Join Date: Mar 2006
Location: New England
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Yes, but I bet your 7.5 Johnson is a two-stroke, not a much heavier four-stroke,
which is likely to be all the OP can buy nowadays.
Originally Posted by Hartley18
Funny you should say that Dawg.. our little Hartley has a Johnson 7.5 that has been with the boat since the early 80's. Better not say that too loud - it might get upset!!
There is an article in the latest edition of Australian Sailing on this very topic and a few of us have had exactly this discussion to work out the smallest permissible outboard for the TS18 Class. The guidelines we were working to (from the Racing Rules) talk, not just about hull speed, but about maintaining
hull speed into a 12kt breeze for 3 hours.
The end result was that, for an 18-20' boat, even though you could probably get to hull speed with a 2hp going flat-out, the smallest
outboard you should have is a modern 3.5hp or old 4hp with around 15 litres (whatever that is in your currency) in fuel.
Remember: Outboards work best at 3/4-full throttle, so getting a big one is not necessarily better.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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