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loud cracking sound #118653
09/27/07 08:51 AM
09/27/07 08:51 AM
Joined: Feb 2006
Posts: 3,348
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fin. Offline OP
Carpal Tunnel
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I bent my spinnaker pole over a year ago. It worked fine but looked a little funny so I decided to "fix" it. It will be much easier to store now.

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Re: loud cracking sound [Re: fin.] #118654
09/27/07 08:58 AM
09/27/07 08:58 AM
Joined: Feb 2006
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fin. Offline OP
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. . . I was thinking of repairing it with a sleeve set in thickened epoxy. Any thoughts?

And since it is already "fixed", is there any way to make it sectional and functional (I already have the sections)?

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Last edited by Tikipete; 09/27/07 09:06 AM.
Re: loud cracking sound [Re: fin.] #118655
09/27/07 09:32 AM
09/27/07 09:32 AM
Joined: May 2003
Posts: 4,451
West coast of Norway
Rolf_Nilsen Offline
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Sectional, sure it is. Just do the sleeve like you mentioned and glue the sleeve to just one of the ends. The rivets will have to go tough, so you must think up something new there. Perhaps laminate the eye to the sleeve instead.

Re: loud cracking sound [Re: Rolf_Nilsen] #118656
09/27/07 09:40 AM
09/27/07 09:40 AM
Joined: Feb 2006
Posts: 3,348
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fin. Offline OP
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I think the eye can be eliminated. If memory serves, the Taipan 4.9 uses a sling instead.

Re: loud cracking sound [Re: fin.] #118657
09/27/07 09:44 AM
09/27/07 09:44 AM
Joined: Aug 2005
Posts: 2,921
Michigan
PTP Offline
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yeah, I don't think you need the eye really. A little piece of spectra maybe.

Re: loud cracking sound [Re: fin.] #118658
09/27/07 09:48 AM
09/27/07 09:48 AM
Joined: Jun 2001
Posts: 9,582
North-West Europe
Wouter Offline
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Just get a smaller diameter alu tube that fits inside. 1 mm difference between the tubes is enough and practical. The longer you make the sleeve the more tight the fitting becomes especially when the tube is bend slightly like when you do pretensioning the spi pole.

On landyachts were we use masts that are made up out of at least 3 independent alu sections the sleeved overlaps are nearly always 150 mm. (halve a foot) That seems to work well enough.

In your case make the (internal) sleeve permanent on the pole that takes the eyestrap for the bridle strut. The two bolts or monel blind rivets you use for the eyestrap will also secure the sleeve. Smooth out the ends where the breakage occured by sawing off a small piece and VOILA you have a collapsable spinnaker pole, very nice for transporting the boat.

The pole tip wires will keep the front tube secured to the sleeve by compression.

Hell, come to think of it I might even get such a setup myself. Will allow me to remove the snuffer ring a bag and not have them degrade in the weather 6 months a year.

Wouter


Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands
Re: loud cracking sound [Re: Wouter] #118659
09/27/07 10:32 AM
09/27/07 10:32 AM
Joined: Aug 2007
Posts: 31
San Francisco, CA
ubicomp Offline
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San Francisco, CA
Ummm, dare I ask the obvious? How much is a new spin pole?

Re: loud cracking sound [Re: ubicomp] #118660
09/27/07 10:46 AM
09/27/07 10:46 AM
Joined: Aug 2005
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Michigan
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Quote
Ummm, dare I ask the obvious? How much is a new spin pole?

he has a new one, this is the old one I assume he will use as a backup

Re: loud cracking sound [Re: ubicomp] #118661
09/27/07 11:10 AM
09/27/07 11:10 AM
Joined: Feb 2006
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fin. Offline OP
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Quote
Ummm, dare I ask the obvious? How much is a new spin pole?


Not much. The length is 10'+. That is a pita to rig and stow. Since I have lemons, I thought I'd make lemonaide. (The only thing broken is the tube, all the attached hardware is fine. BTW- the original damage is from inadaquate preparation. I was in too big a hurry to get on the water.)

Re: loud cracking sound [Re: fin.] #118662
09/27/07 12:58 PM
09/27/07 12:58 PM
Joined: Jun 2001
Posts: 9,582
North-West Europe
Wouter Offline
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Go for it Tikipete !

You could start a trend and in a few years all new boats will come with sleeved spi poles.

If it works for landyacht masts (MUCH higher loaded) then it must certainly work for spi poles.

In case my other post wasn't clear enough. In landyacht masts the tricks is as follows.

They only get tubes that have a outer diameter that can be devided by 5 and that have a wallthickness of 2 mm. With these you are always certain that you can find an adequate sleeve in getting a tube that has an outer diameter of 5 mm less then tube you want to sleeve.

1 mm difference = 0.5 mm space on either side between the tubes is practical when the tubes gether salt, dirt or small damaged spots. Probably 0.5 mm = twice 0.25 mm would be perfect but such tubes are not part of the standard extrusion package and therefor are custom orders. And the 1 mm difference setup works out quite well in stiffness and strength already.

If for some reason you want to sleeved tube to sit more straight and more tightly then just use electrical tape to place two bands on the exposed inner tube, spaced something like 100 mm apart. Basically close to either end of the exposed sleeve. This takes out most of the slack. You'll have to experiment a little with the tickness of tape. You can also cover the whole sleeve with tape but this setup can be tricky to seperate if you do it wrong or alot of dirt/salt gets in there. And two bands of tape works just as well as coverong the whole section.

I hope this is clear to everybody.

Hey Tiki,

Just measured my own pole and I can do such a setup myself as well. But best of all I thought of the following. Instead of completely seperating the two sections one can actually just unlock the two tubes and flip the front end over backwards and just store this whole package (incl. the spi that remains in the sock) as one item (in a trailer, sailbad or shed). One can leave the retrieval line and sheets attached. Basically cutting down massively on spinnaker (de)rigging time. Just fit the pole, unfold it and put the front end over the sleeve and then run the top halyard (other end of retrieval line) up the mast. Also the spinnaker can never be tied on wrong ever again.

Wouter

Last edited by Wouter; 09/27/07 01:04 PM.

Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands
Re: loud cracking sound [Re: fin.] #118663
09/27/07 05:46 PM
09/27/07 05:46 PM
Joined: Jul 2006
Posts: 1,147
Bay of Islands, NZ
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warbird Offline
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Bay of Islands, NZ
I just bought a carbon fibre windsurfing most for a pole....they come second hand for as little as $100. they are already sleaved.....???

Re: loud cracking sound [Re: Wouter] #118664
09/27/07 09:38 PM
09/27/07 09:38 PM
Joined: Jun 2001
Posts: 778
Houston
carlbohannon Offline
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Houston
Quote
You could start a trend and in a few years all new boats will come with sleeved spi poles.


Sounds like an 18 sq I used to sail with. Everytime he broke the mast, he sleeved it. He always claimed he always claimed he was testing and reinforcing the weak points.

Re: loud cracking sound [Re: carlbohannon] #118665
09/28/07 05:56 AM
09/28/07 05:56 AM
Joined: Feb 2006
Posts: 207
couldn't resist it
Codblow Offline
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Posts: 207
couldn't resist it
Think a carbon two piece sleeved pole is standard on STealth , certainly I got one and its a great boon to break it down and put in box for travelling , 2yrs sailing in all winds has proved it up to the job

Re: loud cracking sound [Re: Wouter] #118666
09/30/07 02:33 PM
09/30/07 02:33 PM
Joined: Feb 2006
Posts: 3,348
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fin. Offline OP
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It works so far. Keeping it simple, I got a 16" piece of anodized aluminum with a very thick wall and bedded that in with silicon. I decided epoxy was over-kill. I wrapped the joint with rigging tape, because it was thicker and more rubbery and doesn't have the gooey adhesive of duct tape or electrical tape. I didn't fly the spin because there was W-A-Y too much wind for me, but the rig did survive a fairly radical pitch-pole.

I did nothing to the other end, just filed it flat and took off any sharp edges.

$3.00 for the alu sleeve; $1.50 for the silicon; the tape I already had on hand.


Attached Files
119945-MVC-326S.JPG (58 downloads)
Last edited by Tikipete; 09/30/07 03:17 PM.
Re: loud cracking sound [Re: fin.] #118667
09/30/07 05:24 PM
09/30/07 05:24 PM
Joined: Jun 2001
Posts: 9,582
North-West Europe
Wouter Offline
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Ohh, you'll be happy with this setup for a LOOOOONG time to come.

It will hold.

Wouter


Wouter Hijink
Formula 16 NED 243 (one-off; homebuild)
The Netherlands

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