A Photo & Discussion Forum for Wharram Design Enthusiasts
Hi,I am building a melanesia and am just about done with the main hull. Next the outrigger ... recently I picked up a surf ski from a hard rubbish collection. It is very narrow perhaps 350 mm wide and 4.8m in length. The thing I a wanting advice on is as I a shortening the ski, should I use the front section or the rear. The bow is more full in shape and has an upswept skirt like a flared bow to prevent the ski conserving. The rear end is very fine, designed to leave a clean wake and provide long-distance to wavelengths the ski. So the full and flared bow to skip along the surface vs the fine stern section sleek and wave piercing ? I have n experience sailing outweighed or proa, so have no leanings. Please feel free to comment Tia.
My experience with outriggers is limited but my trials with a pvc pipe recommend a voluminous float.
Check out the photos: the hull is a kayak, the float is a 2m tube with 10cm diameter so the volume is about 15 liters. This is nice to train your sailingskills and balance and any mistakes get an immidiate feedback (you really get a good sense for gusts).
But for real sailing the float is far too small. So next time i would take a considerably bigger one. So in your situation the fuller bow might be the better choice. ?
Note that the bow of the float is mounted higher than the stern, this arrangement worked very well.
I wish a lot of fun fiddling about
Hey Shaun and Pius,
Thanks for the ideas. Looks like 2 votes for the bow and lots of encouragement for experimenting/messing about. Sounds like fun.
Pius, your kayak outrigger looks very speedy :))
Terry: Having sailed only once on a'Melanesia' but having many years experience building and sailing outrigger canoes,I feel qualified enough to chime in............it is not a bad idea to use the ski as an ama -- that is in order to save time in building and to get out on the water quicker, and in which case I dont see the point in modifications mentioned. You will have enough to do in creating attachment points for fixing to the connecting booms. This is of course if you intend primarily to sail the craft. Otherwise a lower volume ama will be way better for paddling, and in which case stick to the plans and make a low volume wooden ama.
If sailing is the main objective, then the 'duck billed bow' will not be bad at all, and the more volume in the ama the better.
You maybe need to be aware that a tacking double hull is essentially a catamaran when sailing, despite the unequal size hulls -- take a look at Hans Klaar's Ontong Java; which sails no differently to a catamaran.
Moving the rig to one hull, like a proa, is only going to make a small performance difference depending on whichever tack. Whereas a low volume ama needs to be kept to windward at all time to prevent it submarining.
'Melanesia' is possibly an unfortunate name for the Wharram designed craft, because Melanesian craft are on the whole unmistakeably double ended and designed for shunting rather than tacking. Tacking is the way that Polynesian craft come about, except of course for the Tuamotus Pahi, which is the only known Polynesian shunter.