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I've already built my Skerry and would like to covert to a Lug sail. John Harris mentioned that the mast had to be moved towards the stern 6 inches. Any ideas as to how this may be accomblished without changing the original mast step? I also have another question. How are the new yards attached to the mast? Does anyone have some pictures? Mike
7 replies:
RE: Balanced Lug sail for skerry
Oops, I meant mast partner, not collar. The partner is the top mounting hole itself, the collar is what is (on a yacht say) is used to seal the gap between the mast and the partner, to stop water entering the cabin (typically a rubber gasket/boot-thingie).
Damn, and I was feeling so salty there for a while! ;)
RE: Balanced Lug sail for skerry
I also had heard that the mast had to be stepped 6" further aft when using the balanced lug rig. I had some correspondence with John and he has determined that the balanced lug will work fine in the plan location. Perhaps he can chime in on this.
Bill
RE: Balanced Lug sail for skerry
Im thinking about the balanced Lug for my Skerry also.
It currently has the standard rig with sprit sail.
would this same sail work on a balanced lug rig?
and can I leave the mast stepped in its same location?
RE: Balanced Lug sail for skerry
>>>>I've already built my Skerry and would like to covert to a Lug sail. John Harris mentioned that the mast had to be moved towards the stern 6 inches.>>>
I've never said THAT! That would be a structural mess even if it were necessary.
I dug around and found some recent correspondence with a builder, with illustrations, helpful to the conversation about Skerry lug rigs. Pasted below:
>>>>>>>
The traditional calculation for proper balance states that the sailplan's center of effort should be placed 10% of the waterline length forward of the quarter-chord point on the center of lateral resistance, if the boat has a well-defined fin like the Skerry. Forward of 10% equals more lee helm; less than 10% equals more weatherhelm.
John
RE: Balanced Lug sail for skerry
Thanks John for the excelant reply.
Im a little rusty on my nautical design nomenclature.
So Would you dumb it down for me a bit and tell me which of the above pictures will sail good.
Ha!
ALso Is the sail I have ok to use as a balanced lug?
Mine looks like the sail in the picture but I dont have exact measuremnts.
RE: Balanced Lug sail for skerry
» Submitted by - Wed, 8/11/10 » 7:11 PM
Re moving the mast step (or do you mean the mast collar - the upper hole in the forward deck you pass the mast through before 'stepping' it in the step - the piece on the floor), the easiest way is probably just epoxying in a new one a few inches aft of the current one.
If you meant the collar, one way to do it would be to make a removable thwart that clamps on the gunwales. That's common on sailing canoes, so they can convert back and forth from sail to paddle.
Re gigging a balance lug, here's a comprehensive page:
http://www.amateurboatbuilding.com/articles/howto/lugsail/lugsail.html
But personally, in terms of the upper parrel and halyard arrangment, I think the following is a much better solution, by Michel Storer (look for the part called "The Mainsail Halyard", where one rope, the halyard, holds the sail up, and holds it against the mast:
http://www.storerboatplans.com/GIS/GISRigging.html
I hope that helps.