Original Tomcat 30

I just got some pictures of a version 2 I think it was, Tomcat 30 trimaran from the owner, Robert Wakeman. This was the design that first got me into Multihulls Magazine. The idea was to be the fastest 30′ multi possible that would meet offshore racing rules. Back then none of the multis I saw thought about headstay tension and pointing. This design did. Not much I would change now some 30 years later.  It had big board, big amas way out there.  Rotating fractional rig.  Now I would round the sheers more. Add a squaretop main. A little more fullness in the hull sections.  Lighter hatches. 

A pretty cool boat.  See http://stallionoftheseas.blogspot.com/

Server was Down Again

Sorry. It turns out the email server was down again from 2 pm yesterday to about 8 am today. They claim it will never happen again. If you were sending email and it bounced, hit it again please. I have been staying with Drizzle because the tech guy, Jesus, is so good.
Other note, I got the catalog proof and found 2 mistakes. Taking updated PDF back to printers right now. The new books will be ready next week. It is an awesome book.


As far as I know Kelsall and I are the only multihull designers who are actively pushing the envelope on rapid hull construction. I have commended him for working the problem so actively. And I have criticized him in the past for ignoring global loads (he did then revise his half length panel method) and for advocating polyester resin. He does seem to mistrust materials testing and composite engineering, which is fine.
His claims of 5 hours to build a full length bagging table and KSS being “perfect, with no downsides” made me very skeptical. Especially after KSS keeps changing. Evolution is good. I do expect him to discover CM in composites soon and declare he invented it.
I have heard about KSS panels splitting open during fold-up but I was interested and surprised when I got this firsthand note from Don while I was overseas. With permission…

“I hosted his first workshop on the East Coast of the US, about 10 years ago. I can tell you it took me longer than 5 hours to build the 32′ mold table, with a continuous sheet formica 32′, without any joints. Derek arrived with 2 sheets of paper one was a sketch of the 30′ cat and the second sheet was metric offsets. I spent a week with the man 12 to 16 hours a day and I can say he held all information close to-the-vest. I spent $7,000.00 on materials. We had 12 persons at the workshop, he charged $350 or $400 per person. I provided 3 meals a day for everyone. Derek walked away with $2,800.00. I did charge him the cost of the bulk food. We ended up with 4 panels, one for each side of the 2 hulls. After all that he never provided any additional plans and I dropped the project. The table did provide very flat panels. We had trouble with the gel coat. There were sections that looked like wood with worm channels. I had a large barn that was built in 1860, the boards on the side walls, had gaps that were a 1/4″ to 1/2″ between boards. It was summer time in Pennsylvania but it would cool off by 10:00 PM. The gel coat was applied at nite. That, cool air coming through the cracks, may have caused the gel coat problem, the mold table was 3′ to 4′ from the wall. None of the 12 persons purchased plans from Derek.”

J. R. Watson

I did stumble onto an old IBEX paper by JR on In-Field Repairs. Good one. I will find out if he has has a link or a word file of it.
One gem. Wet epoxy spills will fluoresce just like body fluids. Who knew. Grab that blacklight from behind the In-A-Gadda-Da-Vida album…


Finally back. I did get the new Design Catalog to the printers today. On the trip I also got the CM Construction print Manual updated again and the upcoming Composite Construction Manual only needs to have the page numbers sorted out.

Conservation Remix

Back on the 10th.
A lot of what multihulls are about is doing much more with much less. Along that line find a very interesting event coming this June 2nd at University of Washington. http://conservationremix.org/
Actually I’m surprised they didn’t include multihulls, (and maybe even local designers who are alums?)

To register, visit: http://engage.washington.edu/site/R?i=UZKdoK5mX3D1Stjswp9tiA
Look at some of the topics:

Pamela Ronald
Genetically Modified Conservation
Pamela Ronald wants to use modern genetic techniques to create a new brand of
agriculture that slashes insecticide use, increases yield, and thrives in a warmer,
wetter world.

Yoram Bauman
A More Verdant Tax Code
Yoram Bauman, a University of Washington economist and standup comedian, thinks
we’ve got the tax system backwards. We tax things we want more of (i.e. paychecks),
not things we want less of (i.e. pollution). Doing the opposite would yield cleaner
air and
flusher bank accounts.

John Edel
Indoor Urban Agriculture
John Edel, a Chicago entrepreneur, has transformed an abandoned meatpacking facility
into the nation’s first vertical farm. His goal is to bring large-scale,
net-zero-waste food production right into the middle of the city.

Joe Roman
Invasive Species Cuisine
Joe Roman, a biologist at University of Vermont, believes we can best tackle
outbreaks of non-native species by serving them up-for dinner.

David Allen
What is a Smart Building?
David Allen, executive vice president of the engineering, construction and energy
services firm, McKinstry, designs super-efficient buildings that “know” when to
consume, shift, store-and even generate their own energy.

Brent Constantz
Cement that Absorbs Carbon Dioxide
Brent Constantz, an entrepreneurial marine geologist from Stanford, believes that by
mimicking the way marine organisms create shells, he can manufacture concrete in a
way that traps carbon rather than spews it.

Susan Mac Cormac
A New Twist on Capitalism
Susan Mac Cormac, a corporate lawyer with Morrison & Foerster, helped launch a novel
corporate form a kind of hybrid between a nonprofit and a corporation that has the
flexibility to pursue both profits and stewardship.

Sherri Ritter
Nature Inspired Engineering
Sherry Ritter, research and education specialist with the Biomimicry 3.8 Institute,
teams biologists with engineers, architects, designers, chemists, and others to
design super-efficient, ecofriendly technology based on nature’s time-tested