Experimenting with differnt props. Have a Mocom 1816 on at the moment 39mm Dia (Its for IC really)But seems to suit the Graupner Neodym 700 BB ok . Had a 3 blade brass 40mm dia on it and worked ok to. Might increase voltage to 19.6v we will see. (Motor: Graupner Neodym 700BB) (ESC: Fusion Aquapower 280) (9/10)