Farr Ims 40.7 and possibility of putting aft swept back wire? - Page 2 - SailNet Community

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  #11  
Old 06-02-2012
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Re: Farr Ims 40.7 and possibility of putting aft swept back wire?

Quote:
Originally Posted by SchockT View Post

Another option for stabilizing your mast might be to relocate your chainplates aft, and sweeping your spreaders aft. I had a small race boat with a very bendy fractional rig, and it didn't need a backstay at all due to the aft swept spreaders. Of course it was a much simpler mast than what you have.



P.s. If you do end up buying a new mast, I have heard of people retrofitting the old IMS 40 mast with the newer and simpler Farr 40 rig.


Of course you could just train your crew better! Especially the runner guy!
If its the sail plan illustrated in the drawing, because of the jumpers at the top, it looks more like the 39 M/L. If so, there's nothing that a backstay will do other than open up the top of the main. There's no way to 'stiffen' the top of the rig. It's a great and very tweaky rig, but not one for anything less than an experienced crew. You need two runner guys in any sort of breeze, always, no exceptions.

The 'PS' part might be the best solution, but in any case, there's going to a lot of cost to make the structural changes (chain plate location, etc..) that are necessary. You might want to contact Hallspar or a similar spar maker and see what a new rig with swept back spreaders, etc... might cost. Honestly, I think the Farr office's answer was the correct one.

Last edited by puddinlegs; 06-02-2012 at 02:30 PM.
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  #12  
Old 06-02-2012
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Re: Farr Ims 40.7 and possibility of putting aft swept back wire?

I agree. Redesigning a rig on a boat like that is not a project for the inexperienced. All you would do is destroy the resale value of the boat along with the performance.

No matter what you do, there will always be a risk of breaking that mast if you and your crew don't know what they are doing. Even experienced race teams break their masts; big budget teams even have spares!
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Old 06-04-2012
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Re: Farr Ims 40.7 and possibility of putting aft swept back wire?

Quote:
Originally Posted by puddinlegs View Post
If its the sail plan illustrated in the drawing, because of the jumpers at the top, it looks more like the 39 M/L. If so, there's nothing that a backstay will do other than open up the top of the main. There's no way to 'stiffen' the top of the rig.
Thank you and 3 questions?

1. Jumpers? You mean wires like stays at the top?
2. Even if I put Permanent backstay, wouldn't it be helpful for making rig
stronger?
3. Openning up the top of the main means that when I pull the backstay
it just help to twist (=open) the main. isn't it related to move the
draft back of sail that help for beating?
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Re: Farr Ims 40.7 and possibility of putting aft swept back wire?

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Originally Posted by SchockT View Post
I agree. Redesigning a rig on a boat like that is not a project for the inexperienced. All you would do is destroy the resale value of the boat along with the performance.

No matter what you do, there will always be a risk of breaking that mast if you and your crew don't know what they are doing. Even experienced race teams break their masts; big budget teams even have spares!
Yes, I will take your advise not to redesign the rigs and will do more trainning before next race

Someday When you have chance to visit Korea, hope to sail together ^^
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Re: Farr Ims 40.7 and possibility of putting aft swept back wire?

Quote:
Originally Posted by thenzsea View Post
Thank you and 3 questions?

1. Jumpers? You mean wires like stays at the top?
2. Even if I put Permanent backstay, wouldn't it be helpful for making rig
stronger?
3. Openning up the top of the main means that when I pull the backstay
it just help to twist (=open) the main. isn't it related to move the
draft back of sail that help for beating?
The masthead backstay on your rig primarily serves as a mast bending tool. Bending the mast flattens the mainsail. Bending the mast will also twist off the top of the sail if you don't compensate with more sheet tension. The permanent backstay will prevent your mast from falling down in the absence of the runners, but it will not make it stronger. In strong wind a serious mistake on the running backstays could still break your mast!

The running backstays control your forestay tension, and your check stays limit the amount the mast bends, and prevents it from "pumping" through waves.
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