[WWI] DML Wings Fokker Dr.1 and Spad XIII

[Ivan Carlos Ruchesi]

Diego Fernetti <dfernet0 at rosario.gov.ar> escribió:    >Hi Art!
> The saggy undersides seem impossible to fix. Are there any >replacements 
> for them?
> Same for the DML Spad XIII?

>>Perhaps they're a bit exaggerated (I can't recall that kit too well) but 
>take into account that undercambered wing profiles caused the fabric 
>covering to "balloon" in between ribs, because the taut fabric tends to 
>follow flat surfaces. The same effect, but reversed, can be seen in the >top 
>of the wings (a convex surface) by the slight dip at the apex of the rib 
>curves. In any case, this effect diminish at the leading and trailing >edges 
>of the wings, being the rib profiles less curved. And as you may have >seen, 
>many airplanes had riblets to minimize the airfoil distortion in between >the 
>ribs.
>As a remedy for the deep trenches in the wings undersides, I'd >carefully 
>sand the undersides, especially in the trailing edge areas. Rescribe >the rib 
>tapes with a slight pass of a hobby knife.
>D. 
   
   
  That´s right, the fabric wants to lay flat between the leading and trailing edges, so it hangs from the top and from the bottom of the ribs, the amount of this sag depending on the spacing between the ribs. I experienced this effect when covering an undercambered flying airplane model wing using tissue. But the effect is very subtle as photos can show...
   
   
  Ivan




       
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