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9589Re: Model in relation to ballast

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  • Howard Stephenson
    May 1, 2005
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      If 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
      hulls.

      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
      somewhere.

      Howard

      --- 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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