correx laminte

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Brett - 28 Sep 2003 21:11 GMT

Has anyone created a lamite using corroplast/correx, to create something
halfway between crunchie and foamie.

I want to make a light tailplane, but i want to cover it ultimately with
correx. Using outer skin laminate to take away the heat used in covering and
hide the fluted surface finish.

I have tried I thin ply laminate with correx centre. This was excellent but
too heavy by far.

I then tried using thin balsa and 2mm correx but the balsa would just crack
of chip off or flexed if it took an impact.

Anyone else got any suggestions or have tried anything else?

Brett

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reg - 29 Sep 2003 22:14 GMT

> Has anyone created a lamite using corroplast/correx, to create something
> halfway between crunchie and foamie.

Yes, but only as an experimental test piece. I used 2mm correx and coated it
with paper on each side. I used evostick as the adhesive. The result was
a piece of correx which was much stronger and resistant to flexing.

You will need to do both sides, if you only do one side it will bend out
of shape when the glue contracts as it dries.

> I want to make a light tailplane, but i want to cover it ultimately with
> correx. Using outer skin laminate to take away the heat used in covering and
> hide the fluted surface finish.

I have made tailplanes out of 4mm correx and covered them with easycoat.
If you are reasonably careful you can iron on the covering without any
problems. I use a small travelling iron for covering models... works
fine. The fluting shows but that is a small price to pay for a very
strong tailplane.

> I have tried I thin ply laminate with correx centre. This was excellent but
> too heavy by far.
[quoted text clipped - 3 lines]
>
> Anyone else got any suggestions or have tried anything else?

Only other thing I tried.... a piece of polystyrene foam coated with
greaseproof paper !!! I only coated one side and used PVA as the
adhesive, I also brushed the PVA into the greaseproof to soak it.
Coating only one side caused it to bend as the glue dried,
it also requires care to stop the greaseproof paper from forming
ripples. The result was amazing, the polystyrene was now virtually
unbreakable, I tried to bend it, hammered it against the bench, stood
on it and was convinced it was damn near unbreakable. I only made the
one test piece and haven't followed it up yet. You may get the same
result by coating polystyrene with PVA and 6 or 9 oz glass cloth. The
glass cloth would certainly be easier to wet out >:-)

If I get time and inclination it would be worth making a laminated
zagi type wing, should be indestructible >:-)))

Reg

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Brett - 30 Sep 2003 00:16 GMT

Thanks very interesting.

I wonder what thin EPP would be like. Although i dont know where i will find
EPP supply?
I suppose that would be higher density than polystyrene. I will get some
ceiling tiles an brown paper and see what happens. PVA should be fine or
maybe even 3m77 spray might do the trick.

What would have the lowest density. Brown paper or Strand tape? I may try
both.

Cheers

Brett

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> > Has anyone created a lamite using corroplast/correx, to create something
> > halfway between crunchie and foamie.
[quoted text clipped - 40 lines]
>
> Reg

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reg - 30 Sep 2003 19:24 GMT

> Thanks very interesting.
>
> I wonder what thin EPP would be like. Although i dont know where i will find
> EPP supply?

Sorry, can't help you there.. don't know a source of EPP.

> I suppose that would be higher density than polystyrene. I will get some
> ceiling tiles an brown paper and see what happens. PVA should be fine or
> maybe even 3m77 spray might do the trick.

For strength I would use the PVA.

> What would have the lowest density. Brown paper or Strand tape? I may try
> both.

I haven't used Strand tape so can't comment. Brown paper is strong, but
so is greaseproof. The greaseproof is easily available on rolls in a
supermarket (usually in the foil and cling film section) and is a lot
lighter than brown wrapping paper. Both brown paper and greaseproof
will be prone to wrinkle unless care is taken to get the air out from
underneath them.

I have used both 2mm and 4mm correx for different things. The 4mm is
very different, being both much stronger and far stiffer by comparison.
If you need to use 2mm for weight saving then it will be necessary to
laminate it by some means to gain the strength and stiffeness required.

I have a glider on which the balsa sheet tailplane fractured on the
first less than perfect landing, this was replaced with 4mm correx with
iron on covering and has lasted for months without any further problems.
The original tailplane was coated with glass mat but was no match for
the strength of 4mm correx >:-)

Good luck,
Reg

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Brett - 30 Sep 2003 22:41 GMT

Signature

today i fond some ver thin polystyrene in b&q. its normally used for
backing wapaper to make rooms warmer or something?!

i have made a nice tailplane using 2mm correx lamited wth the foam on
either side and then covered with tape. i have yet see if it stands up to
covering with film. but it looks good.

i have also trid polystyrene foam covered wth brown paper. it has yet dry
but looks good so far

Brett

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>
> > Has anyone created a lamite using corroplast/correx, to create something
[quoted text clipped - 41 lines]
>
> Reg

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Model Forum / Radio Controlled / Air Models / September 2003

correx laminte