Hi Brooke,

I'm certainly not an expert in this area, so I'm sure others will chip in.

An important factor is the prop you put on your engine, also you have to take into consideration that once airborn the engine will probably run ~1000rpm more then on the ground (this is what I am told, please correct me if I'm wrong).

I have an OS .40LA with 11x5 prop and a Webra .60 with a 13x6 prop and both run around 10200 on the ground.

Johan