Snao G's

[Bill Glaze]

Bob:
Actually, a square section turned on edge, making a diamond, would 
probably offer more strength.  Dick Hanson offered an idea that I found 
appealing:
Cut a strip of plywood, 1/16 or 3/32 in, long as the tube.  Cut it so it 
will just slide inside the tube snugly.  Slide it in, on edge, sitting 
vertically.  (The plywood sitting vertically, not you!) You have now 
added a whole lot of strength to the tube.  You've prevented 
collapse/bending of the walls, and increased the modulus of bending.  
Works well.  If I were one of the folks bending wing tubes, I wouldn't 
hesitate for a moment to try it.
Bill Glaze

Bob Richards wrote:

> I'm sitting here thinking that "tubes" are not the best cross section 
> for our purposes. I think we only use them 'cause they are easy. It 
> would make much more sense from a structure standpoint to use 
> something like a box or I-beam.
>  
> Bob R.
>
>
> rcaerobob at cox.net wrote:
>
>     Yeaop. That works out to about 147 lba (assuming a 10.5lb plane)
>     distributed on that 7/8" dia wing tube, with complete
>     concentration of the G's likely at the fuse/wing root
>     intersection, with some load distribution laterally, but I'd bet
>     not much.
>
>     How many of us ever "test" our wing sockets to 150 lbs!!!!
>
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