Another Lock Your Prop article

Neil Gordon · Post by **Neil Gordon** » Jun 19th, '15, 06:58

From Yachting Monthly. http://www.yachtingmonthly.com/gear/loc ... spin-29526

By the way, have you noticed that the button for starting a thread says, "New Topic." Should we petition the web masters for a "Here We Go Again" button?

sharkbait · Post by **sharkbait** » Jun 19th, '15, 08:08

I would think more consideration should be placed upon the transmission design. Does the transmission require pressure feed lubrication? If so is the pressure pump on the input shaft or the output shaft. If the components are just setting in a sump bath of lubricant then only external forces apply.

Actually who really cares either way.

Neil Gordon · Post by **Neil Gordon** » Jun 19th, '15, 08:33

sharkbait wrote:Actually who really cares either way.

Considering that we've been hotly debating this for a decade or so, I suspect just about everyone!

tjr818 · Post by **tjr818** » Jun 19th, '15, 08:40

shark bait wrote:...Actually who really cares either way.

Certainly those of us who steer by tiller care

Jim Walsh · Post by **Jim Walsh** » Jun 19th, '15, 08:56

http://www.plaisance-pratique.com/IMG/p ... rticle.pdf

A locked propeller produces greater drag according to this scholarly treatise. The Yachting Monthly article referenced appears to have been conducted by a couple of neophytes.

That being said I lock my prop because I can hear it spinning under the right conditions.

David Morton · Post by **David Morton** » Jun 19th, '15, 10:05

Ok. Here we go. The gloves are coming off!

A direct quote from page 44 of the Yanmar YM series Op Manual:

"When sailing, set the remote control handle in NEUTRAL. Not doing so WILL introduce slippage or any damage and void your warranty."

Note caps for emphasis is from Yanmar, not me!

joemerchant · Post by **joemerchant** » Jul 6th, '15, 09:10

The cure to the ailment and argument is a folding or feathering prop. Side-effects vary and include poor backing, stuck blades, difficulty in finding happy spot for pitch, nausea, cramps, bloating, difficulty swallowing...

moctrams · Post by **moctrams** » Jul 6th, '15, 09:28

And don't forget, you lose your taste for beer.

Neil Gordon · Post by **Neil Gordon** » Jul 6th, '15, 10:07

From my point of view, at slow speeds the prop doesn't spin whether it's locked or not. At hull speed, it doesn't matter. So it's the in between part that's all we need to worry about.

I don't particularly like the whine of the prop/transmission turning... and noise = wear.

Now perhaps the more important question:

Which of a locked or spinning prop will stimulate more barnacle growth?

Jim Davis · Post by **Jim Davis** » Jul 6th, '15, 15:09

Neil

I agree with you and will add to your observations that I have never seen a locked prop winch in a lobster pot or crab trap.

Carl Thunberg · Post by **Carl Thunberg** » Jul 6th, '15, 15:44

I know the troll is out there lurking, just waiting for the right bait. Fish on!

winthrop fisher · Post by **winthrop fisher** » Jul 6th, '15, 17:11

NEIL see what you started

Neil Gordon · Post by **Neil Gordon** » Jul 6th, '15, 17:18

winthrop fisher wrote: NEIL see what you started

Who me???

Dick Villamil · Post by **Dick Villamil** » Jul 6th, '15, 20:08

so - a locked prop will be in the slip stream of the keel where the water is already turbulent and there fore will offer less resistance than if it is spinning out of the cavitating water immediately aft of the keel. I have a 2-bladed prop and try to lock it vertically so that only one of the two blades is in the undisturbed water lateral to the keel. This is when compared to when the prop spins both blades enter the smooth water to the sides of the keel. I generally stock the best beer in the engine compartment to bribe the crew to fetch the beer and while you are there, turn the prop shaft so the red mark is up (indicating that the prop is now vertical).

John Stone · Post by **John Stone** » Jul 6th, '15, 20:11

The only way to be sure is to not have a prop. But who would want to do something silly like that.

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