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Forming rounded corners with Fiberglass and ply.

  
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Lew Hodgett

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Since: Jun 30, 2003
Posts: 125



(Msg. 16) Posted: Mon Aug 27, 2007 8:21 pm
Post subject: Re: Forming rounded corners with Fiberglass and ply. [Login to view extended thread Info.]
Archived from groups: rec>boats>building (more info?)
<doublesb DeleteThis @hotmail.com> wrote:

> I must be missing something here. A dodger is just a roof. Why all
the
> epoxy and glass? I wouldn't use any glass and just use wood and
epoxy
> for sealing. You should be able to build it in place and wood is
alot
> easier to work with than glass. Either paint it or leave it natural.

This is going to be a large, say 12x12 rigid dinghy that will support
a solar panel farm.

Wood is heavy, wood will rot, and wood is weak when compared to a foam
core complete with knitted glass and epoxy skins.

The above structure would add a lot of weight high above the water
line if made of wood.

Just for reference, a 4x8x1/2 sheet of plywood weighs about 42#, while
a 4x8x3/4 sheet of Divinycell weighs about 16#-17#.

Lew

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cavelamb himself

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Since: Aug 18, 2007
Posts: 38



(Msg. 17) Posted: Tue Aug 28, 2007 4:37 pm
Post subject: Re: Forming rounded corners with Fiberglass and ply. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Lew Hodgett wrote:

> <doublesb.RemoveThis@hotmail.com> wrote:
>
>
>>I must be missing something here. A dodger is just a roof. Why all
>
> the
>
>>epoxy and glass? I wouldn't use any glass and just use wood and
>
> epoxy
>
>>for sealing. You should be able to build it in place and wood is
>
> alot
>
>>easier to work with than glass. Either paint it or leave it natural.
>
>
> This is going to be a large, say 12x12 rigid dinghy that will support
> a solar panel farm.
>
> Wood is heavy, wood will rot, and wood is weak when compared to a foam
> core complete with knitted glass and epoxy skins.
>
> The above structure would add a lot of weight high above the water
> line if made of wood.
>
> Just for reference, a 4x8x1/2 sheet of plywood weighs about 42#, while
> a 4x8x3/4 sheet of Divinycell weighs about 16#-17#.
>
> Lew
>
>
That's for the foam panels only.

Add the glass and epoxy and it will be nearer 43 pounds Smile

 >> Stay informed about: Forming rounded corners with Fiberglass and ply. 
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Lew Hodgett

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Since: Jun 30, 2003
Posts: 125



(Msg. 18) Posted: Tue Aug 28, 2007 4:37 pm
Post subject: Re: Forming rounded corners with Fiberglass and ply. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"cavelamb himself" wrote:

> That's for the foam panels only.
>
> Add the glass and epoxy and it will be nearer 43 pounds Smile

The total weight is a function of the number of layers of glass in the
skins, so the total weight probably exceeds 43#, but did you bother to
calculate the stiffness of the foam/glass sandwich which is what truly
drives the design?

Lew
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OldNick

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Since: May 20, 2007
Posts: 29



(Msg. 19) Posted: Tue Aug 28, 2007 11:46 pm
Post subject: Re: Forming rounded corners with Fiberglass and ply. [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Mon, 27 Aug 2007 20:21:58 -0700, "Lew Hodgett"
<lewhodgett DeleteThis @earthlink.net> wrote stuff
and I replied:

>This is going to be a large, say 12x12 rigid dinghy that will support
>a solar panel farm.
>
>Wood is heavy, wood will rot, and wood is weak when compared to a foam
>core complete with knitted glass and epoxy skins.

Canoes and Kayakers will disagree. I had this discussion with one of
the SNGlue/Strip kayakers, and they were very strong about wood vs
foam....either snglue or strip.

However, I have to admit that if the result is stiffness, noit inpact
strength, then fioam wins at a given weight.


>
>The above structure would add a lot of weight high above the water
>line if made of wood.

But not if made of wood (strip or sng ply) with the same skins or less
(agaon local impact strength)
>
>Just for reference, a 4x8x1/2 sheet of plywood weighs about 42#, while
>a 4x8x3/4 sheet of Divinycell weighs about 16#-17#.

For this purpose you need quite thin ply...1/4 or 3/8, and then less
glass or WHY because it's better for puncture.

Moot point. Just presenting the other POV. In my time I have tried
both, and find it hard to really fight one way or the other.

>
>Lew
>

Human bevaviour: Bestiality with a brain
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cavelamb himself

External


Since: Aug 18, 2007
Posts: 38



(Msg. 20) Posted: Mon Oct 15, 2007 8:50 am
Post subject: Re: Forming rounded corners with Fiberglass and ply. [Login to view extended thread Info.]
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