Has anyone tried the 16X4 standard apc prop? I just wonder if it would spin in the mid 9000 range with that prop.. I'm starting to think that the only advantage with the 125 is that it may spool up faster than the 100 and it drinks less fuel. Given that 30% nitro is $34 in my area, using less fuel is very nice.

I noticed that the OS 120 four stroke produces 1.9hp and spins a 16X6 apc at around 8800-9000 (per other threads on the OS engine).. This makes me think... If an similar sized OS engine can spin the same prop at the same rpm as the Saito 125, and the Satio 100 can spin at the same, then AM I CRAZY, but where is the 2.2hp going. The OS 120 only produces 1.9hp and the satio 100 produces 1.8.. This is starting to make me wonder if the the hp rating on the 125 is wrong.