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Model Forum / Radio Controlled / Water Models / April 2007



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1.26m scale model - how to make a mould to reproduce the hull

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Rüdiger Leibrandt - 24 Apr 2007 12:35 GMT
Hello!

I am currently building - since about a year actually as I am low on time -
a 1:200 scale model of the Tirpitz. As the Bismarck has exactly the same
hull, I wanted to make a copy of the hull that I am currently building -
and, as the wooden framework inside the ship eats a lot of space, I was
actually considering making 2 copies of the hull consisting only out of
fiberglass and with no internal wooden skeleton.
But how to I take a copy of a 1.26m glassfiber hull?
Any experiences, suggestions, ideas?
I was currently thinking about taking liquid latex, like sold in sex-shops,
acover the hull with that and then place it inside a papermache-bath. And
when that would have hardened, pull off the latex cover, place it in the
papermache and then put the glassfiber-mats in there, eventually affixing
them with thumbtacks which could later on be grinded away from the hull.

That sounds reasonable?
al6600 - 24 Apr 2007 14:36 GMT
although im no expert i believe that you should make a mould using
fiberglass so that it does not flex to much. then it will last a long
time and you could make many hull's from it.

you need to seal the origonall hull with paint then several coats of
wax,also make sure there are no overhangs or negative angles which
would prevent the mould coming off. then apply about 2-3 layers of
fiberglass and once set hopefully the mould will come away fairly
easily.

i might have a "how to" on my computer somewhere if you want i will
look for it.

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al6600

al6600 - 24 Apr 2007 14:41 GMT
i found the file if you want a copy let me know and i will email it to
you. its not my own work i got it from the internet.

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al6600

v_tolias - 24 Apr 2007 16:50 GMT
can i have this "how to"!!
My email: v_tolias@yahoo.gr
Thank You..

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v_tolias

al6600 - 24 Apr 2007 20:04 GMT
its on my computer at work will email you it tomorrow :)

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al6600

v_tolias - 24 Apr 2007 22:55 GMT
Thanks a lot!!

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v_tolias

Thin water - 25 Apr 2007 05:43 GMT
My thread on making a mold from a home made hull form will be on within
the week and the completed mold done within two weeks.

If you value the wooden one you made it might not be a good idea to use
as a plug. All of my plugs suffer some damage, some are total losses but
that is OK because the first thing I do with a new mold is lay up a new
plug in it that can be used to make bunches of additional molds if
needed. Since the new plug is made of gelcoat over fiberglass a new
mold can be made from it with no damage.

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Thin water

 
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