If it ain’t broke…

The late, great Thomas Colvin advised that one needed about 1HP per ton of displacement for one’s auxiliary engine. Note the emphasis on the word auxiliary. Using Colvin’s formula, that works out to an 8HP engine for the Islander 36. Our current raw water cooled Yanmar 3HM is a 27HP. Of course, Tom Colvin was …

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What happens when you say “Electric Propulsion” three times…

For some reason or other, the idea of pulling out the raw-water cooled Yanmar 3HM and replacing it with an affordable, minimal electric propulsion system keeps playing around my thoughts. Having spent a bunch of years developing a variety of electric propulsion installations on our CAL 34, I do have some experience but came to …

What happens when you say “Electric Propulsion” three times… Read More »


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