26 July 2011, 08:06
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Member
Country: UK - Channel Islands
Town: Alderney
Length: no boat
Join Date: Sep 2006
Posts: 3,047
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RYA Powerboating Article
On another plane | Boat Handling - Power | Cruising | RYA
On the plane ease the leg out to achieve the best speed. Ease out too much and the prop sucks in air from the surface, making it spin faster but lose grip on the water, therefore slowing the boat. Ease the leg out by the correct amount and the revs increase slightly without the throttle being adjusted, therefore speed increases.
If the boat starts to porpoise (the bow bounces up and down), trim the leg in to regain control, and then slowly ease out to re-trim.
Trim needs constant adjustment. If crew move around the boat or there is a change in sea conditions or speed, you need to check the trim. Fuel use makes the boat lighter – you may need to trim differently when tanks are full or half empty.
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