29er GBR 074 Tynemouth |
Laurent Giles 'Jolly Boat' Exeter |
J24 (Sail No. 4239) Dartmouth |
List classes of boat for sale |
12ft skiffs develop a new boom vang setup |
Post Reply | Page 123> |
Author | |
jimmywalsh
Newbie Joined: 08 Oct 04 Location: Australia Online Status: Offline Posts: 20 |
Post Options
Quote Reply
Topic: 12ft skiffs develop a new boom vang setup 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. |
|
jimmywalsh
Newbie Joined: 08 Oct 04 Location: Australia Online Status: Offline Posts: 20 |
Post Options Quote Reply Posted: 06 Mar 06 at 7:54am |
|
|
jimmywalsh
Newbie Joined: 08 Oct 04 Location: Australia Online Status: Offline Posts: 20 |
Post Options Quote Reply Posted: 06 Mar 06 at 7:56am |
|
|
MikeBz
Really should get out more Joined: 21 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
Post Options Quote Reply 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 |
|
jimmywalsh
Newbie Joined: 08 Oct 04 Location: Australia Online Status: Offline Posts: 20 |
Post Options Quote Reply 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. |
|
MikeBz
Really should get out more Joined: 21 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
Post Options Quote Reply 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 |
|
jimmywalsh
Newbie Joined: 08 Oct 04 Location: Australia Online Status: Offline Posts: 20 |
Post Options Quote Reply 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 |
|
Presuming Ed
Really should get out more Joined: 26 Feb 05 Location: United Kingdom Online Status: Offline Posts: 641 |
Post Options Quote Reply 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.
|
|
Norbert
Far too distracted from work Joined: 31 Mar 04 Location: United Kingdom Online Status: Offline Posts: 351 |
Post Options Quote Reply 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.
|
|
Isis
Really should get out more Joined: 01 Sep 05 Online Status: Offline Posts: 2753 |
Post Options Quote Reply 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. |
|
Post Reply | Page 123> |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |