shroud tension 1976 h27

[Conner Atkeson]

I have been unable to find the correct figures for the shroud tension on 1976 h27. The boat has been successfully raced over the years but at no time have the shrouds been correctly adjusted. Any assistance with this problem will be greatly appreciated.

 

[Ed Schenck]

Real numbers?

I have all the "manuals" for my '79 H37C and there are no load numbers published. All that I have found are percentages based on the rating of your wire. See Related Link and then read "Spar Talk". You should also search "Forum Archives" for 'rig tension', I think you will find those percentages.Here's one example from the archives(for an H26):"Greg at Hunter Marine informed me via email that 10% for lowers and 20% for uppers is correct. Since the shrouds are 3/16 stainless, the breaking strenght is 4700lbs. So, lowers should be tensioned to 470#, uppers to 940#. (note, Greg only confirmed the percentages, I got the pounds from other sources). Greg also says that 1 degree is the appropriate amount of mast rake."I have seen the 10%/20% mentioned for many boats.

 

[David Foster]

Here is what I use:

About 450 (nearly 10percent) on the lowers, and 600 (14percent) on the uppers. I believe that the most correct solution is to reasonably tighten them, then take them out in heavy winds, and tighten them so there is no slack on either tack - then tighten them down evenly some more to ensure they will not slack even in higher winds.I got my numbers from the head instructor at Adventure Plus in Sandusky.Ed's suggestion of 10%/20% is the most often quoted quick rule. I wasn't using the higher number on my headers because of the advice mentioned above, and problems with collapse on my mast step. I fixed the (rotten core under the) mast step this year, so I am no longer worried about the compressive load. But the shrouds have never been close to slack even in 25 knot winds, so I see no need to stress the rig further.DavidLady Lillie'77 h27

 

[Conner Atkeson]

h27 shroud tension

I appreciate the response on shrough tension. I also learned about the percentages based on the breaking strength of the shroud wire. I had not known that before