Subject:
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Re: New entry for ISCC: "Missing in Action" - Ju 52 airplane
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Newsgroups:
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lugnet.adventurers, lugnet.general
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Date:
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Wed, 19 Dec 2001 13:30:41 GMT
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Viewed:
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64 times
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In lugnet.adventurers, Fredrik Glöckner writes:
> "Scott A" <eh105jb@mx1.pair.com> writes:
>
> > Every time I see it I always wonder why the fuselage and wings are
> > covered in corrugated iron(!) - a feature you have kept in your
> > models. The only reason I can come up with is that the designers
> > thought it would reduce skin friction? Does anyone know?
>
>
> I think it was to save materials cost and weight. The corrugated
> shape of the metal made it more rigid. Hence, less metal was needed
> to preserve the rigidity of the surface.
That is exactely right. Corrogated sheets of metal have a much better
weight / bending-strengthness ratio than flat ones.
But you have two main disadvantages:
- the air friction gets higher (because the surface area increases - the modern
shark skin effect uses micro-turbulences to reduce the resistance, but that
did not work in this case).
Because of the high friction the Ju was designed for low speed, where air
friction influence is not so dominant.
- second disadvantage is the following: you can bend corrugated metal sheets
only in one dimension. So you can only make up conical and cylindrical shapes.
It is not possible to bend these sheets to balls or other shapes with more than
one bending axle. (One can see that quite good in the link Fredrik has given).
>
> The Citroën H van from the 50-ies also used corrugated metal for the
> body.
And Gianluca did a genius Lego-Design from that vehicle:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=16212
and followings...
Kind Regards,
Ben
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