9589Re: Model in relation to ballast
- May 1, 2005If you try to take all the factors into account, this subject soon
becomes very complicated. FOr example, it's not easy to scale down
the thickness and weight per unit area of the paint or varnish needed
to protect the surface of the hull. And to make it worse, although
the displacement and weight of a 1/4 scale model is 1/64 of the
original, its surface area is 1/4 x 1/4 = just 1/16 of the original.
That's why racing model yachts often have unpainted carbon-fibre
There are also considerations of stability and wind strength: you
can't scale down wind speed in proportion, yet the force exerted by
the wind is proportioanl to the square of its speed.
So it all depends on why you are building a model: is it to put on
the mantelpiece, to fool arond with in the swimming pool, or to sail
in real water with a real wind? There will have to be compromises
--- In Michalak@yahoogroups.com, "Ronald Fossum" <artemis@p...> wrote:
> 1/4" x 1/4" = 1/16" and plywood down to 1/64" thickness is
available in most hobby stores that cater to the model airplane crowd.
> If you give the entire boat a couple of coats of varnish (to seal
it for floating purposes) and then a coat of paint, you'll
approximate the weight of fiberglass, resin. and boat paint.
> Ron Fossum
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