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post #1 of 20 Old 09-17-2013 Thread Starter
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Prop turns

Hi All,

We were out sailing the boat first time last week and I lifted the engine hood to have a peek and saw the prop shaft turning. OK, I get that, the gearbox is in neutral, water flow over the pitched prop...

What's the difference in boat performance or equipment wear and tear from a fixed pitch to a feathering prop?

Dave

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Re: Prop turns

Don't know the answer to your specific question, but you can keep the prop from turning (and thus stealing that energy away from your boat) and negate the extra wear and tear by leaving it in gear.

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Re: Prop turns

But should you put it in gear while under sail? I don't know. We may be talking about something that's of minimum importance.

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Re: Prop turns

Different manufacturers have different recommendations as to the proper gear selection while sailing.

We have a Hurth gear and lock the shaft in reverse. Yanmar/Kanzaki makes a specific recommendation against that practice, wanting the tranny in neutral.

Ron

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Re: Prop turns

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Originally Posted by Rhys05 View Post
Don't know the answer to your specific question, but you can keep the prop from turning (and thus stealing that energy away from your boat) and negate the extra wear and tear by leaving it in gear.
Actually it is the locked prop that slows you down..

What position to place your gear in is dictated by the gear manufacturer.

Hurth/ZF = Reverse or Neutral

Kanzaki/Yanmar = Neutral or a shaft brake must be fitted for locking

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Re: Prop turns

This Video answers this age old questions.


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Re: Prop turns

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This Video answers this age old questions.

Which has less drag? A fixed or a spinning propeller - YouTube

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Re: Prop turns

Since there's no pt2 I'm going to guess the is less resistance with the prop turning. Hence a feathering prop would be less drag of anything. Worth the expense on a 31' cruiser???

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Re: Prop turns

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Originally Posted by Dave_E View Post
Since there's no pt2 I'm going to guess the is less resistance with the prop turning. Hence a feathering prop would be less drag of anything. Worth the expense on a 31' cruiser???
We LOVE our Max Feathering prop... but they're pricey.

Ron

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Re: Prop turns

Pricy (2700 $) and don't like driftwood much.Advantage is that they fail completely before the shaft bends.The parts are not interchangeable and after you cut off the end of the shaft to fit the maxi your solid wheel may not have a place for nut and cotter.But you don't have to drag that bucket or lock the shaft. For me it's a write off come tax time and we all know it's about the increased speed.Even on a gaffer.
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