Swallow Yachts Forum > Technical

Jibboom and Spinnaker

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Graham W:
I can see that I am going to end up with rather more than the three standard sails!

Tony:
Hi, Claus.
I like the look of your Jib/spi  boom and wonder if I could adapt it for the Four Sisters?
My  jib, originally designed to replace the balanced lug main in heavy weather – which it does very well – can give me an extra knot and help the boat point higher when flown WITH the lug sail, especially when going to windward.  It overlaps quite a lot, obviously, but gives a marvellous slot effect. It would be convenient to carry it on a jib furler ready for use but it just manages to foul the yard when tacking.  A short bowsprit would solve the problem – but I hate the things when mooring so want to make it instantly removable.
Your jib boom, fixed to the mast in some way and with a decent waterstay could well be the answer. It wouldn’t take much to fit and remove, it could carry the jib furling line and it would keep the fore deck clear for mooring ropes, too.
What do you think?

Graham W:
Tony,
Here are a couple of links to useful discussions on securing bowsprits, whether secured to the deck and sliding through a deck-mounted hoop of some kind, or hinged.
http://www.cruisersforum.com/forums/f55/bowsprit-with-hinges-29978.html
http://www.classicmarine.co.uk/Articles/Bowsprit%20Article.htm
I am going to install a Claus-inspired extended jib boom on my BR and am already wielding my angle grinder on a carbon spar.
Graham

Craic:

--- Quote from: Tony on 18 Jun 2011, 16:16 ---Hi, Claus.
I like the look of your Jib/spi  boom and wonder if I could adapt it for the Four Sisters? ... What do you think?

--- End quote ---

Hi Tony.
Excellent drawings. The lower drawing shows what I do when I fly the spinnaker. Tying the boom aft to the mast not only limits the sideways movement of the boom but also conveys the forward pulling forces of the spinnaker to the hull.
I do think a jib clubboom like mine would solve your jib/bowsprit problems. It is simple to build, all you need is a good piece of knot-free wood, some rope, and a strong swivel. You have the furling drum I suppose.
But then, your boat may loose weather helm in light winds. If so, you may compensate some by raking your mast further aft.
Trying out something new like this is experimenting, if you give it a try do be back here how it went. C.

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