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Old 04-02-2013
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Re: Adding Hydro Foil to Yamaha 8 HP 4 Stroke on 27 Catalina

What speed are you running the motor at?

If you run the motor at full throttle you will not going any faster than half throttle (in light wind conditions), but you will put the motor a lot closer to the water and burn up a lot more fuel.

With a GPS it is easy to figure out what your hull speed is while motoring. Throttle down until you get just below that speed and the boat probably won't squat so much. You'll also get much much better fuel economy (like 2x).

Below hull speed the boat won't squat too much, it'll just go faster. Above hull speed more throttle will just make the boat squat more, but it won't go any faster.

Reserve higher throttle for quick acceleration, deceleration, and pushing with the motor into a high head wind.
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