Hey,
The best thing to do if you really want to design a boat is look at what makes other boats so good. Is the Flyer really that much better than Goodall and Boyer's mach4 or is it just that all the quick guys Like Ashby and Bags sail flyers. One of the most successfull cats of the last two decades in australian quick cats would have to be the taipan 4.9. Still considered by some as the bees knees. It's greatest point was matching aesthetics with speed and balance, and for the time it came out it was miles ahead of the pack. If you look closely at a taipan you will notice that the butt end resembles very much a mosquito, which boyer was still building at the time of inception. and the front looks a mighty lot like an early A class. The reason they didn't just scale down an A class is that there isn't enough bouyancy for two people with the A hull.

You must remember to take into account things like change in bouyancy when looking at other designs for inspiration. If you down scale a Flyer hull, which seems like a good idea, keap in mind this amount of bouyancy was made to hold up one bloke and 76kg of boat. Not a whole heap in my book, seeing as I build 3500kg bluewater cruising cats. If you down scale something like a Flyer or another A you will lose bouyancy, and the hulls will dig in more unless you're a midget or a pygmy, no offence to m's and p's.

Don't jump in the deep end with this, talk to lots of people about this. People who know what they're talking about. If you can get a hold of guys who have built prototypes before talk to them about what went wrong and then don't add that to your design. prototypes take time. The first AHPC F18 capricorn took about 12 months to make it to the water.

One thing you might like to know. A guy buy the name of Russell Denholm who has won every class in the Taipan classes, 5.7, 4.9sloop, 4.9cat, the only other to do so was Glenn Ashby. Russell has built an A class catamaran that from a birds eye view looks like a foil. the widest part of the hull being just forward of the front beam. It was much quicker than any of the top A boys on their Flyers bot the thing couldn't turn. This problem will be solved with the next prototype to be finished soon. You may also have to do this yourself. Maybe 2 or 3. Remember also, you dagger boards should sit equal with the draft of your mainsail. Meaning the deepest part of the main. Papertigers have altered their center of effort over time using foil rake, to mave the COE back as masts became rakier and rakier.

You will need to keap everything in mind. Keap looking at other boats of all sizes for ideas though. You may have to name it after the huge number of boats you stole ideas from.

Beddoe(wookie)