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Thread: GIS Yawl
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4th February 2015, 10:20 PM #511Member
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So, what's the current "state of the art" on the GIS yawl rig? Do the plans at the link above incorporate the current best practices? Just took delivery of a 12" aluminum tube, so it's on my mind.
Thanks all,
Brian
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4th February 2015 10:20 PM # ADSGoogle Adsense Advertisement
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5th February 2015, 08:16 AM #512Senior Member
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There have basically been two approaches to the yawl rig modifications. Clint's as detailed above, which involves putting an extra mast position foreward of bulkhead one and putting the mizzen through the aft tank.
I did mine differently, left the main mast in it's original position, and stepped the mizzen on top of the aft tank with a partner at the top of the transom.
I modified my centreboard case, making it wider at the top so I could angle the underwater part of the centreboard back to get things in balance. I also set my main sail about 150 mm further forward on the mast when I have the mizzen. With an already built boat, you could build another slightly narrower and perhaps longer centreboard and cut some away from the front top corner of it so it can angle back more in the standard centreboard case.
I've been happy with the way I did it, I can get the boat balancing nicely with the mizzen up with the main mast in the original position. My aims from doing it the way I did were to minimise modifications that add extra work and weight, but especially I didn't want to do anything that could potentially compromise the integrity of those buoyancy tanks. Clint's alu tube though the buoyancy tanks for the masts should be OK if you do it strongly enough, but there's a lot of strain at the base of an unstayed mast, any flex and I can imagine that bond between the alu tube and the epoxy cracking. I'd be more confident in the long term reliability of a 4 or 5 mm wall fibreglass tube epoxied in place as then all the bonds are epoxy composite-epoxy-wood.
Perhaps Mik can come along and give his thoughts on current 'state of the art' here.
Ian
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8th February 2015, 12:30 PM #513
I don't think Clint intended the tube to take any of the mast's load. There should be a forward step as robust as the original.
I didn't use a tube given my hollow square mast. Instead, I boxed the the step and partner together using off cuts of ply. The key to either approach is getting a good limber hole that drains into the main cabin.
As Ian said, plenty of additional work. I enjoyed the challenge of it; I still haven't built the mizzen rig yet!
Sent from my iPhone using TapatalkDave
StorerBoat Builder, Sailor, Enthusiast
Dave's GIS Chronicles | Dave's Lugs'l Chronicles | Dave's StorerBoat Forum Thread
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