Alan Welbank asked about Southern Yellow Pine.
"Southern Yellow Pine" is a catch all phrase for half a
dozen or so species of pines which grow in the S.E. USA.
Fortuitously, (saves me the bother of listing them seperately)
the woods of southern pines have a lot in common:
They are classed as moderately heavy, moderately hard,
moderately strong, stiff and shock resistant. The heartwood
is moderately resistant to decay. They all shrink a lot when
drying but when seasoned are dimensionly sound. Fastener
withdrawal resistance is excellent and ranks above hemlock,
spruce and Douglas fir. They average 38 lbs per cubic ft
(593 kg per cubic metre). My personal experience is that the
wood age hardens well but unless treated is subject to insect
attack and if exposed to the elements decays quickly. I have
not heard of the wood being used for boat building. But of
course that doesn't mean that it isn't. Why don't you 'phone
the Forestry Commission? They should have many answers
on file or at least be able to point you in the right direction.