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Forum: Multihull Sailboats

03-12-2011, 10:54

Replies: 14

40' Jim Brown Searunner

Views: 6,788

Posted By jmarples

Re: 40' Jim Brown Searunner

Roy, It sounds like you have the right combination of prop and engine but the shaft diameter is marginal for 27 HP. It should be at least 1 1/8. The problem is the propeller is cantilevered out...

Forum: Multihull Sailboats

03-12-2011, 08:15

Replies: 14

40' Jim Brown Searunner

Views: 6,788

Posted By jmarples

Re: 40' Jim Brown Searunner

John, All engine/prop combinations are compromises. The 2.6 reduction will need a larger shaft and prop (heavier+ more$) because it produces more torque at the prop. It gives more bite too. But...

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