Timber varieties and moisture content

If there is interest?! I asure you that there is lots of interest. It is the construction that is so often missed in the story of a new boat. Pictures PLEASE.

Gary

 

Tad,
The rendering is a little outdated with the sail plan. Two furlers will be fitted onto the boat not three. The outer being a 100%. Inner being a much smaller. Seperation of the sails is obviously important here. Trysail will be fitted with a wishbone boom sheeting to the mizzen.

Keelson/Sheer clamps are laminated timber. There is no foam in the boat but quite a bit of plywwod and balsa. To me, flanging the inner is not a problem, considering that it is simply another secondary bond and the longitudinal component is supported by the timber core. (external laminates also rely on secondary bonds with overlaps too).

AS 4132 is an Australian Standard used for commercial vessels. Not sure how it compares to the ISO standards. It has been a couple of years since I have had anything to do with ISO.

Probably post something in the sailboat forum later.

Brett

 

See the other thread in the boat building section.

 

Tim and Tad:
Designing a bottom to be developable restricts the shape and is usually slower. I have built many Carolina Sportfishermen. The bottom panels are not narrow short pieces. For the aft end of the hull we use full width plywood panels. Forward they are cut into triangular shapes. I don't know who uses kevlar in between layers, but it makes no sense. It is a core material. There are builders who use juniper and epoxy/fiberglass laminated skins.

 

nickharris

I am thinking of buying a wooden boat. I have found one that fits most of my criteria. But I am concerned about its construction. It was built in Miami in 1969 by a William Rudolph. I cannot find anything about him. The boat is 84' overall. It is described as 'triple diagonal planked Cedar on fir. Built using modern techniques with epoxy glues, relatively widely spaced laminated frames and many longitudinal stringers'. 'triple diagonal 1-1/4" cedar planking; framing: 2-3/4" web frames up to 12" depth at sheer clamp and turn of bilge. Approx 4" on counter; longitudinals: 3-1/2" x 1-1/2" approx 12" OC; keelson, stem and horn: 2" x 12" laminated planking forming 12" x 12" timber; fasteners: bronze nails and stainless steel bolts; deck beams 4-1/2" x 4-1/2" laminated fir.' ' 8 welded steel bilge keel webs which attach to keel bolts and bulkheads. Three primary bulkheads, one of which is watertight. Steel box keel encapsulating cement ballast. Main mast is spruce and mizzen alloy'.

I have no idea whether this is a good, bad or indifferent construction. I would be most grateful if someone could comment generally on this construction and what I should be most worried about. I believe there is some corrosion of the steel webs. After all this time, is the epoxy likely to have deteriorated? - and if so how can one tell and what can be done about it. I will, of course, have a full survey done but only if I am reasonably confident that I have something worthwhile in prospect. The boat has operated in the Caribbean for most of its life.

 

I think you should hire a surveyor knowledgeable with wood/epoxy construction. The method is fine if done properly.

 

i'm new to this site
but not new to wooden boatbuilding
and over the years have travelled extensively
searching out boatbuilders
i would consider myself a traditionalist
as i prefer carvel planking etc..
yet in my travels i have been fortunate
to learn from others who use more modern techniques
such as wood/epoxy, cedar strip, vacuum bagging, et al..

the most knowledgeable person i know of lives on the east coast of canada
his name is John Steele and operates an amazing boatyard in Nova Scotia
his company is called Covey Island Boatworks
some of the craft he's created will make many drool
check out their website
and/or give them a call

http://www.coveyisland.com/

~poetprince