Re: Leg-o-mutton mast question.
SURF plans specify 1 3/4 in. square, minimum. On several boats I have used this sail on a round mast, 2 inches at the bottom, set into a length of PVC pipe from step to just above the partner. The areas at the base are 3.0625 and 3.14 sq. in., respectively, so I feel comfortable with 2" diameter.
Dimensions, expressed in tenths of an inch, starting at the peak and each two feet down are: .875 (7/8-), 1.285, 1.57, 1.786, 1.93, and 2 inches continuing to the bottom. Build from two pieces 3/4 in. with a 1/2 in. between. Stagger all scarfs. The sail luff is 14' 3", allowing for stretch, so suggest you make the mast 16 feet, then cut off a bit later if needed.
Works fine for me.
Joe T
Dimensions, expressed in tenths of an inch, starting at the peak and each two feet down are: .875 (7/8-), 1.285, 1.57, 1.786, 1.93, and 2 inches continuing to the bottom. Build from two pieces 3/4 in. with a 1/2 in. between. Stagger all scarfs. The sail luff is 14' 3", allowing for stretch, so suggest you make the mast 16 feet, then cut off a bit later if needed.
Works fine for me.
Joe T
--- Inbolger@yahoogroups.com, "kd" <kadonohue@...> wrote:
>
> I would like to use the leg-o-mutton 59 sq. ft. sail and mast on my own design. I have noted that the mast thickness is either 1 3/4" max. or 2 1/2" max.
> I am using the info from Payson's books, Gypsy, Cartopper, June Bug, etc. I thought that maybe the skinnier boats used the thinner mast, to allow more flex to spill wind. But this does not is not the case. Any ideas why the variance?
> Thanks
>
> I would like to use the leg-o-mutton 59 sq. ft. sail and mast on my own design. I have noted that the mast thickness is either 1 3/4" max. or 2 1/2" max.The heavier and stiffer a boat is, the stronger the mast has to be. When hit by a gust, a tipsy, lightweight boat will heel to relieve the stress, but heavy, stiff boat won't. For the same reason, a multihull has to have a stronger mast than a monohull with the same sail area.
> I am using the info from Payson's books, Gypsy, Cartopper, June Bug, etc. I thought that maybe the skinnier boats used the thinner mast, to allow more flex to spill wind. But this does not is not the case. Any ideas why the variance?
In one of his essays (I forget where), PCB gave a hint at the requirement saying it depended on the boat's inertia.
That's a puzzle. I used the 2 1/2" and it worked well on my Bolger Brick. I saw an Elegant Punt and the mast looked like a toothpick!
I would go with the thicker specification.
Reed
I would go with the thicker specification.
Reed
I would like to use the leg-o-mutton 59 sq. ft. sail and mast on my own design. I have noted that the mast thickness is either 1 3/4" max. or 2 1/2" max.
I am using the info from Payson's books, Gypsy, Cartopper, June Bug, etc. I thought that maybe the skinnier boats used the thinner mast, to allow more flex to spill wind. But this does not is not the case. Any ideas why the variance?
Thanks
I am using the info from Payson's books, Gypsy, Cartopper, June Bug, etc. I thought that maybe the skinnier boats used the thinner mast, to allow more flex to spill wind. But this does not is not the case. Any ideas why the variance?
Thanks