lachlan3556 said...Just for arguments sake and you assume some people know nothing of Class 3 construction techniques
what parts of this machine could be slimmed off to reduce weight? Will also accept info on other class 3 construction projects/techniques
I agree that it looks great too!
I was simply looking at the wing construction.
If you are happy to accept that a wing with no sail has almost no compressive load, because there is no need to crank the Cr*p out of the mainsheet to standd the leach up, the whole structure can be lightened very considerably.
My wings with a sail, were made from "blue foam" as used by house builders for cladding, hot wired to shape, and then a main spar of 4mm plywood crosswise at maximum chord, with either an 8mm alloy bar each side, or toves of carbon. It was all clad with 2 layers of 6oz S glass. A 5metre long wing usually weighed around 10 to 12kg complete.
I would reckon on a wing with no sail Class 3 size of 7.35 square metres being able to be no more than this. I forget what the wing on Cogito, the C class catamaran weighed, but from vague memory it was around 35kg and had an area of 300 square feet. (Sorry about the mixed measurements but the class rule was such). That was with all control systems for a 3 panel, 3 section, twistable wing!
I am happy to write more about how to build a wing like this, but suspect the forum is not the right place. There was a previous post, but I am not prepared to look it all up cos I am lazy!
