Hey Guys,
Can any body tell me if my engine was running at lets say for example 15,000 RPMs on the ground, what would it lend out to in the air while racing the course.
Do engines lend out quite a bit in the air or not, do the RPMs change in the air massively.

There are lots of variables to consider. Drag profile of the airplane, prop, exhaust and nitro content will all influence how much your engine will unload and RPM increase.

So with 10% nitro content & a coposite air frame with no drag, would the engine lend out another 2,000 RPMs or less than that!!