[WWI] 1/144 scale WWI aircraft

[Graham Hunter]

The only problem with Eduard kits (pre Camel) was with the exaggerated wing
ribs. Scaling the amount of sag up to 1:1 would produce an aeroplane that
can not fly. Look at any photo of any WWI aeroplane and you will see no
visible sag whatsoever. Eduard was not the only guilty party here though, as
the Spin Bristol M1C required a long date with the sanding block.

 

Graham Hunter

 

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From: wwi-bounces at wwi-models.org [mailto:wwi-bounces at wwi-models.org] On
Behalf Of Ivan Carlos Ruchesi
Sent: February 21, 2008 8:30 AM
To: World War I Modeling Mailing List
Subject: Re: [WWI] 1/144 scale WWI aircraft

 



Diego Fernetti <dfernet0 at rosario.gov.ar> escribió: 


 the fabric representation sags down on the lower surface of the wings
looking correct to me
(on the Eduard triplane it sags up).

>While trying to imagine how something may sag up (this knowledge >can be
>useful someday),

 

That effect is produced by the dope when tautening the fabric, so the upper
covering wants to descend to the trailing and leading edges level when
shrinking (it would go down to the straight line connecting the wing edges,
but the fabric being attached to the ribs prevent it to do so). 

On the underside, the covering also wants to descend to the edges level, so
the fabric sags between the ribs. All this is due to the ribs upper and
lower curvatures.

 

 

> I see that you are concerned about the lower surfaces of
>the Eduard kit. The relative indentation of the ribs is a result of the
>tight fabric around a wing with a slight undercamber. Perhaps it's a >bit
>exaggerated on a 1/72 kit, however this appareance is realistic in >some
>degree, while protruding ribs on the uderside, on my point of view, are
>always innacurate.

 

 

I agree, but this effect is very subtle and depends on the rib spacing,
closer ribs reducing the fabric sag and viceversa.

 

 

Ivan

 

  

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