On that Windfree project where I'm upgrading the wing joiner rod and spar to
make a stronger wing...
The stock Windfree has a pair of 5/32" joiner rods, one at the mail spar,
the other in a joiner box at 2/3 chord enclosed by the wing center/root
sheeting (no secondary spar). As a conservative and weight-saving
enhancement, I decided to use a 1/4" wingrod. However, while fiddling
around with the joiner rod weights, I noted that the TWO 5/32" rods have the
same cross-sectional area as the ONE 1/4" wingrod. So I wonder if I'm
side-stepping with the 1/4" wingrod in place of two smaller rods? In other
words, do the two 5/32" rods have the same "stiffness" or Sigma value as one
1/4" rod? I can see that the stiffness of a rod is proportional to the
size, but I'm not sure if it's a direct proportion.
--Bill
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