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Hello all,
First I would like to say it's great to have a forum like this, lots of informative discussion. I am a new MK 5 owner and I have a question about stay tensions for the mk 5. I have read the previous post about this topic but didn't see any specific numbers for the mk 5. I have set the tension with a Loos guage; the outer stays are set to 33, the inner 's are set to 29 with the intermediate ones at about 11. The forestay is set to 34. I am wondering if these values are in the right ball park. I would apreciate your imput.
Cheers.
Stephen
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Last edited by (2008-07-22 12:50:11)
Sneaky Pete:
Where are you sailing out of?
I could give you the tension readings I have on my Mark V but it all depends on which Loose gauge you are using. If you are using the standard pull tension gauge you'r readings will not be the same as mine as I'm using the "hands free" professional gauge.
Your numbers sound in the ball park for the uppers, but a little light on the lowers and high on the intermediates.
How does the rig look under sail in about 8 - 10 knots?
Is it in column? How much prebend do you have with the back stay slack?
If it's in column under sail then your uppers, lowers and intermediates are right. Depending on the main on your boat you should have about 3 - 4" of prebend with a slack back stay, more if you have a main that is full cut and less if it's really flat. The prebend is a function of the amount of tension on the uppers, so if you add tension to the uppers, to increase prebend, you will have to increase the tension on the lowers and intermediates proportionatly. Head stay tension is irelevant because you want to adjust that as you are sailing, by tensioning the back stay. Light air, flat sea minimum tension on the back stay, as the wind increases and as you want to point higher tension the back stay. Powering up as you come off the start line minimum tension on the back stay as you build boat speed and want to head up tension up the back stay.
Hope that helps.
Steve Reid
Still Knot Working Mk V #75
Etobicoke Yacht Club, Toronto
Offline
Last year, I took delivery of my Mark V from a yard and the rig was setup by the yard and I never checked their settings with the LOOS (not very bright on my part).We were fast. This year we set the uppers to 32-33 and the lowers to 25 and the smaller diameter uppers to some low number because these shrouds have lower breaking strength. This year we are slow-by quite a bit. This is sailing in winds less than 10 kts for the majority of the time. So this past Monday, I decreased the uppers tension by one full turn on the turnbuckles (without the gauge handy). This was done because I had observed no hint of slack on the leeward uppers when going upwind and very slight slack on the lowers. I will get a measurement, and more importantly,find out if our speed picks up relative to the competition. Frustrated on LI sound
copasetic
Thanks for the reply, you might be right about the tension on the inner stays. I have about 6" of rake in the mast and the mast was centered before setting the tension. While out for the Wednesday night race tonight, in light winds I noticed the inner stay was a little loose, every thing else seemed ok. The boat was very quick. I sail out of Dartmouth Yacht Club, Nova Scotia.
Cheers,
Stephen
Stephen:
6" of rake on the Mark V is not very much. The boats around here that are doing well are all running anywhere from 12 to 16" of mast rake. I think you will find that the boat will point much higher if you increase your rake.
Steve
Still Knot working MkV #75
Offline
For what its worth, we reduced upper shroud tension from the 30+ to approx. 24 on the Loos (the 2-handed version) by 1 turn on the stbd. turnbuckle and 1 1/2 on the port. Our boatspeed was restored. This is for 8-10 kts on LI Sound. The higher tensions seem to be for the Canadian breezes of 15 and up- I am guessing?copasetic
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