QUOTE(Tight_line Tug_a_War @ Jun 22 2009, 09:39 PM)
<{POST_SNAPBACK}>Good points...true on who knows what they were thinking when they build these, I've seen them with stringers that don't attach to the transom, butt joints to make length without splines or any fastening, Glassing only half way up the stringers etc etc... I'm half a step from the poor side of town, and I'm thinking if I epoxy & glass each stringer first then bed and glass over, tab in etc that should more than make up for shear strength, but I'm lost on the 'bending' you mentioned{ referencing 'active stringer system' maybe?}..can you supply a guy some enlightenment...Thanks this is a first for me doing it alone and one can never have to many friends offering idea's.
Wives...they just won't let us play the game as we see fit...go figure..lol
yep what gunner siad the standard plywood isnt as strong. if you make a beam out of it (glue together and cut to shape like the original lumber) it wont be as strong as the marine ply. the marine ply has extra layer for the same thicknesses, thats where most of the strength probably comes from, thats and the wood species they are made out of. usaully douglas fir or western larch.
check out www.speedwake.com i have a thread on there.
and lotsa good info on www.boatdesign.net in the fourms but beware most people are like me, novices jsut trying to repair the POS that they bought and rotted out from under them. There are a couple actual nautical engineer types boatdesingnet tho.
I also may be making my boat too stiff this way, some people say go with the douglas fir lumber planks for strength and flexiblity. but i'm also throwing a little carbon fiber on top of my stringers.
some boats dont have there stingers glued down hard so that the hull bottom doesnt get stress cracks. my main stringer where bondo'ed down hard but all my lateral short peices were not. i'm gluing everything down tight and adding extra bulkheads.
I figure anything i do will be an improvment over how baja slapped it together tho.
biggest thing is gonna be keeping the wet stuff on the outside this time. canvas cockpit covers suck always, they will eventually leak.