There are two "wide-body" Classic Moth designs currently kicking around, the round-bilged Titan, an American design, which is featured in this header photo, and the French Proust design which I profiled in this post. The Proust design is a simple, v-bottom shape and should be easy to plank in plywood though Jim Young built his version in fiberglass/foam-core. If you build it with the open cockpit as Jim Young did (rather than the racing cockpit), the Proust should be more than capable in taking an adult and a young kid for a pleasant day-sail.
Jim Young named his Proust version Tippy, a misnomer since this design has more than enough stability for a Mothboat. I've taken the Proust and made some changes and in keeping with the Jim Young naming convention, I've deemed my version Zippy.
The Jim Young Tippy at the 2008 Elizabeth City Nationals.
The original Proust had a chine log which I've eliminated to make it a true V-bottom. I changed the rocker and the sheer slightly. I have it on my list to make a model of Zippy but as my friends know, my projects take a very long, long time. If anyone out in the bloggosphere would like to make of model of Zippy, please send along photos and I'll post them.
Here are the the 8 station offsets for Zippy in metric. To print or download, click on the pop-out icon on the top-right corner. It will open the PDF in another tab where you can print or download.
Here are the offsets for Zippy for stations set at 336mm (13 inch English) which is really too many for a traditional build where you leave the frames in the boat (like the Nantais or Little Mae Moths).
And here is "Zippy the Pinhead", the cartoon star, the enigmatic master of dry wit from another dimension, a cartoon I always checked in with daily even when I didn't understand where he was going.
Where to put the mast and daggerboard in a Classic Moth?
Luckily, John Shelley's construction drawings for the Shelley Mk 1, which he used in a patent application, have now surfaced on the internet. His mast and daggerboard placement as indicated in the drawings below are good placements, though, if you went around the fleet with a measuring tape, you would find this might vary by up to 75 mm from boat to boat.
Center of mast back from stem - 695 mm.
Leading edge of daggerboard back from stem - 1453 mm.
Bald but my eyebrows are growing at a prolific rate. Sailed Windmills and Y-Flyers in the 1960's. Founded Miami University (OH) sailing team. Sailed International 14's and Lasers in the 1970's. Sailed International Canoes in the 1980's to mid 1990's. Sailed Classic Moths since 2002. Enjoy boatbuilding though I'm very, very slow at it (the Internet doesn't help matters). Name in real life: Rod Mincher
After choosing this username (Tweezer is the name of my Classic Moth), further research on the Internet turned up that Tweezerman is a corporate name for a line of pedicure products. Let me emphasize that I do not work for, nor endorse these products.