I have an atomic force motor and a wattage 30 amp speed controler and 1050 8cell MH bats. LHS told me to use a 9x6 prop but the controler cuts out after a few seconds of running full power. stuck an 8x4 prop, runs a few seconds longer but allso cuts out. Im trying to power a glider that has been running good on an OS .10 but I wana make this thing electric with good power with out spending to much.