Can anyone here advise? We have just re-engined our Westerly 33 ketch with a reconditioned Mercedes OM636 engine. The hull is pretty weedy so performance is not sparking on the initial engine test runs.
We are about to lift out and will be having a look at the propellor. Traditionally, Westerly 33s were regarded as 'over-propped' and the old engine never managed more than about 2400rpm. A quick web search suggests that we should achieve a cruising speed under engine of about 6.5 knts, with a possible max of 7 knts. calculation suggests that hull speed is somewhere just over 7 knts.Has anyone here knowledge of adjusting the prop pitch, or even of fitting a variable pitch prop to a Westerly 33?
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Westerly 33 and the Mercedes OM636
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