Feathering Prop vs. Fixed Blade Prop - Page 7 - SailNet Community
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post #61 of 71 Old 02-10-2011
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How exactly do you do that? I too have a two blade fixed and have often wondered how to align it.
You have to get into the water and align the prop vertically and then mark the shaft inside the boat. Then, when you are underway, you can put the transmission in gear at the right point to stop the prop when it is vertical. It's a PITA and not particularly effective on fin-keeled boats. 'Course, with your skeg hung rudder, it will provide some drag relief.
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post #62 of 71 Old 02-10-2011
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With the transmission on the PS boats you need to leave it out of gear while sailing. So part of the question is once it is vertical in line with the skeg, will it stay that way with the transmission disengaged. The other part is how do you get it vertical in the first place. Seems like taking it out of gear at exactly the right moment would be a low probability exercise, but I have not tried so maybe it is easier than I think.

I was hoping the anwer would be that with the transmission diengaged it will automatically line up with the skeg and stay that way.

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post #63 of 71 Old 02-10-2011
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Originally Posted by RainDog View Post
With the transmission on the PS boats you need to leave it out of gear while sailing. So part of the question is once it is vertical in line with the skeg, will it stay that way with the transmission disengaged. The other part is how do you get it vertical in the first place. Seems like taking it out of gear at exactly the right moment would be a low probability exercise, but I have not tried so maybe it is easier than I think.

I was hoping the anwer would be that with the transmission diengaged it will automatically line up with the skeg and stay that way.
There's no way the prop is going to stay vertical with the tranny out of gear. I think you'd need to install a shaft brake. Like I said, it's a PITA.

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post #64 of 71 Old 02-10-2011
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There's no way the prop is going to stay vertical with the tranny out of gear. I think you'd need to install a shaft brake. Like I said, it's a PITA.
As I feared. I guess it is a freewheeling two blader for me.

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post #65 of 71 Old 02-10-2011
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With the transmission on the PS boats you need to leave it out of gear while sailing.
Why does the transmission have to be left out of gear while sailing? I have not run across that in the Yanmar material that I have for my 3HM35F with a KBW 10-E clutch.

I have painted marks on the shaft between the coupling and gland that correspond to the two blades of my prop. I also have a mirror in the engine compartment that lets me see the marks through the opened door below the companionway steps. I look in while my wife shifts in and out of gear until we get the marks stopped in the right spot to have the propeller up and down. I think the boat goes faster; she does not. Both of us think it a lot less noisy and much easier to sleep when sailing at night with the propeller stopped.

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post #66 of 71 Old 02-10-2011
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Why does the transmission have to be left out of gear while sailing? I have not run across that in the Yanmar material that I have for my 3HM35F with a KBW 10-E clutch.
I got that from: http://www.sailnet.com/forums/diesel...e-sailing.html

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post #67 of 71 Old 02-10-2011
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I cannot imagine why PS thinks that the transmission needs to be left out of gear. Its not like a car transmission with syncros which do not like to be shifted with the engine off. Actually race boats do this all the time. Typically the shaft is marked when the boat is out of the water so that you can locate the blade up position (mark both blades). When you want to center the blade, you put the transmission in neutral and then rotate the shaft with your hand (in the engine compartment) until the marks show teh blade is in the up position. Then you put the transmission in reverse. That locks the shaft on most marine transmissions.

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post #68 of 71 Old 02-10-2011
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Thanks for the link.

It looks like I will be getting used to the noise.

My wife will appreciate not doing the "put it in reverse, no that is not right, put it in neutral, now reverse, no that is not right, put it in neutral...." She will also positively glow saying it doesn't make us go faster anyway.

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post #69 of 71 Old 02-10-2011
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I cannot imagine why PS thinks that the transmission needs to be left out of gear
Not PS, Yanmar.

This applies to (almost) all Yanmar engines regardless of the boat they are installed in.

The Yanmar service bulletin in the first post of the thread linked above explains why.

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post #70 of 71 Old 02-11-2011
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Interesting, I've always just put in in reverse. Usually I forget and once I'm sailing I'm NOT going to try to stop the spinning shaft. I never had to mark the shaft, the shaft coupler with bolts up/down indicates the prop is vertical (don't know if that's by design). When sailing in with this config, I never hear any chattering, the force seems constant but after an initial test when I went below, I haven't checked it since different conditions.
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