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Old 28 October 2013, 05:48   #31
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Country: UK - England
Town: Leeds
Make: Valiant 450
Length: 4m +
Engine: Yamaha 55HP
Join Date: Jan 2013
Posts: 448
In a honesty, I'm wondering if the boat may be operating above its horsepower rating. I'm not sure what the recommended max is for the. 4.7, it may be the hull is just a touch short for the power. If there is no chine walking with the 18, that may be as much as you can do, other than gamble on a 19. But if the chinewalking begins at 19, you may have wasted your money. After all you are only losing a knot or two but gaining good handling with the 18, and as you have found out, propping is always trial and error.
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