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Rigging Design |
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redback
Really should get out more Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502 |
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Topic: Rigging Design Posted: 10 Apr 05 at 10:04pm |
Could anybody explain the reasoning of using outriggers to support the rig on some single handed ocean going boats - such as Sill.
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ssailor
Far too distracted from work Joined: 11 Oct 04 Location: United Kingdom Online Status: Offline Posts: 430 |
Post Options Quote Reply Posted: 10 Apr 05 at 11:25pm |
Arent they like a fat set of spreaders giving a wider base to support the mast?
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Any one in need of quality carbon fibre work (tillers etc) at decent prices!
Int 14 Gbr 1244 'Nucking Futs' The New Port rule!!. |
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Scooby_simon
Really should get out more Joined: 02 Apr 04 Location: United Kingdom Online Status: Offline Posts: 2415 |
Post Options Quote Reply Posted: 10 Apr 05 at 11:29pm |
Guessing that the wider platform gives a number of benefits :
1, Being wider and with a "prodder", some of the shroud load can be converted into sideways compression load instead of tension "up" load. 2, Gets the side rigging/shrouds out of the way and so you can have more room around the boat for running rigging / lines etc 3, Further benefit of having the side rigging/shrouds further away from the boat you create a larger set of triangles to move the load around and generally provide more stability - this may also help with some of the boats that use wing masts (maybe) Just my late night Sunday guesses... |
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Wanna learn to Ski - PM me..
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maxim
Posting king Joined: 25 Nov 04 Location: United Kingdom Online Status: Offline Posts: 127 |
Post Options Quote Reply Posted: 10 Apr 05 at 11:46pm |
How much movement is built in to them - could you make them hydrolic etc.?
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Stefan Lloyd
Really should get out more Joined: 03 Aug 04 Online Status: Offline Posts: 1599 |
Post Options Quote Reply Posted: 11 Apr 05 at 8:40am |
Most keelboat and offshore rules don't allow you to adjust rig tension while racing, as it is thought likely to cause accidents. I don't know enough about the Open 60 rule to say whether this applies to them. |
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hurricane
Really should get out more Joined: 15 Mar 04 Location: United Kingdom Online Status: Offline Posts: 1047 |
Post Options Quote Reply Posted: 11 Apr 05 at 5:00pm |
49er do!! i love that fact!
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lifes to short to sail slow boats!
RIP Olympic Tornado 1976-2007 |
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redback
Really should get out more Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502 |
Post Options Quote Reply Posted: 11 Apr 05 at 8:17pm |
I was wondering if the wide base that this system provides maens no need for spreaders and hence a rotating mast can be used. We really need an expert to clear this up. Meanwhile - yes 49ers are allowed to adjust rig tension whilst afloat but make no provision for it, so you have to take out a block and tackle and take up the tension temporarily on a trapeze wire - not a very safe idea and probably never invisaged by the designer. If you want to see a boat where the rig tension is really played about with whist sailing have a look at the RS400 or for a more extreme example have a look at a Scorpion or Merlin. |
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tony198
Newbie Joined: 14 Jan 05 Online Status: Offline Posts: 14 |
Post Options Quote Reply Posted: 11 Apr 05 at 8:36pm |
having deck spreaders reduces the downwards pressure at the hounds, and it is changed into more of a sideways tension. This in turn letsa the mast rotate easier than with normal rigging arrangement. To make it easier imagine sticking a multijull rig on a mono, the deck spreader replace the outriggers. hope this made sense. Rig changes are allowed whilst racing on the Melges24 and Etchells (i think), and generally boats like the farr40 and kerr11.3 will change thier rig between races (I know I have to do it if the wind changes more than 5 knots)
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Stefan Lloyd
Really should get out more Joined: 03 Aug 04 Online Status: Offline Posts: 1599 |
Post Options Quote Reply Posted: 11 Apr 05 at 9:10pm |
Between races you can do what you want in any class and most keelboat classes will have a little table of optimum settings versus wind speed.
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tony198
Newbie Joined: 14 Jan 05 Online Status: Offline Posts: 14 |
Post Options Quote Reply Posted: 11 Apr 05 at 9:27pm |
optimum setting all depend on wind, sails sea conditions and also helm ability (loose forestay is fast but difficult to helm to). I'm still working on the tuning for the new sails on my boat, just a little bit different than the old sailmakers sails.
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