Diagnostic

Turning to propellers

Published on 01 april 2015 at 0h00

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First of all, to choose the right propeller, a few bits of information need to be collected. The boat’s displacement, hull shape, windage, all more important than on a monohull , are of course the first things to establish. Closely followed by the motor characteristics: graphs showing torque and power developed for a given level of rpm, type of gearbox and reduction ratio are all essential so that a real propeller specialist can work out your optimum prop, an appendage which is all too often overlooked. Be careful not to fall into bad habits inherited from years of monohull sailing. Twice the power installed in each hull does not equal the same power installed in the same-sized monohull. Also, if you really want to get to the heart of the matter, your expert should be able to provide further essential information: maximum torque on the propeller, and maximum diameter. And now you’re getting into a really in-depth debate, beyond the comprehension of mere mortals, but which can have big repercussions on the performance of your multihull. A good propeller is always going to be a very good investment. It is the only thing which can compensate if your boat feels under-powered. And in the case of increased power, it will always have a positive effect on fuel consumption, potentially resulting in a significant reduction.

What makes matters get even more complicated is that we like a propeller which offers maximum effect going astern, not just ahead, for ...

This article appeared in issue 141. To read the article in full, buy this issue individually

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