Project Carbon Bowsprit...finished!

Iain C

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Some of you may remember this thread...

http://www.ybw.com/forums/showthread.php?350887-Show-me-your-bowsprits!

Well, after a few outings with the new cruising chute, I decided that the bowsprit would definitely make things a lot easier. The tack line was getting caught round the furling drum and nav lights, and it occassionally fouled the rolled up genoa on the gybes, so I decided to push ahead with a carbon pole that could be removed when nesessary. Original plan was for a Selden bow ring, but there was'nt enough room on the foredeck, what with a chunky samson post, a deck stowed anchor and a windlass.

I used a bit of mast from this boat...pictured in happier times at an event at Rutland before the mast got trashed during a storm when the boat was ashore...

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(In actual fact, we also got 5 seconds of fame at 5:20 in this promotional film of Rutland http://www.youtube.com/watch?v=B-ZeDLEsHzA)

A test fitting of a piece of mast gave encouraging results, and the plan was to have a slightly offset bowsprit, angled so the end was on the centreline, and some kind of fixing at the inboard end. The outboard end would have an additional piece that would drop into the bow sheaves (no rollers on a Sabre) and be held in place with an 8mm pin.

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I then ground the track off, filled it with bog, and bogged a piece of acetal bar (left over from last winter's new rudder bearing) on the bottom to be the "roller" that locates in the sheave (I still need to drill the hole when I get down to the boat!). This was then filletted in, and then I would round lots of both kevlar and carbon tow to keep the two together. Then about 3 layers of carbon twill were added to the join and finally the whole thing was wrapped in plain weave carbon. A friend got some delrin endcaps turned up at work, a hard eye was through bolted at one end, and a dinghy spinnaker pole end fixed at the other end. A stainless eye will be mounted onto a threaded bar which will be sikaflexed and bolted through the deck, and a system of snapshackle blocks will quickly convert the symmetric kite pole downhaul into the tack line for the asymm.

Only cost was the pole end (£11), and the blocks (got 5 good second hand ones for £30 from this forum), everything else was kicking around in the man-shed and might-come-in-useful-one-day box.

The extensive testing programme consists of the Round the Island Race this Saturday...let's just hope it works! And if anyone asks, yes, that is a carbon fibre bowsprit on a Sabre 27...:cool:

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Congratulations. Those broken carbon fibre masts are a great source of poles. I am also pleased to see that you agree with me that kevlar and carbon are good materials for amateurs to use in layups. I use a CF piece of mast as a boom and a cf windsurfer mast piece for spin pole. I would love to have a cf mast on the little boat but that would probably cost as much as she is worth.
good luck with that RTI around Isle or Wight. It is a race that would inspire me with the little boat if only I were younger and 10000 miles closer. olewill
 
so if you are going to use this on the round the island

- what happens about your handicap?

- will you declare it?

and above all....

the very best of luck to you

I hope to do it one day - although hopefully not in my boat as being in charge would frighten me to death

but if anyone has room for a cameraman one year

D
 
Thanks for the feedback everyone.

Dylan, yes I will be using it (assuming I can get it fitted on Friday night!) and I have already declared both my symmetrical spinnaker and the cruising chute. The entry form doesn't ask about bowsprits, and if we're honest it won't really make any difference to boatspeed, it's more for ease of gybing. The chute fits the boat without the pole, and much as I'd love a dirty great big asymm that needs a pole to get it to work, I suspect my keel and rudder would say "you're kidding, right?"
 
Thanks for the feedback everyone.

Dylan, yes I will be using it (assuming I can get it fitted on Friday night!) and I have already declared both my symmetrical spinnaker and the cruising chute. The entry form doesn't ask about bowsprits, and if we're honest it won't really make any difference to boatspeed, it's more for ease of gybing. The chute fits the boat without the pole, and much as I'd love a dirty great big asymm that needs a pole to get it to work, I suspect my keel and rudder would say "you're kidding, right?"


first round the needles then -

D
 
Ooooo.... that's a good idea.... what end fittings do you use?... have you managed to find anything that fits the standard 48.5mm id?

The windsurfer mast is taper so I am actually using the smaller end of a broken pole.
I use these type pole ends which are bolted inside the tube.
http://www.biasboating.com.au/Stainless_Spinnaker_Pole_End_p/8169.htm
The pole is very light takes a fair bit of bend but my use sees it susceptible to skying the pole which bends the fittings horribly when it happens. These fittings are really for dinghies but I find OK (just ) for 21ft TS. The advantage is that you can snap them on to sheet or snotter without pulling the trigger string. Of course the whole pole is very light. Ideal for whisker pole on a larger boat.
Using the fatter end would be better for a bigger boat. Using KB type end fittings. If you have a complete WS mast then you can cut off the pole where the diameter is correct for one end. At the other end it will be either too big ore too small. You could possible fit the pole inside the fitting or use carbon fibre cloth to make a flange to fit the fitting. good luck olewill
 
I hope to do it one day - although hopefully not in my boat as being in charge would frighten me to death

but if anyone has room for a cameraman one year

You can have a spot on mine next year. Keeping it to just three of us this year as the other two are fairly tall chaps. Gets crowded on a small boat...

Good work on the pole there Iain - looking tidy :)
 
Well...it's fitted and it works. It actually seems very strong indeed...before trying the kite I tied a loop in the halyard near the mast foot, put both feet in it and bounced up and down and there was no deflection whatsoever. Happy days!

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Does your boss know that you're playing with your boat? ;)

Will you be at the club on Friday night or in Cowes?
 
Finally got some on the water pics...just to prove it works! Excuse the slight swig of beer in pic 2, it was my birthday (and I was sober!)

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