Here is a short video from a waterproof point and shoot taken in the morning before taking the boat into the work shop.http://vimeo.com/50453375
i already got a replacement on warranty for the original boom cam so some day there will be a new vid.
Northsea, Thanks for the input. i could find out the static center of resistance. i am under the impression that the dynamic center is going to move around depending on where the driver is sitting, how far healed over the boat is, what point of sail the boat is on, speed/angle of attack of the water passing over the rudder foils, etc.
What you my be getting at is the mast looks like it is too far aft. That may be the case, but i want to be able to drop into a wave on an outer reef and not pearldive at the bottom of the wave. Also things get pretty hectic jibing in the full trades, so everything that helps keep the bows up is welcomed. Although the cat could possibly blow over backwards, there is a way to control that. Don't go to the back whilst stopped. Also i will try sailing with the mast raked further forward.
The boat is too hard to tack and jibe with the current rudder and sheeting systems for anyone else to try the boat right now. The alignment, rudder rake, and hold down system need fine tuning, and the mainsheet block is from an 18. The boat is back in the work shop for these modifications now.
Originally i planned on making a scaled down 18' cat mast and sail. When that got changed to using existing windsurf parts the rigging concept didn't change. There is a cat style boom, mast rotator, diamonds, and adjustable downhaul. The hounds are higher up proportionally, than an 18 though, and since the diamonds need re-designing, pulling on a wire connected to the hounds bends the mast rather easily making trapping out impossible for now. Even a big gust overly bends the mast which de-powers the sail. So does high downhaul pressure. The sail seems to develop good power being held upright from near the top when the mast does hold it's shape. Normal windsurf booms hold the mast from very low and the top of the sail falls off, spilling power. i think that is one reason that windsurfers can use such big sails in strong wind. i may re-rig and try your idea though.
DHO, The Gcat is certainly the shape that inspired this hull shape. From my experience keeping the transoms out of the water is a light wind thing. Once you are bookin it you can stand further back, get the bows up and load up the rudders.
The V sits down in the water more than the boxy hull creating more wetted surface, but the V is a slippery shape. Also in a comparison you would need to add the wetted surface of the boards used on the conventional hull shape plus consider the added drag caused by the hole in the hull for the boards.
It is my subjective opinion that a board-less hulled cat would be able to go faster than the boarded cat on the right reach. windsurf boards are that way for sure. This theory excludes hydrofoils of course. Obviously dagger boards offer a more efficient lift for beating to windward, and getting first to the upwind mark really helps in winning a race. Then you can throw up a kite and over power any extra drag. Once you get to a certain wind velocity the kite becomes drag though. Hopefully this boat will be good for wind above that velocity.
i have only checked the weight of the hulls during construction and they were about 25lbs each before the final finishing process. 100lbs. is a good guess for the all up weight.