Category Archives: Design Questions


Again, back.  I however see that no email will go out today. I’m most of the way through the 500 emails, but after seeing the morning news, I backed up everything before logging on.
That put me into ther time where the Eset anti-virus began uploading anti virus definitions. It slams the CPU up to 100% and it has stayed there since noon today. Nothing else is really possible until it decides it is finished. The email just keeps eternal hourglass going on.  They say that you can pause it but it never actually does.
All the email will have to wait until tomorrow.

More Thoughts on Brushing 2 Part Poly

There are many times when I don’t want to bother with the compressor and squirt gun to shoot 2 part polyurethane paint.
It could be too small a job; I don’t want to lug the compressor, or overspray will be a pain.
Awlgrip T0031 Reducer is amazing, but there are cautions.

First, it seems like magic.  I see my horrible brush marks, and in a moment, they are gone.  It’s smooth.   But, up to what seems like a half hour later, it could form a drip.  And, if you work outside, like I often do,  it will grab insects or chaff for that half hour.  Things to keep in mind.  Painting closet/cabinet doors.  Skythane 2 part poly.

45 Cruising Cat Update

I’m finally able to start updating the very successful 45 cruising cat plans. Some of the recent performance cruising cats that I have seen look like they intend that looking good is more important than being usable.
It will still have full headroom, excellent shorthanding ability and cruising usability.

It does have a hotter sail plan keeping with trending now. 

The plans are available at the old price until the study plan set of the update is available.

Shaw Powercat

This comes under the heading of stuff done way wrong. A fellow sent me these pictures and noted that the underside gets pounded in any waves. He wondered if I could help. When I saw the pictures, I remarked that it looked like something that John Shaw would do. He asked that I don’t hold it against him. 100,000 lbs. displacement.  71′ length, but looks like around 65′ of real boat. Draft 5 feet. Thinking some kind of wave splitter is the only possible solution.  If I could have only done an intervention before it came to this.

Squeege Gecko Ama

Chris Anderson is here squeeging the Rovelock laminate into the CM female mold. 1988 probably. I recall that this photo was also in the first or second issue of ProBoat magazine.  Laminates were done one side at a time, but the bag did the whole mold.  The rounded sheers were molded from sonotubes.

Racing 1981

I am doing more scans from the old photos. This is Smoholla the Shaman racing, probably in summer 1981. It would have had the board instead of the keel, but with the old amas still.
Its interesting that we are behind Seafire, a Brown 40, as we won every race that year. Except a second against Limelight at Hoggshead. The mug is the diabolically brilliant Bob Dean.  I’m not sure who the speedy cat on the left is.  Maybe it is Limelight.  This was a scan of an ancient Xerox.  You use what you got; goes for photos and sail wardrobes.

The Air Mold

Back in the 80’s I noticed that sometimes when bagging a CM panel on the mold, the part only touched at and near the front of the mold. Especially with stiffer plywood. We would put pipe or 2x4s on the top to press it down.

Eventually a lightbulb went off in my head.  Why have parts of the cylinder mold there that are not always being used?  I did one hull that way but about then Charles at Multihulls published my first design and I have been scrambling to keep up ever since.  It never got puttered-with nor published.

Its not that big a thing, it just saves plywood.  The hold-down gutter is the same.  A lumber runner along the bottom of each tiny station keeps the mold from tipping over.  And by ajusting the angle of the stations, more possible hull sections are possible.

With this mold system, the exact same type of plywood must be used on all of the panels in a particular hull.

First, a comparison with both types of CM.

Next, zooming into the Airmold.  Showing with both a panel on and off of it.

Tax Day Discount

It seems that I wasn’t paying attention to where the flow was going and the in-flow bumped me up to another bracket. I just noticed.
How does a 20% discount on all stock plans this week sound? And 10% this month?

The shopping cart does not allow discounts so I would have to refund you after.  Or get card number to me directly, paypal directly, or I can send wire information.

CM Female Mold 2

I have put the newly created CM Female Molding graphics into a construction manual of sorts. I will make it available at the website soon. /pdf to get to all of them.
It only has computer graphics at this time.

I just installed a great scanner in the office and I will be scanning the photos of the applicable multi builds to also be added to the manual.
I have also come across an armload of back when pictures that I will post.