Question about epoxy resin chemistry..

Blueskies wrote:
Me thinks the 'panels' are riveted on semi-cured because in the good ol' days when resins cured they were brittle. These
are simply skins on the wing and they are not adhered via the resin; the resin is supposed to be slightly green to allow
it to conform to the airfoil without cracking.

Lay out the panels on a big piece of glass and it will be pin hole free when you pull it off. The panel can be trimmed
to size while still on the glass. How many layers of what kind of glass are used in the lay-up? How sharp is the
tightest bend?


Wow. Big piece of glass. The skins will be a triangle with 8ft sides.
The plans specify two layers of 7.5 or 10oz glass. They extend up to
the 1" radius of the leading edge, but don't actually go around it.

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions
have any other suggested way to lay up the panels?

As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you
don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the
http://www.westsystem.com/ site? Good stuff...

--
Dan D.



..
"Ernest Christley" wrote in message om...
Blueskies wrote:
Me thinks the 'panels' are riveted on semi-cured because in the good ol' days when resins cured they were brittle.
These
are simply skins on the wing and they are not adhered via the resin; the resin is supposed to be slightly green to
allow
it to conform to the airfoil without cracking.

Lay out the panels on a big piece of glass and it will be pin hole free when you pull it off. The panel can be
trimmed
to size while still on the glass. How many layers of what kind of glass are used in the lay-up? How sharp is the
tightest bend?


Wow. Big piece of glass. The skins will be a triangle with 8ft sides.
The plans specify two layers of 7.5 or 10oz glass. They extend up to
the 1" radius of the leading edge, but don't actually go around it.

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Blueskies wrote:

Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions
have any other suggested way to lay up the panels?

As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you
don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the
http://www.westsystem.com/ site? Good stuff...

--
Dan D.

.

I've been told that West does indeed make a laminating resin,
but this isn't it.

West 105/205 is absolute best stuff I've ever used - on wood.

It will probably be great on wood/foam structures.

But it's not what I ever use (again) for laminating glass fabrics.

I used to use Dow 330 / 147(?) but my source quit carrying it
(because I was the only one buying it?)

My impression is that resins like 330 that don't use MDA (Methyl
Diethel Amines???) share a common "problem". At low temperatures
they tend to "separate out". The resin has an odd lumpy look on
the surface and there will be a lump of soft rock candy in the center.

It is real simple to correct by immersing the resin container in hot
water for a while. When the soup is clear again, it's ready to use.

But if the resin is at all "crystallized", it won't completely set -
ever.

It even says so in the directions!
For those who read such things...

Got AeroPoxy(?) last resupply to make a new cowling for Leo's
Super Zodiac. I've used it before, no complaints (other than the
MDA toxicity?).


So, what is it that you are building?

Richard

Richard Lamb wrote:
Blueskies wrote:

Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions
have any other suggested way to lay up the panels?

As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you
don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the
http://www.westsystem.com/ site? Good stuff...

--
Dan D.

.


I've been told that West does indeed make a laminating resin,
but this isn't it.

West 105/205 is absolute best stuff I've ever used - on wood.

It will probably be great on wood/foam structures.

But it's not what I ever use (again) for laminating glass fabrics.

I used to use Dow 330 / 147(?) but my source quit carrying it
(because I was the only one buying it?)

My impression is that resins like 330 that don't use MDA (Methyl
Diethel Amines???) share a common "problem". At low temperatures
they tend to "separate out". The resin has an odd lumpy look on
the surface and there will be a lump of soft rock candy in the center.

It is real simple to correct by immersing the resin container in hot
water for a while. When the soup is clear again, it's ready to use.

But if the resin is at all "crystallized", it won't completely set -
ever.

It even says so in the directions!
For those who read such things...

Got AeroPoxy(?) last resupply to make a new cowling for Leo's
Super Zodiac. I've used it before, no complaints (other than the
MDA toxicity?).


So, what is it that you are building?

Richard

Dyke Delta JD-2. http://www.ernest.isa-geek.org for the whole story.
The skins, turtleback and cowling are all fiberglass. Some builders
have also glassed the belly, tailfin and control surfaces (plans call
for fabric there).


--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Ernest Christley wrote:

Richard Lamb wrote:
Blueskies wrote:

Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions
have any other suggested way to lay up the panels?

As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you
don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the
http://www.westsystem.com/ site? Good stuff...

--
Dan D.

.


I've been told that West does indeed make a laminating resin,
but this isn't it.

West 105/205 is absolute best stuff I've ever used - on wood.

It will probably be great on wood/foam structures.

But it's not what I ever use (again) for laminating glass fabrics.

I used to use Dow 330 / 147(?) but my source quit carrying it
(because I was the only one buying it?)

My impression is that resins like 330 that don't use MDA (Methyl
Diethel Amines???) share a common "problem". At low temperatures
they tend to "separate out". The resin has an odd lumpy look on
the surface and there will be a lump of soft rock candy in the center.

It is real simple to correct by immersing the resin container in hot
water for a while. When the soup is clear again, it's ready to use.

But if the resin is at all "crystallized", it won't completely set -
ever.

It even says so in the directions!
For those who read such things...

Got AeroPoxy(?) last resupply to make a new cowling for Leo's
Super Zodiac. I've used it before, no complaints (other than the
MDA toxicity?).


So, what is it that you are building?

Richard

Dyke Delta JD-2. http://www.ernest.isa-geek.org for the whole story.
The skins, turtleback and cowling are all fiberglass. Some builders
have also glassed the belly, tailfin and control surfaces (plans call
for fabric there).

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber


I remember now, Earnie. Sorry.

What you really need is a store window that you can make up some
flat glass panel stock on.

I've never done one that size before, but I've laid up light flat
stock on the glass patio door...

Advice? CLEAN it first! Sterile is good.

Then spray a coat of PVA, and slap it up there.

I used a 5 mill plastic cover over the wet fiberglass,
and a piece of plywood for a pressure plate

Vacuum would work better, of course, but I couldn't hook
the TV up to the glass door (TV sucks, doesn't it!)

So what did Dyke recommend?

Richard

Richard Lamb wrote:

So what did Dyke recommend?

Richard

He's at Sun'n'Fun. Waiting for him to check back in to our email list.
I do like the store glass window idea, though. I have an uncle who
'collects' that sort of thing. Time to investigate.

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Big piece of glass...again!

--
Dan D.



..
"Ernest Christley" wrote in message . ..
Richard Lamb wrote:

So what did Dyke recommend?

Richard

He's at Sun'n'Fun. Waiting for him to check back in to our email list.
I do like the store glass window idea, though. I have an uncle who
'collects' that sort of thing. Time to investigate.

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber

Blueskies wrote:
Yes, I guess that would be a big piece of glass (don't take anything out of context here!). Do the plans/instructions
have any other suggested way to lay up the panels?

The directions say to lay it up on a couple pieces of MDF laid
side-to-side, with a piece of tape down the center. I have to cut forms
for the stainless steel ribs, so I thought an improvement on this
technique might be to use the forms to shape the MDF so that the
resulting layup is nearly the correct shape already. Very little
bending==very little built up stress.

The biggest improvement would be not to have to make the skins at all.
I've looked at G-10 and FR4, and have found several manufactures with
lots of data sheets. Reading them, I keep hearing that eerie refrain,
"You are in a maze of rooms, all slightly different..."


As far as bending the finished panels, a two layer lay-up will be quite flexible, even fully cured, and as long as you
don't have to wrap around the LE I'm sure you will not have any problems with cracking. Have you looked at the
http://www.westsystem.com/ site? Good stuff...


Looked there. Good stuff...IF you're building a boat, or a trailer, or
a chair. Goes back to what I said before. Every manufacturers claim
that what they have is good for whatever you're doing. While that just
may be true, but I don't trust it to be, and it is so much unfamiliar
territory that I just keep getting lost. What I need is a map to help
seperate the hype from the information.

--
http://www.ernest.isa-geek.org/
"Ignorance is mankinds normal state,
alleviated by information and experience."
Veeduber