My F90 has the OS 1.08, and I don't think it's the ideal engine for this plane if you are trying to 3D it like Kyle does. It'll swing the 16-4 at about 10k, but it is slow to spool up in the midrange, making power adjustments sluggish and sloppy. For constant power settings or gradual changes in power, a 2 stroke is fine. If you need to make quick changes, such as during rolling harriers, you will be sorely disappointed with the 2 stroke's power curve and sluggishness. Keep in mind, I'm not talking about stumbling accelleration, just plain slow to adjust to the new rpm. Mine is obvious enough that I'm going to play with lighter props to try and reduce some of the flywheel effect.

By the way, i can fly for a full 20 minutes on a 14 oz tank and still taxi to the pit after landing. And that's flying hard, not just putting around.