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- Q127 - Navigation Problems: Oceans
353. The propellers on your twin screw vessel have a pitch of 16'04″. What is the distance in a day's run if the average RPM is 94, and you estimate 7% positive slip?
The distance run is calculated by multiplying the propeller pitch by the total revolutions in a day, reducing the result by the positive slip percentage, and then converting feet to nautical miles; twin screws do not require doubling the distance.
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