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What is the proper height to run a chopper below the pad( center of prop shaft to bottom of pad)?
I am running now 3.5 inches from bottom of pad to center of prop shaft wit a 10.25 x 18p chopper,turning 5800rpms. If I try to come up to 3 inches below pad it just blows out. Do you think a larger dia prop would be better?
on what boat?
its a home made 14' semi V aluminium hull with a 14" pad (weight of hull withhydraulic jack plate 450,motor 204 )
hi mate i've run a few choppers on my slt boat ,but its a tunnel hull .
dose your motor ventilate getting on plane?or dose it ventilate at full noise?
if its struggling to get out of the hole ,you can drill a couple 1 inch hole in your gearbox to relieve the exhaust .it will jump on plane after that,but your motor "will be very loud".
i have run ron's choppers and the merc small hub old style and chopper 2 to max where my motor stops pumping water and they still bite at that height.
cupping it will help but if you go to far it kills it.
There is no "proper" height as long as there's no water starvation. If you want to go faster try a cleaver. What's your current speed at WOT ?