Anonymous wrote:
Wow, congratulations!
Talking about showing off the camber! I hope you will give us a bit more info on the rig, dimensions , areas, dept of camber, battens and mast in use, etc...
I also liked those solar panels.
Arne
Hi Arne, here is the info you want to know.
Johanna style HM sail, built using the shelf foot method. Luff and leach done in traditional sailmaking style. Designed camber is 8%, actual camber about 10%. Camber profile as per the info that Slieve sent Alan Martiensson. Max camber at 37% and slight hollow in the aft part.
Material: Odyssey III
Aspect ratio: 1.7
Lead: 12%
Sail area: 330 square feet
Yard: 100 x 3 6060 T6 aluminum tube in a sleeve.
Battens: 50 x 1.6 6060 T6 aluminum tube except for the lowest (boom) batten which is 50 x 3 6060 T6 Sail is laced to the battens.
Control lines: Halyard, Sheet, Yard hauling parrel, one running luff parrel starting on batten 2, leading to batten 3 and then down. Batten parrels on all battens and the yard. The standing part of the halyard is attached to the yard 500mm aft (10% of yard length) of the block (which is attached at the center). This is now my standard way of doing the halyard yard attachment. It means I do not need a THP. I expect to put in one or two standing luff parrels but have not done so yet.
Sail is low aspect as we were using the carbon fiber mast originally made for Zane's previous boat Partisan (a 21ft JOG racer). So far the boat has only been sailed in light airs (up to 15 knots). The helm has been close to neutral over all courses (windward, reaching & running).
I expect that she will show a bit more weather helm when in stronger winds but so far in winds up to 15 knots the helm has been almost neutral.
Sail still needs a little tweaking but it setup very easily. I basically just attached the required lines and the sail just fell into position.