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How fast can a 15 hp outboard go in a 12ft tinnie?

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Yeh ^ that ^

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  1. it depends on the prop pitch. for example a prop with a 15deg pitch will move forward 15in with one revolution and zero slippage. allow 35-40percent for slippage to calculate boat speed. then calculate the friction of the hull in the water and subtract it to get boat speed through the water.


  2. Approx 25mph top, with right prop.
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