Models- -crank the engine as hard as you can -then try various 2 blade props -- 3 blades will never hit same thrust -static/unloaded
makes no difference
these little buggers have to churn like crazy to get any results
I don't theorize - I fly em and now with my "on board rpm save" feature ignitions - I can read actual unloaded rpm in flight -
The old prop fighters from 60 years ago did the same thing - they flew em and used what was available and in rare cases they got a chance to see what really could improve things .
That usually happened afer WW11-- some of the Trophy racers swapped props and found more speed - but mainly they did the classic model fix - get rid of the weight - and/or add a bigger engine.
All of the theory points to that as being the best fix- and actual practice bears it out.