so I have this OS Hyper 50 with the stock 60L Carb set up for a plane with an APC 11x8, and a GMS .47 oversize muffler, this muffler is about 1mm longer and 1mm wider than an OS 61FX stock muffler, see the muffler in the photo, sorry, but it's the only ohoto I have..
the engine had 2 gallons run threw it and I replaced the bearing and the ring, then I set it up for a plane, it has only had to flights on it and one take full running on the ground.

the Numbers
Prop APC 11X8,
fuel, mixed, 15% Nitro 18% oil,
Idle 3,200
Peak RPM,, 12,200
Tuned for flight,, 11,600

I have it in a World Models P-40, I plan to lean it out another 200 RPM after a few more flights, but as for now the guys at the field say the plane does about 100 MPH.. the thing is, when I order new fuel I will be ordering 20%, but the question is, what am I going to do with the 3 gallons of 30% I have




Jim