'69 Chrysler rebuild..... no stringers???

[EthanFire]

'69 Chrysler rebuild

'69 Chrysler rebuild

OK, now that the tax return is coming back, it's time to order supplies, move her into the garage and start the rebuild. I've slackin', but also doing a LOT of research and learning from you guys who have gone into the dark before me! I've been watching videos, reading books, and I'm pretty confident I'm ready to tackle it. I've gotta get started NOW so we have it to play with when the weather gets nice.

So..... a couple more questions before I order "stuff." Anyway to figure out what weight CSM they used to glass the deck? I think I'm going to tab in the deck with 1708 or something similar for ease of use (like Friscoboater did), but the deck and tabbing was done in CSM originally. I've pulled it off the old wood deck just to confirm (after I took this picture). You can see an air gap between the tab and deck glass on the lower right of the pic. Tearing it apart, it looks like just the two layers including the single layer over the deck. I'm trying to stay as close to original as possible. Do you think the heavier glass would create stress points? Is chopped mat difficult to get into the corners for tabbing? Thoughts & advice from those who have been here before?

 

[Woodonglass]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

Check the link in my signature for Drawings on how to do your Deck, Stringers and Transom.
My Guess - ti - mate for quantity of materials will be.

15 yds of 1.5 oz CSM
10 yds of 1708 Biaxial cloth
15 gallons of 435 Poly resin
A Fiberglass roller
5qts of Cabosil
1 lb of 1/4" chopped milled fibers

 

[EthanFire]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

That's more layers than I was planing to do on the stringer, which isn't really a stringer on this boat..... but probably a good idea. Original is a keel support that runs from the stern about 3/4 of the way to the bow, and is only around 4 inches tall. Then the compartment is filled with foam, supporting the hull/deck. Do you think going that thick in relation to what was there before will cause any stress cracks? Or does tapering out layers take care of that?

 

[Woodonglass]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

Did the deck rest on the "Keel Support" or just on the foam. If there are no other stringers and the deck sat just on the foam then your hull is the type that requires pour in foam as a structural component for the hull. You should prolly send a PM to OOPS to get his input on this.

 

[EthanFire]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

Yep.... it's structural. The deck sits right on the foam. I've been reading a LOT oops! threads and comments. Particularly http://forums.iboats.com/showthread.php?t=522237 on decks and foam

 

[rrumba]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

well you are surely in the thick of it. nice little project and your making good progress. one little so called stringer is not all that bad to put in and the extra support i would not expect would hurt it, especially considering the fact that you have a crack in the stinger as it was. Foam, new sole, and WOGs flooring will give you the support.

engineer, please take my ticket for this ride as i am on this trip.........

 

[oops!]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

hi ethan.......gotta run to the store......ill jump in when i get back

 

[oops!]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

ok....im missing something.....

is the stringer (or keel support) wood or foam?..

i would use wood for that one...

one layer of 1.5 csm over it.....then a 1708....then another 1.5 csm then another 1708....let cure....use wax in the last resin layer....you can do all 4 layers at once....and just add wax to the resin at the last layer.

after you cut your deck as close as you can to the interior shape of the hull....fill the gap with peanut butter.....and tab with one layer of 1.5 csm over the wet peanut butter.....then over the wet csm.....do a 1708 tab.....4-6 inches on the deck....4-6 inches up the side...for a total of 8-12 inches.

that link you are following on how to install a deck and foam a hull.....is exactily how i do it in my shop.
make sure you pay particular attention on how to glass the first layer of csm to the new plywood...a good bond is is very important...and you can add all the glass you want after the first layer....but if the first layer is not attached to the plywood....you will rot.

you asked about csm going into corners easily.
csm is a bunch of individual strands of fiberglass treated with a binder and pressed together.

when you add the resin.....the styrene breaks down this binder and the csm will become like mush....it can be manipulated, bent, and benched together to go into just about any shape you want
one thing.....csm does not like 90 deg corners....it will conform somewhat to an inside corner....but not an out side corner. (going over the top of a stringer)
to do an out side corner.....you need to rip the csm.....break the binder by hand.....then you can more easily do an out side edge.

the same cannot be said about 1708......this is a woven product that is very thick, it does not like 90 degree corners at all.
inside corners are not too bad.....but forget out side corners...you will get air.

this is where the fillets you have heard about come in to play.

on the inside of a 90 degree corner....take some peanut butter and lay some into the corner......then take a big spoon and spread it into the corner.....this will give you a nice round corner to work with when you glass.
as far as out side corners with the thicker 1708...just do the best you can...people have tryed to round the corner...and do every thing to get the big knit to lay down with out air....rarely happens. you could add a round dowel to the top of the stringer....and glass over that.....but that is a lot of extra work and the big knit would have to be placed exactly over the radius or it will lift on you.

again....just do the best you can.

i hope that helps
cheers
oops

 

[EthanFire]

Re: '69 Chrysler rebuild

Re: '69 Chrysler rebuild

Awesome, thanks for the help! That pretty much sums up the questions I had and firms up what I was planning to do. The keel support is wood, glasses into the hull then foam up to the deck.

I'm sure you've heard this before, but your posts also solved my biggest dilemma....... the deck. Figuring out how to foam under the deck and make sure it fills the whole void and supports the deck entirely. The answer was the mock deck with shrink wrap. Genius.... I LOVE IT!!!!

Thanks again for all the help guys.... I'll post pics as I progress. And I'm sure I'll run into more questions.