Explain what is meant by left and right hand propellers and also explain the rotation of propellers in twin screw ships?

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Propellers are either "Left Hand" or "Right Hand". When the propeller is viewed from the blade edge or its side, the blade is angled upward to the left (Left Hand) or upward to the right (Right Hand).
See illustration.

enlarge Regards, Mike Leary misticmike@googlemail.com
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