Boat sailing on Yedda - People. Sharing. Knowledge.

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FlyingDutchman

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It is not a simple question - in general you would expect to go faster due to the laws of physics - you put extra energy to go ahead, so you will go faster then without engine, but not 6 extra nots. As the friction of the boat in the water is not linear it means the faster you go the more energy you need to get into a higher speed, The pushing power btw is not related to the speed of the current - water is so slow the propellor always has time to push agains the current

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OronD

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Hi,

Sure, no question, if with sails only you go at 7 knots, now you add the power of the engine (at the same direction !) and push it additional 6 knots it will sure increase the speed to roughly 13 knots (several factors might effect it, though [e.g. increased wind resistance, engine working with the water current, waves, angles, not the same direction, tilt, etc]).
Best regards,

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Agapi44

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It is not so simple. The propelor is now working in a stream that moves backwards at the speed of 7 knot so it cannot create the pushing power on the water that in a normal state (without the sails) will push the boat at a speed of 6 knots.

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