I posted this Info in another thread so it may be worth posting here. We have 3 GP Pitts flying at our club, all with different engines. One a G-62, one a ZDZ 50 and the last with an OS 4 cylinder, 4 cycle engine. They all fly pretty well with the G-62 powered one flying a little heavier than the other two.. All things considered though, they do fly pretty much all the same.. Regards BobH.