OS 91 Pipe Settings

[JonLowe at aol.com]

In a message dated 12/11/2004 5:37:57 PM Central Standard Time, 
rcaerobob at cox.net writes:
Nope.  Just used OS as the header, figuring it would draw more info - NOT.  
Flew the Exc. today four flights.  VERY good airplane, but needs the 90 on a 
pipe, I'm sure.  Plus CG was nose heavy.  Report is on RCU.
    Anyone have pipes with 90's ????
   Bob.
I had a Quest with an ST S90K, with a Mueller header and a Macs quiet pipe.  
Would turn a 16x6 supersonic in the air on 15%, but the thing would go 
straight up forever.  Went to a 16x7 which quieted things down a little, but the 
plane was very fast, and still would pull straight up out of sight.  I ran the 
pipe with the stock Mueller header length. Unfortunately, I lost the airplane 
last weekend, and I never really measured anything or tached it. I was gong to 
try a 17x6 or a 16x4W to try to slow it down a little.  I will tell you that on 
the stock muffler, the engine was a dog, but the quiet pipe really woke it up. 
 Wasn't peaky, and had great mid-range with an OS-F plug and a Perry pump.  
The performance amazed people in my club.  I was amazed it would pull such a 
big prop.

Jon Lowe
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