The 20x10.5 APC has been working very well on the OS. This is the same prop guys are using on the YS175....

It needed slightly richer LS needle to improve the idle in flight. Transition is very good and all flying is basically done at half throttle, controlling speed. In low to moderate wind, I use about 10 ozs gas for two Masters flights back to back, around 15 minutes flying time. Also, got to fly the engine in 85F temps yesterday. No problem with cooling....it is continuing to impress.

The only thing better would be to have the same engine in a rear exhaust configuration