i had a APS 36, the bearings lasted 10 flights! i was told i was using the wrong fuel, Prosynth 5% not sommit with castor!!!!! like that would make a difference in 10 flights, 10 short flights, 4Oz tank in a fun fly
i have two Magnum 36's, both last about 10 months before they have to go back
the Magnum 15 is still good
the SC 15 was ok, wore out after faily good service, never worked right since the new piston conrod liner went in.
Irvine 36, good engine, lasted a long time
Leo 37 great engine, still going great
MVVS dosn't matter what size, all are bullet proof.
West, oooooooooooh i wet me self