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Author	Topic:   Formula for height vs. setback
R T M	posted 06-09-2009 06:29 PM ET (US)      Anyone remember the formula for how many inches of height of the engine (cavitation plate above the bottom) in relation to the inches of setback on a bracket. rich/Binkie
Tohsgib	posted 06-10-2009 09:54 AM ET (US)             If it is like an Armstrong bracket then it is 1 inch up for every 6" back. So a 30" bracket will allow 5" shorter engines. This however does not follow on Jackplates which is trial and error but allows much greater height with minimal setback.
R T M	posted 06-10-2009 01:08 PM ET (US)          Thanks Nick, I`m running 1 5/8" in height on a 6 1/2" setback on my 13 footer, with a 25hp 4 stroke Merc/Tohatsu, short shaft motor. I built a 6 1/2" adjustable bracket and through testing up to 2" in height, it seemed best at 1 5/8". The cavitation plate is slightly above the water, when planing. Then I discovered a crack in the bracket, so I just built a solid bracket for that height. I guess I`m within the norm. Also a Sting Ray hydro foil, really improved the ability of this low torque motor to plane the boat without that nose high attitude, with two persons in the back seat. Top speed is 28 mph GPS with two people, at about 5500rpm. rich/Binkie

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