Back. A few of the plans of the 42 daycharter cat sold last week. It needed conversion to metric and some of the hand drawn parts converted to CADD. Thats done. Back at it next week on this blog and the custom projects.
Bowtubes and the USCG
You surely remember the broken lumber A-frame shown recently here on the 42 daycharter cat. The owner chose to replace and update with a standard alloy tube and wire system.
My worst fears about MSC came true.
I submitted the stock, stamped, original plan sheet to MSC. I also submitted an 2017 version with the same section properties or better. Keys Rigging submitted the proposed with extra strength on all items.
It was rejected. They wanted the calculations also. Done. Those were rejected until I would explain how I did my calculations. They did not have a standard to aim for. In fact I was asked to explain what the relevant factors were. It has been almost 2 weeks of back and forth now. My fear that nothing that was settled “law” before, is now.
I have probably done a hundred of these, and I bet Keys Rigging has done that many also, or more.
I also get the feeling that they are stressed and angry at MSC. Maybe Trump chaos has hit there also.
This is one part of why no postings last week. Deadlines also. Next week will be better I’m sure.
35′ Tri Process Picture
A screen capture of transparent mode.
Flat surfaces are placed. Next they get the cutouts.
23′ Trimaran Update
I finally got the first run of modeling the updated 23 daysail trimaran. Version B will have ama rudders and the even hotter version C will have foils. It is a developed plywood/epoxy unit with core vacuum bagged onto the flat surfaces needing that. And carbon fiber where it helps. At around 360 kg lightship weight, it can be built for around $5000 us in construction materials. The connecting beams should be carbon mast sections. The camper version comes next.
Looks Like Trikala
A couple of people have noted to me that this new MM TF-10 looks like my Trikala 19, with foils.
I must have come up in the world. MM used to only copy Tony Grainger.
Flame Resistant Epoxy
I see an ad for Masterbond flame resistant epoxy in one of my tech magazines. Says it meets UL 94V-0 specifications. I see nothing about meeting E-84 though. Product is EP21FRNS-2.
www.masterbond.com
Has anyone used this product?
27 Cat Update
The 27 cat update is pretty much a complete study plan now. I just finished the longitudinal sections drawing. First the rendering to recall what it is, then todays drawing. Demountable and trailerable.
The New 35 Tri
I finally got a chance to model this on that I have been looking forward to doing since before thanksgiving.
No windows nor cockpit are cut into the model yet until I verify the interior and weight/trim study. It will probably be built with vertical bows, but I hope not. Main hull not more than 84″ wide.
Displacement is 4217 l bs. It takes 5 HP to go hull speed of 8 knots.
DF31 New Update
The latest update to the DF31 with ply/carbon cross beams.
Foam/glass main hull and CM ply/epoxy amas.
One Canadian F40 Being Revived
It must have been a couple of decades or more ago the Canadian beach cat builder Mystere retained me to design them a Formula 40 catamaran. It was built but never completed.
I just got these pictures from the fellow who may be reviving it.
It looks like carbon beam tubes which is very nice.
