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Storm/Stay Sail deck mounting |
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SausalitoDave
Commadore Joined: 13 October 2014 Location: Sausalito Status: Offline Points: 366 |
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I posted some time ago how I installed an inner forestay on my 505. (Note: I had the advantage of a bulkhead right where I wanted to install the double pad-eye). I was trained as a mechanical engineer (although it has been a long time since I did any work in the field) but I did do load calculations and concluded that the deck alone was not going to support an inner-stay (as it is too flexible). I suggest there are two considerations. It is, I believe, critical that the vertical-component of the load be carried down to the hull. While it is possible that this can be done with a line (from the bottom of the pad-eye to the keel), I don't think that this alone is a great idea. I believe this because I believe it is also important that the moment created by the total-load (in my case created by the bracket that supported the pad-eye) not be carried by the deck alone. This "twisting" will cause deformation, potential leaks, and a potential failure. I used 10,000# SS wire for the forestay; even a fraction of that load is a lot to be carried by the deck. A storm sail takes a lot of load under static wind conditions; when hit by a wave or big gust it is hard to estimate the total forces. I wanted to be certain that the first point of failure to be the sail, not the deck.
Dave Hanse 505 Festina Lente Sausalito, CA Edited by SausalitoDave - 03 February 2016 at 22:20 |
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iemand
Admiral Joined: 13 February 2004 Location: Germany Status: Offline Points: 1082 |
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just as an Idea for a Hanse 400/370: Why not take the cleats with dyneema 10 mm available now triangular?
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Hanse 312 MJ 2004 - Hanse 370e MJ 2007
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kiwihanse
Lieutenant Joined: 25 April 2011 Location: New Zealand Status: Offline Points: 49 |
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Hi Niel, this forum (400) go to the bottom of the page and select page 7.
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kiwihanse 400e Any two yachts heading in the same direction, then it's a race!
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neilbay
Lieutenant Commander Joined: 03 June 2015 Location: Opua Status: Offline Points: 62 |
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Hi All
Well the job is finally finished. The final result used a rod that in effect extends the stay through to the foremost bulkhead. Photos below :uploads/4945/Deck_Tie_Rod_DWG.pdf
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Hanse 400 2007 - Back in NZ
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SausalitoDave
Commadore Joined: 13 October 2014 Location: Sausalito Status: Offline Points: 366 |
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Looks great. Nice and clean. Congratulations!
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giovanni_prato
Sub Lieutenant Joined: 10 September 2008 Location: Italy Status: Offline Points: 2 |
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i built the arch on a 320 this month for the same purpose. i'm going to plan the correct fittings on the mast and their correct height of attachments based on the need o not of a running rigging. ciao
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Bandy
Lieutenant Commander Joined: 25 May 2004 Location: Holland Status: Offline Points: 77 |
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in my boat there is a construction with counter plates on the bulkhead
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Bandy, Hanse 411 2003
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giovanni_prato
Sub Lieutenant Joined: 10 September 2008 Location: Italy Status: Offline Points: 2 |
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http://www.myhanse.com/uploads/1774/baglio_hanse320.jpg
http://www.myhanse.com/uploads/1774/baglio1_hanse320.jpg http://www.myhanse.com/uploads/1774/baglio2_hanse320.jpg http://www.myhanse.com/uploads/1774/baglio3_hanse320.jpg http://www.myhanse.com/uploads/1774/baglio4_hanse320.jpg the 320 hasn't a adequate bulckhead after the anchor locker, so i had to build an arch, i built it a bit further back of the anchor locker to have the center of effort more astern, to use also the staysail alone. i built it rigid to bring the load on the bulwarks. i plan to attach the innerstay soon after the upper spreaders, that being swept back at around 21° , will make the intermediate sidestays working as runners, and the addition a dyneema line simply fixed above the upper spreaders and to the stern cleat will suffice for any monster load. being always solo sailing and for long trips, i plan to use a furler to do the most of the operations always from the cockpit. |
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