Great thread.
Kim,
Very neat. Problem with a carbon mast is that the inside is not always perfect, so internal sleeves are hard work. Solution is a male mandrel, but these have their problems as well, particularly for amateur builders.
Arto,
Do you mean one rig in each hull? No structural reason why not, but it takes a lot of space out of the windward hull. Famous cat designer is currently drawing a (full bridge deck) proa like this.
Gardner,
Great logic on design parameters! ;-) High aspect ratio is good, but the complexity of two easy rigs would overcome the benefit from the extra sails. Two piece masts are far simpler, particularly as they would not need to be cut until you decided to ship the boat. Wing masts are also a better performance solution than tube masts.
Rudolph,
Booms built the way Sol2's lee hull was built will be very quick, especially if the table is already set up. An unstayed mast for an easy rig, una rig or swing rig will all take about the same time to build, and the bearings for a rotating rig are probably less hassle to install than the bearings/parells/whatever on the Swingrig. I like the Swingrig idea, but it is going to be a lot heavier, and/or more expensive than a conventional rig, with more to break. Be great if someone put one on a harry to see how it works on a higher performance boat than the Wharram.
Robert,
Suspect the swing wing mast should be non tapered, or you will have jamming/rattling issues.
For what it is worth, Sol 2 is having a 600mm/2' chord wing mast, built from 5 (bottom forward, bottom aft, sheer web, top for'd, top aft, all infused at the same time using 3mm foam, tow and carbon cloth) flat panels, bent and glued together. Less tow, more foam than a tube mast, and the sail track is easily integrated.
The first rig will be a fully battened main with control lines 2/3rds of the way along the battens to "spreaders" on the mast, then down the trailing edge. The spreaders will go up and down with the sail. Hopefully controllable shape and twist without long sheets and the huge halyard and leech loads, and associated expensive sail cloth required on a conventional wing masted sail.
Another option for a balanced rig is to rake the mast forward. This is being tested on one of the China built harriettes. Has the added advantage of helping to right the boat.
Rare Bird back in the water this month with new stainless pintles. Mark fixed the rudders, Col has repaired the mountings
rob
Robert,
Suspect the swing wing mast should be non tapered, or you will have jamming/rattling issues.
For what it is worth, Sol 2 is having a 600mm/2' chord wing mast, built from 5 (bottom forward, bottom aft, sheer web, top for'd, top aft, all infused at the same time using 3mm foam, tow and carbon cloth) flat panels, bent and glued together. Less tow, more foam than a tube mast, and the sail track is easily integrated.
The first rig will be a fully battened main with control lines 2/3rds of the way along the battens to "spreaders" on the mast, then down the trailing edge. The spreaders will go up and down with the sail. Hopefully controllable shape and twist without long sheets and the huge halyard and leech loads, and associated expensive sail cloth required on a conventional wing masted sail.
Another option for a balanced rig is to rake the mast forward. This is being tested on one of the China built harriettes. Has the added advantage of helping to right the boat.
Rare Bird back in the water this month with new stainless pintles. Mark fixed the rudders, Col has repaired the mountings
rob
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