Fixed vs. Folding Props: How Much Difference? - Page 2 - SailNet Community
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post #11 of 17 Old 07-14-2007
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Originally Posted by ianhlnd
Hey Sd, it's 0213 hrs on the east coast...... GO TO BED!!!! Give us other guys a chance
LOL... never been one to need much sleep...

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post #12 of 17 Old 07-15-2007 Thread Starter
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Good information there, Valiente. Thanks! 1/2 kt, eh? Didn't expect it to be that much.

Don't know what brands they are, guys. I'm guessing the fixed prop is probably original equipment, whatever that was. By the fact the PO has tended to put nothing but top-quality stuff on the boat, by way of upgrades, I'm also guessing he didn't skimp on the folding prop. I'll have to ask him what it is.

Thanks,
Jim
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post #13 of 17 Old 07-15-2007
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Quote:
Originally Posted by Giulietta
Some folding props are really bad and crappy...
Identify, please.
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post #14 of 17 Old 07-15-2007
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Smile Fix all the way

Remember, the more moving parts the more chance of a problem. I have NEVER lost a fixed prop but I did loose a folding prop in the middle of Sir Frances Drake channel two years ago. Keep the folding as a spare. The speed difference does'nt matter unless your in a real hurry.
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Quote:
Originally Posted by wine1959
Remember, the more moving parts the more chance of a problem. I have NEVER lost a fixed prop but I did loose a folding prop in the middle of Sir Frances Drake channel two years ago. Keep the folding as a spare. The speed difference does'nt matter unless your in a real hurry.
Any prop can be lost, fixed, folding or otherwise. That you lost a folder doesn't constitute an indictment of folders. And whether or not the speed difference is important is merely your opinion, not a statement of fact.

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On a long ocean passage, the speed difference could well matter... a speed difference of just 1/2 a knot is 12 nautical miles per day...and over a longer passage those 12 nm add up to possibly getting in a few days earlier than not having the folding prop.

Also, sailing in tidal currents... if you can make five-and-a-half knots against a two knot current, you're going 3.5 knots...if you can only make five knots, you're going 14.3% slower.

If the folding prop gains you a full knot, then the differences will be even larger. Over a ten-day passage, with a speed difference of one knot, your talking 240 nautical miles difference... that's two days worth of sailing in many boats.

Quote:
Originally Posted by wine1959
Remember, the more moving parts the more chance of a problem. I have NEVER lost a fixed prop but I did loose a folding prop in the middle of Sir Frances Drake channel two years ago. Keep the folding as a spare. The speed difference does'nt matter unless your in a real hurry.

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—Cpt. Mal Reynolds, Serenity (edited)

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post #17 of 17 Old 07-15-2007
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Quote:
Originally Posted by SEMIJim
Good information there, Valiente. Thanks! 1/2 kt, eh? Didn't expect it to be that much.
That's strictly in light air. If I had my No.1 and the full main loosely tensioned on a beam reach in eight knots of wind, I would make four knots with the fixed prop. With the Gori, I make 4.5 knots. I also notice that in very light air (sub-5 knots), the boat WILL move in situations where a one-knot counter-current would completely defeat it previously.

Over 15 knots, I can't see any difference, but for typical high-summer sailing in Lake Ontario, that 1/2 knot gain is pretty obvious and is welcome, as is the perceptible acceleration now that there isn't a fixed prop.

When shifting gears at slow motor speeds, however, you have to rev the engine a bit more at first to get the blades to deploy...a small consideration, but it can affect your timing in a tight place.
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