building engineered stringers!

[Woodonglass]

Re: building engineered stringers!

Basically the same as this...http://forums.iboats.com/boat-restoration-building-hull-repair/honeycomb-tansom-core-586442.html
iBoats Member RipItUp is doing his boat with it. You might want to take a look...

http://forums.iboats.com/boat-restoration-building-hull-repair/honeycomb-tansom-core-586442.html

 

[tpenfield]

Re: building engineered stringers!

I realize that stringers are important, I will be rebuilding the boat exactly the way it comes apart with whatever materials I use. The boat only has one center stringer to begin with so overall thats pretty simple lol! Thanks for the info on stringer width thats a big help. I am also looking at coosa board for the deck but its soooooo expensive :faint:

Nathan

Many original stringers are 1/2" to 3/4" in width. Height of the stringer is the more important dimension, and if your staying with the original layout, then there should be no issues. If you got some 3/4" rigid foam and glassed 1/4" thickness over the foam boards, you should be in good shape for a 16 foot boat. For added strength, you could make the very top of the stringer 3/8" thick in terms of the fiberglass.

 

[jigngrub]

Re: building engineered stringers!

Basically the same as this...http://forums.iboats.com/boat-restoration-building-hull-repair/honeycomb-tansom-core-586442.html
iBoats Member RipItUp is doing his boat with it. You might want to take a look...

http://forums.iboats.com/boat-restoration-building-hull-repair/honeycomb-tansom-core-586442.html

Yeah, I've seen and replied to that thread... and I knew it was pretty much the same stuff, but RipItUp is in Australia and that's where that material is made or sold.

I can't seem to find a North American supplier.

 

[Yacht Dr.]

Re: building engineered stringers!

I think you should just use some good ply and poly or Vinylester resin for this.

The expense it would save you would be worthy of a few cleats or a handheld VHF ..

Sometimes its just not worth it to reinvent the wheel.

Did you actually get this 16' rotted out ski boat yet ? .. if so can you get us some pics.

YD.

 

[pyrotek]

Re: building engineered stringers!

Has anyone thought about the composite decking material? I would think you could glue some together to make it thicker. The height might be a limiting factor. I tend to agree that wood is probably good enough, but for the amount of time invested it is worth looking around for a better material that might be only a tiny bit more expensive.

 

[55evinrude]

Re: building engineered stringers!

Well thanks everyone I guess I have to make a decision (if i get the boat) on whether or not to go this rout or just good ole ply wood! in response to pyrotek: if I ended up going with fiberglass stringers I would use coosa composite board for the deck and transom.

Nathan

 

[Grandad]

Re: building engineered stringers!

Hi Guys, Can a tinny ask a dumb question? To a glasser, it's probably dumb, anyway.
Can the old stringers originally formed around rotten wood be removed carefully, then have the rotten wood removed from them and replaced by fibreglass (or other) materials? You would gain the use of the original fibreglass materials and when adequately strengthened and re-glassed into place you would reduce some material costs and have an identical fitting stringer to maintain the shape of the hull skin. - Grandad

 

[73Chrysler105]

Re: building engineered stringers!

That might be possible but in most cases the old fiberglass stringers have delaminated, were not properly done at the factory or are destroyed in the process of being removed. I know my stringers were basically tabbed in not encapsulated. So the only structure was the wood in that case and when the wood had rotted there was the foam and that was it.

 

[Woodonglass]

Re: building engineered stringers!

Hi Guys, Can a tinny ask a dumb question? To a glasser, it's probably dumb, anyway.
Can the old stringers originally formed around rotten wood be removed carefully, then have the rotten wood removed from them and replaced by fibreglass (or other) materials? You would gain the use of the original fibreglass materials and when adequately strengthened and re-glassed into place you would reduce some material costs and have an identical fitting stringer to maintain the shape of the hull skin. - Grandad

Yes and no. Since the Glass carries most of the load and the wood is basically the "Form" and also most stringers don't have enough glass layers to work soley by itself, It's really important for the Wood and Glass to be working in unison with each other. For that to happen the wood need to be adhered to the glass and the hull. If you use enough layers of glass, with no Voids in the lams, then you don't even need the wood. It could rot away and the boat would still be structurally sound. Attempting to use the "Channels" left after the wood has rotted, makes it difficult to achieve this needed bond. Not that it can't be done but in most cases the glass is not all that good either and it's best to start from scratch. Some of the Vintage boats actually used cardboard as the "Mold/Form" for the stringer and then used mulitple layers of glass for the stringer. If the cardboard get wet and falls away, NO problem!!! The glass is what carries the load when the Glass laminations are thick enough. Most times it's not!!!!