How do you calculate how much load a steel tube 10 inch with .134 wall can handle with no guys 100 ft tall. Dan NN7J. -- Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail. ______
Well, there are beam bending formulas for distributed loading... the windload of the structure itself is nonnegligible, but it's a simple beam so it's straightforward to analyze. Take the formula for
Author: Robert Chudek - KØRC <k0rc@citlink.net>
Date: Thu, 31 Aug 2006 12:29:12 -0500
Dan, You can put your numbers through the WD9P mast calculator and see what you get, Here's the URL: http://www.math.niu.edu/KARC/mast/ I put your numbers into the calculator, just out of my own curi
Author: Robert Chudek - KØRC <k0rc@citlink.net>
Date: Thu, 31 Aug 2006 13:00:43 -0500
Digging around in the archives I learned it was Telrex that manufactured the "Big Bertha" system in the 1950's ~ 70's. Rich, KE3Q, had a good write-up about this company and their product line. This
Red, By my calculations the drag on pretty much any antenna element is going to be turbulent, and certainly so for a tens of miles per hour wind. The kinematic viscosity of air is around 1.3*10^-5 m^
*snip* In other words, it's not safe to put this tube up unguyed. The Array Solutions Big Berthas seem to have a pretty substantial stepped taper to them and appear to be a couple feet in diameter a
Red, By my calculations the drag on pretty much any antenna element is going to be turbulent, and certainly so for a tens of miles per hour wind. The kinematic viscosity of air is around 1.3*10^-5 m^
This kind of structure is actually fairly common for things like advertising signs and highway illumination, so I would imagine there are (expensive) cookbook products out there. Going to a 1/2" wall