I have just ordered three O.S. Engines:

• O.S. 1.20AX 4-stroke engine with pitts muffler.
• O.S. 0.91FX Supress III with muffler.
• OS. 0.61FX without muffler.

I am not sure what engine goes in what airplane yet, but by following the rule-of-thumb where 1 lbs of model requires 1/10 sq. inch of engine, I should be able to find a home for them.