27 Cat Update

This is an update to my venerable 27’ sailing catamaran design. I am doing it first in foam/glass, largely built on a bagging table, then later will do it in CM developed plywood.
The interior space has increased, but the overall configuration is the same. The berth width inside will be just over 3’ wide. Like on the original, the galley and seating will be just inside.
It will still fit on a trailer. More on features when I get a chance.




27 Cat Update

I’m modeling an update to my early 27′ catamaran design. That was 1983 as I recall.
It will be first designed in bagging table foam/glass, then next in the rapid CM plywood epoxy. I’m trying to keep the original functionality but with sick new looks.

Redoing another version.  Figured out how to keep the inside space as big but looking smaller.  That’s what designing is.

32′ Trimaran Runabout

I went rogue on a 32′ power tri runabout design. hope customer likes it. communication difficult on the road here.  Foam/glass.  30 hp gives low 20 knots empty and 45 hp full load.

Tried to make a radical look functional.  Opening doors on each side of cockpit.  Steps are aft to motor.




Mini Ocean Liner

Exploded view of a 79′ mini ocean liner I am working on.  Just a study so far.
I sent pics to Roman but no response so email address might not be working.

Later note.  I have already figured out two ways to do the connective job much lighter and easier.  Design process.




Transit Shuttle Catamaran

I am getting work done when out of the office.
This 25’ shuttle catamaran is designed to take people off of a beach, across a reef, and out to the deep water charter catamaran.
It is 25’-4” x 9’ x 8”. It can be trailered and will cross a very shallow reef easily where it will work in Kauai.
It has an almost flat bottom to maximize displacement, and flared sides to increase pounds per inch of immersion for every added inch.
Someone called me a couple of months ago from Oahu who wanted their deep water cat design to get across a 1’ deep reef. Could not be done. This could be the solution.


Plate Expansion Program

Does anyone have a suggestion on a plates expansion program that they trust? I have used Vacanti’s B-Plates for many years, but it seems Dave has given up on supporting it. It was always cranky but worked. Until now.  Both Microstation and Rhino proport to do that but I don’t trust them yet.

Oceanography Drone

Over the last month I got to design an oceanography research drone. It is only 157″  long and carries a research cargo that I am not allowed to show. Oddly it is aluminum. The builders of the whole package were open to composite but the end users insisted on doing alloy.

This was the project that crashed both Microstation and Vacanti’s B-Plates program. Both companies seem to have given up on a solution. Among other problems, Microstation seemed unable to export any usable non-native surface nor solid format. I ended up only able to export the chine splines and customer had to make surfaces there. You would think that level of fail would be shareware, not a $5000 program.  Attempting all manner of work-arounds took longer than the actual billable work.

The notch aft is for an azmuth drive.










In any sailing magazine now we see that reverse bows are all the rage. For any multi to look new, it must have them now. I’m seeing an odd trend where designers are now adding reverse bows to any frumpy old design and presenting it as a whole new design. Its like any overweight production cat can now claim that it shares DNA with the America’s Cup cats. I do understand that the reverse bows do help a bit in smoothing the ride, but guys, if you put a hood scoop on a 1993 station wagon, it is still a station wagon. Like on the pic, it could even be a fragile station wagon, but it has the swag now.  Its like a yuppie magnet.
I have been doing reverse bows on many designs for at least 5 years, and I respect the power of the style tide. But look at all the station wagons posing.


No IBEX for Me this Year

I am pleased that IBEX is back in sunny Florida again, but I cannot make it to this one. Its not because they ask for, then ignore, my suggestions about needing papers there on e-commerce pitfalls and DIY boat building.  As noted in previous post, I will be out of country.

Anybody who attends and sees something cool, forward to me and I will post.

Out S12 Through O4

It turns out that I will be out of country September 12 through October 4. I will have laptop with me and a chance to catch up on design, drafting and modeling. With no phones and no email.
I will try to get everyone caught up before I go, or take it with me.

I did get a week behind last one.  A tiny job took all week as Microstation i now fails to do any trims and tech does not know why.  The workarounds to customer ended up taking all week.  Microstation seems to have no sense of urgency at all.

More Magical Aft Beams

Another new example of the aft beam that disappeared. The Mcconaghy 49.  There is a kind of fence there, but between the fact that there appears to be no shear transfer between it and the hulls, and its complex shape, I’m sure it has no structural use. The aft connective has to be tucked into the bridgedeck. Again, when you reduce beam height, the strength and stiffness goes away exponentially. Magical must mean much heavier.  With enough carbon and enough money, you can do almost anything magical.  I prefer efficient engineering to magical.  Will also be tough to drag a crashed board up with a halyard at that angle.

magical iso view c blackgold no strip