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12ft skiffs develop a new boom vang setup

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jimmywalsh View Drop Down
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    Posted: 06 Mar 06 at 7:53am
Stolen openly from the boom that appeared on the 5.5m class yacht Jono Temple has adapted it to provide a revolutionary vang system that

1. Frees up space in the boat
2. Is simple to retro fit
3. Provide more purchase - the angle for the pulleys is 90 to the lever not 45 as per normal vangs
4. Is light
5. Doesn't effect the mast bend the way a ram vang does
6. Requires no extra mast support wires
7. And it works
8. Would work on Alloy booms
9. Would also work on yachts

The front strut takes all the comression so should be strong and the back struts are in tension so could be replaced by PBO if you are a weight Nazi. There is more bending moment on the boom so would be worth adding carbon uni on top if your boom bends sith a normal vang.

I have a feeling the Temple Vang will spread like wildfire, remember you saw it here first.
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jimmywalsh View Drop Down
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Post Options Post Options   Quote jimmywalsh Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 7:54am
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jimmywalsh View Drop Down
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Post Options Post Options   Quote jimmywalsh Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 7:56am
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MikeBz View Drop Down
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Post Options Post Options   Quote MikeBz Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 8:57am

How is this significantly different from just moving your conventional kicker attachment point forward until it's only 8-10" from the gooseneck?

Surely the boom is going to have to be massively beefed up to take all the kicker load so close to the gooseneck.

Mike

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jimmywalsh View Drop Down
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Post Options Post Options   Quote jimmywalsh Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 9:17am

The further you move your kicker/vang attachment point forward the more purchase you need to get your leech tension and the greater vertical load on your goosneck.  This treats the whole boom and vang as one spar and the purchase required is less as the adjustment is at right angles to the spar.

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MikeBz View Drop Down
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Post Options Post Options   Quote MikeBz Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 10:55am

OK, I can see that the length of the vang 'spar' (for want of a better description) gives you leverage, hence you need less purchase than for an equivalent string & pulleys kicker (oops, vang) attached to the boom at the same point.  However, the boom will still need to be massively strong in this area because of the lever arm that the leach tension has over the vang attachment (simple ratio of the distance from the pivot (gooseneck) to the vang vs. the distance from the vang to the clew of the mainsail - or more correctly to the centre of effort of the mainsail?).

Mike

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Post Options Post Options   Quote jimmywalsh Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 11:10am

Our booms are very very stiff

Most boats use the CST 95 x 39.5 x 2.2 wall elliptical boom

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Presuming Ed View Drop Down
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Post Options Post Options   Quote Presuming Ed Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 1:02pm
Similar to the system that's been on the XOD that my dad sails. Think it's been on the boat for at least the last 5 years. Minor difference is that on the X, there is a bit L shaped aluminium plate which hangs beneath the boom to take the loads, rather than being built in - not allowed, and tricky with wooden spars anyway.
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Norbert View Drop Down
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Post Options Post Options   Quote Norbert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 1:15pm
What about stainless steel / aluminium / carbon fibre (which ever) boomerang going from the conventional boom position with the v part of the boomerang angled towards the mast and the tensioning block and tackle at the base. Creates space adds weight.
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Isis View Drop Down
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Post Options Post Options   Quote Isis Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 06 at 5:39pm
Ive been toying with whether or not to gnav or vang my new rig since about november and after spending about 3 hours talking to the guys on the I14 stand on sunday and a chilli fueled debate with half the cherub class the night before id finaly decided im going for a gnav.

Not anymore sir.
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