A Photo & Discussion Forum for Wharram Design Enthusiasts
go for a one mast version and attach the point of the triangle on the base of the mast. use the space in the front for a jib. .... like we and hans did. our boats sail like a dinghy and yours will do it too. a 21 feet boat is to small for two masts. you will have no deck space anymore. i am not sure if a cheap solution is a better solution. use a crab claw because you like the performance. and you will see, it is reliable and a lot fun.
Still working on optimal combinations of mast (bamboo or Al) and sails here in Seattle. Here's a couple links to recent experiences with the crab claw rig:
Our next steps are trying a Wakataitea style halyard system on our bamboo mast, getting a stronger (Al) 21' mast to open up more rig/rigging options, making a maststep system to experiment with mast position between center and forward beams, and making another crab claw sail with stiffer spars (wind surfer masts?).
Well it's been too long, but here at last is a history of the last few years of experiments with crab claws on our Tiki 21, Milagra.
The halyard and sheet attachments have worked well (no further breaks of the bamboo spars), and the polytarp and bamboo have held up. The Race to Alaska is inspiring us to try out some new spar materials and make some new sails, so stay tuned for more data from the Pacific Northwest.
We'd love to hear from anyone who has succeeded in getting crab claws to point well (tacking through less than 120 degrees), particularly in light winds. Follow our crab claw experiments on our race boat -- a Hitia 17 -- here: