WOODEN BOAT SCANTLINGS
WOODEN BOAT SCANTLINGS
(OP)
Dear Sirs:
I'm carrying out a complete project for an already built wooden ship,(two masts and L=12m). I would need some information about what kind of rules would be usefull in ordeer to scantling the main structural members. I would also need information about how to include the sail effect on the stability calculations as well as info concerning natural air ventilation systems on accomodation spaces on sail ships (double cone exhaust, etc...).
Thanks in advance for your answers.
I'm carrying out a complete project for an already built wooden ship,(two masts and L=12m). I would need some information about what kind of rules would be usefull in ordeer to scantling the main structural members. I would also need information about how to include the sail effect on the stability calculations as well as info concerning natural air ventilation systems on accomodation spaces on sail ships (double cone exhaust, etc...).
Thanks in advance for your answers.





RE: WOODEN BOAT SCANTLINGS
I'm not sure I understand your question as it's posed... Is the vessel already finished? Are you working on a restoration? What's going on here, really? :)
As far as rules of thumb for addressing scantling sizes: Look to the past. The old designer/builders such as Herreshoff, Fife, and Atkins knew more about applied physics than they would've cared to admit. They determined scantling size and position largely intuitively, but with so much experience; modern testing has shown their construction specifications to be well within "acceptable" parameters.
It's not just strength of structure that determines scantling size (though that certainly plays a part!). If the boat is plank-on-frame, will there be enough wood in the frames to allow for refastening? Is the turn of the bilge too quick to allow steam-bent white oak its full strength? How about if the vessel runs into an awash CONEX at 9knots some breezy night at 0300 hours?
Sorry I can't be of more help, but I would say find the oldest and crustiest boat carpenter in your local shipyard and buy him all the ale he can handle whilst pumping him for info!
Kind Regards,
_____________
eponodyne
RE: WOODEN BOAT SCANTLINGS
Kind regards.
Adrián
RE: WOODEN BOAT SCANTLINGS
After some thinking about your situation, I realized that every possible answer to your questions about the sizes of your framing members cam be found in one volume:
It is titled WOOD As An Engineering Material; I forget the author, but it's published by the Forest Service Laboratories at the University of Wisconsin. Price is something in the area of $40 U.S. Contains tables that show relative strengths (Modulus of elasticity, properties under torsion loads, suitably in depth for your needs; as well as entire chapters devoted to understanding why glue even works at all on wood, and why some species are rot-resistant and others aren't...)
I hope this helps.
RE: WOODEN BOAT SCANTLINGS
Wood as an Engineering Material won't help You much as it - as far as I remember - says nothing about determining the scantlings of boats. But it is a great source when it comes to mechanical properties.
I would instead recommend one of the old classic books about yacht design, Skene's Elements of Yacht Design. In it, You'll find information about determining the scantlings as well as information on stability and ventilation.
You could/should also get in contact with one of the classification societies (Lloyd's, Bureau Veritas, Germanischer Lloyd's etc.) Many of them have rules and guidelines for the design and construction of wooden boats.
I have used the rules of Germanischer Lloyd's a couple of times, and they are quite straightforward.
Using the rules of a classification society has another advantage: The authorities know these rules.
Hope this was helpful!
Søren
RE: WOODEN BOAT SCANTLINGS
Kudos!
RE: WOODEN BOAT SCANTLINGS
http://www.woodenboat.com/
RE: WOODEN BOAT SCANTLINGS
First of all: Thanks to eponodyne!
Secondly: You could also check this website out:
http://www.boatdesign.net
There are some great forums there, too!
Søren
RE: WOODEN BOAT SCANTLINGS
They will gladly take your phone call and are enthusiatic about wooden boats.
RE: WOODEN BOAT SCANTLINGS