I checked my 2/4 brison rpm to day. with a 20x10 prop it reads 6000 rpm. with a 18x10 it reads 7700 rpm. brison spects are prop size from 18x6 /18x10/20x10. is the 20x10 and 6000 rpm to much of a load on my 2/4; it flys good. the 18x10 and 7700 makes alot prop nois. need input.