Tumultuous Uproar

A cruising boat with a racing problem...

Velocette part 3, final design

13 November 2021
Russ Whitford
Jean Francois Masset developed his own software program for quick hull shape analysis, Gene-hull. You can find more about this open source, spreadsheet program online. When I discussed my parameters for Velocette, JF went right to work sending me analysis of the design.

The criteria of the design was that the boat should be 12 feet long, about 4 feet beam and designed for two people. The boat had to have a bulkhead forward of mid-length that could unbolt and store the bow half inside the stern half. This nesting dinghy concept is nothing new but I believe this is the first time it has been done for a performance dinghy vs a yacht tender.

A yacht tender is a dinghy that is used for transportation to shore. It must row well, take a small outboard motor and have a simple sailing rig. We had no intentions of getting rid of our 11 foot Highfield dinghy with 20 HP Mercury motor. Velocette was designed to be a sailing rocketship that would be easy to store on the cabin top. That criteria allowed it to be a minimalist design, not intended for rough water or heavy loads. The only cargo Velocette would carry would be a bottle of wine!

We discussed a hard chine design. A hard chine is a distinct corner or chine instead of a smooth-round hull shape. Hard chine allows more beam aft which helps the boat to plane. JF submitted several hard chine shapes but I didn't like the look of the hard chine going all the way to the bow. I wanted the hard chine to end at the mid-length with the bow shapes being smooth curves.

JF had to modify his Gene-hull program to make this work. He did!

Velocette design is not copyrighted in any way. Anyone should feel free to duplicate it. I can provide a lot of help if someone else wants to build one. I have the design sheets I will share with anyone interested. They are quite interesting to see but I can't post them to this blog. I'll try to attach to my FB page.
Vessel Name: Tumultuous Uproar
Vessel Make/Model: Beneteau 42s7
Hailing Port: Milwaukee, WI
Crew: Russ Whitford & Lisa Alberte plus Sophie our Jack Russell Terrier
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