Just came in (sorry for sidetracking this post a secon..)

OS-50FSR Heli version (circa 1970's)
Bisson STrap-on muffler for my G-90 :0
9x8 APC
15% Omega
Unknown old idle-bar plug
1,500 ASL
70 Deg.

Turned a very respectable 15.4K

I have never tried 15% in my Morris/Rossi's --- Maybe with a head shim it'd be okay- I run 5% in the Rossi, Webra, Irvine's, and my K&B-48 (not required)

The Rossi and a brand new Screamin'48 are on my dresser
the Webra is in my "Airgar" Patriot ARF, and the OS-50SX is in my other Patriot, I am running a Tower muffler on the SX and the prop. is the one you trimmed for me at El Mirage (for the Whip. remember?) it is about a 9.5x8 APC---

My shed was leaking everywhere so my airplanes are the shower (Most of 'em anyway)

Cheers!