strip built dinghy

[reinbilt]

Anybody know of plans for a 10 to 11 foot dinghy that can be strip built that resembles a shellback dinghy? Thanks for any help!

[Venchka]

No idea if this remembles a Shellback, and you'll have to take a foot out of her...

http://www.gartsideboats.com/pgimages/12-ply-sailing-dinghy-136.jpg

Gartside dinghy (http://www.gartsideboats.com/catsail.php#12ply136)

[B.Marks]

Why would you want to go to the trouble of building a strip boat, when you could just build a shell back as drawn? The beauty of the design is in it's simplicity, ie nice lines and simple to build.

[Venchka]

He has a pile of strips looking for a good home?

[Steve Paskey]

Have a look at the Inishmore 10 from Selway-Fisher:

Inishmore 10 (http://www.selway-fisher.com/Otherupto10.htm#INI)

http://www.selway-fisher.com/Inishp2.jpg

http://www.selway-fisher.com/Inishd1.gif

A fine-looking boat, and the specs are similar to the Shellback, except that the Inishmore is beamier:

LOD 10'0" (3.05m)
Beam 4'11" (1.5m)
Draft 8"/2'9" (.22/.85m)
Approx. wht 100 lbs. (45 kg)
Sail Area 53 sq.ft. (4.89 sq.m)

[ 04-13-2004, 09:26 PM: Message edited by: Steve Paskey ]

[rbgarr]

This isn't strip built exactly. It's a design by one of the Cutts (of Cutts and Case Boatyard) executed in their "double planked with kevlar-cord 'framing' method".

Lightweight, smooth-seamed and strong.

C&P'd from WB issue #78:

http://www.imagestation.com/picture/sraid112/p3f886a9fa3792166bacc5f847ee4f840/f904f81d.jpg

[ 04-13-2004, 11:50 PM: Message edited by: rbgarr ]

[Venchka]

Well, you learn something new everyday.

About half of Iain Oughtred's catalog can be strip built. I got tired of counting them. Several in the 10'-11' foot size. And several more a wee bit shorter or a wee bit longer.

[Venchka]

Originally posted by rbgarr:
This isn't strip but exactly. It's a design by one of the Cutts (of Cutts and Case Boatyard) executed in their "double planked with kevlar-cord 'framing' method".

Lightweight, smooth-seamed and strong.

That is quite interesting. Where could I find more information? That method appears to be adaptable to other designs, no?

[JimD]

The Wittholz 11 foot cat dinghy is a little strip or cold mold beauty, comes with marconi or gaff rig. Plans available from Wooden Boat.

[JimConlin]

I remain baffled by the Cutts&Case method. Why put the strong material at the neutral axis of the panel where it adds nothing to the panel's stiffness?

I never saw a structural beam with the material concentrated in the middle.

[rbgarr]

Jim-

You'd have to ask the Cutts folks (Cutts & Case, Inc., PO Box 9, Oxford, MD 21654). I don't even pretend to understand the terms used in your question, much less know how to respond to it. :(

I've just always liked double planking and hated framing and caulking and all the complication that goes with that. Lining off, spiling, and fitting are the artistic, mental and handwork attractions of boat building for me, and building a boat so that you get to see that tight-seam work on the inside as well as the outside (if left bright) really appeals to me.

[JimConlin]

Sorry if terminology was obscure. I'll try to explain in other terms.
The C&C method involves double carvel planking where , in the surface between the two layers of planking, a groove is cut in one layer of the planking a kevlar cord is inlaid in the groove. The cord serves the function of holding each plank to its neighbor without the help of transverse framing. The cord is hidden within the assemblage and is therefore invisible, so the appearance is of smooth carvel planking, inside and out.
My issue is with the transverse stiffness of the assemblage. There's no framing to supply it. The cord, being buried in the center of the assemblage, can't offer much unless tha planking is thick.
Does this help?

[rbgarr]

As I undertand it (and I've only seen the dinghy shown above, not used the method myself) the kevlar cord is saturated and set in thickened epoxy which fills the routed void, thus intended to serve as an internal framework across the whole shell of the hull from sheer to sheer, bow to stern. It's not there to hold the planking together since epoxy between the layers and along the edges of the courses of planking does that. In a small boat, it all seemed perfectly adequate for stiffness, but how it would pan out in a larger craft I couldn't answer. In that sense the kevlar serves a similar function as fiberglaas cloth does to a fiberglass hull.

That's my understanding only and I don't claim thorough knowledge or even superiority for the method over strip building or other kinds of cold molding, which sometime do without the framing you mention.

I recall that C+C, Inc. was building a larger powerboat (50'-60' commuter type) using the method when I was there a number of years ago. Perhaps they have finished it and would know whether their method worked out okay in regard to your concern.

[ 04-14-2004, 07:48 AM: Message edited by: rbgarr ]

[cdragon]

The Cutts&Case method is very interesting, and if you are serious about it-it can be just as interesting talking to Eddie Cutts about it-he doesn't suffer fools lightly, but he is a very knowledgeable and intelligent boatbuilder (and opinionated). Maybe one of the forumites here will pony up for a nice big Cutts&Case yacht-like a 60 foot ketch or so and the world can really see whether it is the business or not!!!

[marwesmed]

Reinbilt,
You could look at plans by compumarine, they may have something that you would like.

[MJC]

Question:

Does the Cutts and Case patented method also use inner and outer layers of fiberglass?

[reinbilt]

Steve,
The Inishmore 10 is exactly what I'm looking for. My version would be rowing not sailing. Thanks to all for the quick replies.

[rbgarr]

"Question:

Does the Cutts and Case patented method also use inner and outer layers of fiberglass?"

No.