6.2.4 Driving at high speed
If the engine has an electro-hydraulic power trim, the basic trim angle adjustments are as follows:
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To plane the boat, adjust the trim all the way down (bow down).
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When the boat is planing in low waves, raise the trim until the boat starts to porpoise, the propeller loses grip or the engine reaches the upper limit of the normal adjustment range. When this happens, lower the bow slightly until the ride is stable. The log (speed indicator) can be used to optimise the trim angle.
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When the boat is riding into waves, lower the bow until the ride becomes smooth. When driving with a tailwind or driving into very high waves the raise the bow slightly to avoid ploughing through the waves.
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Do not drive the boat at a high speed with a fully negative trim angle (bow down) as this may cause the boat to roll from side to side and make steering unstable.
Consult the engine manual for more information.
At full speed the boat’s handling characteristics may deteriorate.
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Do not drive the boat with the bow too low because this could cause the boat to behave erratically.
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Be very careful when adjusting the trim angle at a high speed: it may radically affect the boat’s behaviour.
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Sudden turns at a high speed may result in loss of control. Slow down before sharp turns.
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Waves reduce the boat’s manoeuverability and can cause the boat to swing fromside to side. Reduce the speed when wave height increases.