Dittos to everything that has been pointed out and I would just lke to add don,t bother falling into the trap of trying to decifer useful info from from manufacturers advertised power figures which are virtually useles in a real world.


One point on the stactic scale method it certainly can be usefull however this is only static thrust information so is not a totally accurate method either. It makes no account of how well the engine and prop combo unloads in flight and this a very important parameter.


Just as everyone has said the very best option is to use at or near the upper indicated engine limit That is suggested on virtually all model aircraft these days.

If you are trying to design your own airplane for your first glow aircraft then I would suggest you not attempt this untill you get some experiance under your belt.

John