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post #1 of 3 Old 01-13-2008 Thread Starter
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prop sizing

My Express 30 a close cousin to C&C 29's and 30's, with a Yanmar 2 GM has a martec 16 d x 10p prop. Similar sized and likely powered Beneteau in the yard has a 15d x 12p prop?
Comments on the benefits of one versus the other??
Don

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post #2 of 3 Old 01-13-2008
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That sounds large for a 30 footer. My 33 footer had a 12 x 6 fixed two-blade Michigan Wheel, and I traded that for an 11 x 8 Gori folder. A friend with the same boat has a 14 inch wheel (we both have Atomic 4 direct-drives on 7/8" shafts), but that's about the upper limit.

Hell, my 15-tonne steel 40 footer has just an 18 x 13 three-blader, although that's getting changed to a 19 x 15 feathering four-blader.

Benefits are variable in terms of what you want to do, the engine size and state, and the type of prop. If it's fixed, a big prop will create drag...if it's a folder (usually a touch smaller), it will lag and be weak in reverse, and won't push the boat as well...but you sail faster.

Last edited by Valiente; 01-13-2008 at 05:11 PM.
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post #3 of 3 Old 01-13-2008 Thread Starter
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the prop is a 2 bladed folder.

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