Abstract
When designing a ship, we first have to settle the efficiency of the screw propeller, its number of revolutions and its diameter. The decision about the other details of the screw will follow when the ship is under construction. Two propeller charts are offered which may easily serve all design purposes. An example of a full-power thrust curve for a tug is given considering fixed and variable pitch propellers. The problem of shallow immersion of screws is touched. Throughout the new symbols of the International Tank Towing Conference are used.
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