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These guidelines are for larger outboards with planing type hulls, not displacement hulls.
Your reference point is the lowest part of the hull, or keel.
When the anti-ventilation plate is in line with the bottom of the hull, this is Standard.
The engine can be raised 1in. ( 25mm ) above standard for every 10 MPH ( 17km/h ) above 40MPH ( 64km/h )
So if the boat can do over 40MPH ( 64km/h ) the engine can be lifted 1in. If the boat can do 50MPH ( 80.4km/h ) it can be lifted another 1 in. and if possible and the boat can do 60MPH ( 96.5km/h ) the motor can be lifted another 1 in.
So if you have an outboard that can run at 60MPH (96.5km/h ) then your engine should be no less that 3 in. above the lowest part of the boats hull.
But.... For every 12 in. ( 305mm ) the outboard is behind the transom, or a notch in the transom, the engine can be raised 1 in. ( 25mm ) above standard.
The rule in the outboard set up buisness, is that water exiting the bottom of the hull, when on the plane should not be flowing over the top of the anti-ventilation plate, but below it, this reduces drag on the lower unit.
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JudyTransom height for an outboard motor is typically measured from the top of the transom to the bottom of the boat hull. To measure, place a straight edge vertically against the transom and measure the distance to the bottom of the boat hull. This measurement helps ensure proper motor performance and clearance in the water.
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