The pinnate propeller is a programmable pitch propeller constructed for the purpose of eliminating transient cavitation, vibrations and noise, Two inherent qualities of the pinnate propeller, better vibration performance and reduced risk of fatigue may be utilized for the purpose of achieving better propulsive performance by allowing for a larger propeller diameter and thinner blades. The ability of the pinnate propeller to cope with very unhomogenous wake fields makes it possible to use ship shapes with lower resistance than for conventional propellers.

This paper combines the results of a paper read at the International Conference on Advances in Propeller Research in Gdansk Poland in February 1981, with some further model tests in order to show what gain in propulsive efficiency can be expected by using the pinnate propeller.

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