Bill:
I think you will find the 5/32 rods adequate for what type of launches it
was designed to handle. Sure the wings flex as do the rods, but that's some
built in safety. Just use a medium weight hi start and enjoy. Its a great
airplane.
Stan
----- Original Message -----
From: "Bill Harris" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, July 22, 2001 9:23 AM
Subject: Re: [RCSE] Joiner sizing
> 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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