Twin screw rotation

[HowardParticipant @howard79726]

At a recent club meeting the topic came up of in which direction the propellors should rotate on a twin screw model. The majority opinion was that, when viewed from the stern, the port (left) propellor should turn anti-clockwise and the starboard clockwise. Is there a hard-and-fast practical or scientific rule about this or does it not really matter so long as the props contra-rotate?

[HowardParticipant @howard79726]

[Dave MilbournParticipant @davemilbourn48782]

Generally speaking, for fast boats the props rotate inwards (port prop = clockwise) while for manouvering models it's the opposite – viewed from the rear of the model.

Dave M

[Author]

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