Re: [TowerTalk] T-bars (capacity hats) was: Re: Aluminum tubing insert overlap...

[Jim Lux <jimlux@earthlink.net>]

On 9/17/11 4:41 AM, Pete Smith wrote:
> About T-bars -- does anyone else remember pictures of Sigma 80 yagis
> broken at the junction between the T-bars and the elements?  I think I
> recall one station where all 4 broke (on a 2-element).
>


T junctions are tough to design to be strong.  You have these big lever 
arms for bending moments, and it's easy to wind up concentrating all the 
stress at one point by inadvertently making something too stiff.


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