Proposed new spinnaker pole outer end fitting

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Proposed new spinnaker pole outer end fitting

Postby paul manning » Thu Aug 31, 2017 7:07 pm

Report from Andy Tarboton

I have put the new pole end fitting on for testing. Fitting it to the boat is really easy and I think it would work well in general.

I have done some comparison hoists and drops and received the following results:
Current setup 85 sec
New pole end 78 sec
This test was carried out on dry land, standing next to the boat and hoisting and dropping the kite 10 consecutive times to get and average as well as an idea of fatigue factors influencing hoisting and dropping from halyard friction. From this it is my conclusion that the new pole end has about 5% less friction in the system.

I then went sailing with the setup and noted that if the tack of the kite travels all the way to the opening in the pole end, then the tack of the kite is slightly below the top of the pole and gets pinned to one side of the pole. The solution is very simple - leave a 50mm length of tack line from the rack to the pole end when the pole is fully extended and this will allow the tack to just float above the pole end.

The new system is a proven one for preventing wraps around the pole so I don't believe we will have a problem with that if we move to the new fitting as a class.

I am hoping to get some pictures to go with my report back in the next week or 2 but hope this helps with the discussion.

I am always happy to chat ideas over with you with regard to trim etc if I can be helpful in any way.
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Re: Proposed new spinnaker pole outer end fitting

Postby paul manning » Mon Sep 04, 2017 12:46 pm

Note,

The proposed new end fitting is a solid turned delrin part. It is proposed that the existing sheave is simply removed and the new end fitting installed.
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Re: Proposed new spinnaker pole outer end fitting

Postby Bruce » Fri Oct 06, 2017 12:31 am

Hi Paul,

So in effect you get a longer pole, as the tack line will be taken from the very end of the pole rather than though the sheave ~50mm back?
Bruce
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Re: Proposed new spinnaker pole outer end fitting

Postby paul manning » Fri Oct 06, 2017 12:20 pm

Bruce, yes that is the proposal
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Re: Proposed new spinnaker pole outer end fitting

Postby Bruce » Sat Oct 07, 2017 11:13 am

Hi Paul,

My preference would be to match what we have as closely as possible, as I suspect this will make quite a big difference to downwind speed. Tying the tack line or halyard slightly differently, has a massive impact on speed, so I suspect this would be even more significant. You don't want to end up with one style being much quicker than the other. Presumably all you need is a hacksaw to get the exit point of the tack line to be similar?
Bruce
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Re: Proposed new spinnaker pole outer end fitting

Postby Rick » Sat Oct 07, 2017 11:27 am

If you want to match the position of the tack of the sail it gets messy due to the cut out in the pole for the block.

You'd have to cut through that which I guess would compromise the security of the new plug in the end of the pole.

The new plug will give I suspect about 30mm more extension than the block.

Many people don't tie tight to the block and seem to go ok.

I'd expect everyone would move over to the new plug as it seems a better solution and is not expensive.
Rick Perkins. GBR

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Re: Proposed new spinnaker pole outer end fitting

Postby paul manning » Sat Oct 07, 2017 12:03 pm

As ever, it's up to the class to vote upon :D

It was a point raised by the class and the builder has provided a proposed solution.
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Re: Proposed new spinnaker pole outer end fitting

Postby Bruce » Sat Oct 07, 2017 7:26 pm

OK think this needs to made very clear, as others I have spoken to also assumed the pole would be cut to give the same exit point for the tack line as the current solution.

Personally never had any issues with the current system, so don't want to be effectively forced to change in order to make sure I get the advantage of a longer pole.
Bruce
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Re: Proposed new spinnaker pole outer end fitting

Postby paul manning » Sat Oct 07, 2017 7:48 pm

Agreed
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Re: Proposed new spinnaker pole outer end fitting

Postby Rick » Sat Oct 07, 2017 10:39 pm

Bruce wrote:OK think this needs to made very clear, as others I have spoken to also assumed the pole would be cut to give the same exit point for the tack line as the current solution.


I think if you did that you'd be cutting through the cut out for the block giving you a split end which wouldn't be good.

If we go for this then it's a simple inexpensive change which hopefully is beneficial to those prone to getting the tack line wrapped round the pole, typically the sailors who capsize more, sometimes happens when recovering the kite whilst capsized.

Also, if we started allowing DIY pole shortening I fear there would be mishaps :?

Last time we voted on this the vote went against but there seems more interest this time. We will see.
Rick Perkins. GBR

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Re: Proposed new spinnaker pole outer end fitting

Postby Dennis_W » Sat Oct 21, 2017 7:58 pm

Would a potential solution be that all new boats and poles are supplied with the proposed new end fitting but the poles are shorter to maintain the same point the tack line comes out and not allow existing poles to be modified?

It would remove any benefits from a longer pole and any issues arising from retrofitting old poles. I think the cost of a current new pole is £325, so the cost of changing pole significantly higher than a retrofit modification but it would be more inline with the one design principles of the class and lower risk for preventing equipment failures.

I’m for the proposed change as it removes one thing that can go wrong and be an absolute pain.

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Re: Proposed new spinnaker pole outer end fitting

Postby paul manning » Sun Oct 22, 2017 9:36 am

Hi Dennis

If the proposed bowsprit solution is adopted, all new boats would be supplied with the same end fitting and same total length.
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