpm with the nose pointed up, it
is blubbering rich in level flight. I was going to experiment with adding
more restriction at the exhaust outlet, but just stuck it on the rack and
have not touched it.

 

A couple of guys have that engine with the Jerry Smith style mousse can
mufflers, and they work great. They have much more back pressure but turn up
more rpms. The extra muffler pressure helps with the fuel draw.

 

Bob R

--- On Thu, 6/26/08, JShulman <jshulman at cfl.rr.com> wrote:

 

Stock muffler

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Bob Richards
Sent: Thursday, June 26, 2008 3:56 PM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] OS 91FX or 120 AX for Focus sport


What are you guys using for muffler/pipe on the 120AX?

 

 

 

 

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