Coastal Cruising Under Power: How to Buy, Equip, Operate, and Maintain Your Boat by Gene Hamilton & Katie Hamilton

Author:Gene Hamilton & Katie Hamilton [Hamilton, Gene]
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2006-04-06T22:00:00+00:00

Prop walk is an important issue on single-screw boats. A right-hand prop will push the stern to starboard when going forward and to port when backing. (Illustration by Christopher Hoyt.)

The props on most twin-screw boats rotate in opposite directions. Therefore, prop walk from one prop is counteracted by the other. (Illustration by Christopher Hoyt.)

The size and location of the rudder also affect the handling characteristics of a boat. Single-screw displacement boats most often have large rudders that steer the boat effectively even when the propeller is not turning (as long as the boat is moving faster than the current). High-speed boats have smaller rudders that are not as effective when the propellers don’t push water past them.

Differences in prop walk and rudder efficiency explain the different handling characteristics of single-screw and twin-screw boats. Of course hull shape, windage, and other factors make each boat unique, but we have found that most single-screw boats share similar basic handling characteristics, as do twin-screw boats. Keep in mind how prop walk affects which way your boat wants to turn, especially in reverse, and pretty soon you will be able to anticipate its movements.

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