Category Archives: New Designs

New DragonFly or Stuff Done Right

I often see what I think is bad design being foisted onto the inexperienced.  And I call them out.  Sometimes I see designs that look good to me.  The new Dragonfly looks pretty good to me.  Finally amas that are big enough.  A snakey look. Flowing beams.  And of course the required aft swept bows.  I assume they also have improved on the single stainless pin swings in favor of a composite bushing?

newdragonfly

If I may,  all the same features that I put in my 31′ swing arm tri 10 years ago, less the swept bows.

swingtri31_152

More Sarabi and the Mast

I finally heard back from Karen on the Sarabi.  “The conclusion is that the top bearing was attached to the mast with a material that failed, causing the bearing to move, which caused the mast to fail just above the bearing.  Thankfully, no one was hurt. Everything above the cabin top went overboard. Cosmetic damage to the boat, but nothing serious. She’s very strong!”

It still seems kind of impossible, even with a failed bearing.  I have begged for pictures of the damage.

Picture 066

Maybe Stuff Done Wrong?

Customer send me this connecting beam idea and wondered if it would be good on his KHSD tri.
They are from a Scarab 32 trimaran. That unit  looks like a cloned F-boat, including the too-small amas. And apparently they fold, but I could not see how that worked there at the site. What I did notice is these beams look like they take the F-boat beam and strut and combine them in one piece, infilling everything in between.
If I may, that solid wall of beam would have to slam like a mother in waves.  Both of them.  Especially with the small amas.  It looks like stuff done wrong again.  Maybe someone can tell me why it isn’t so.

S32B-06beamsG

Stem Unit

I have noticed that the CM construction manual had the stem unit pictures fall away and I did not notice it when I had Pagemaker open.

I will insert soon, but meanwhile here are a couple of good pictures of a stem unit from builder John Stames.  He has sent also a raft of other great pictures that I will sort as soon as I get out from under the deadlines.

stem17

stem18