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## Rohn 25 Fold Over Calculation

 To: Rohn 25 Fold Over Calculation force12e@lightlink.com (Natan Huffman) Sat, 12 Oct 1996 17:42:22 -0400
 ```Ladies and Gents..... I have one of those damn Rohn 25 foldover towers and am trying to figure out how to compute the stresses on the top section and hinge. Any of you engineering types know how to do it? Here is my situation I need to figure the amount of force generated by a specific tower configuration. The tower is a hinged tower (Rohn 25 Foldover) that has a hinge 35' above the base. Another 35' extends beyond the hinge upwards. Additionally, the tower has a mast in it that protrudes 15'. In the past I have put up arrays and masts that weigh 100 lb.. with the top antenna weighing 35 lb. and placed at the very top of the 15' mast. What I need to figure out is what decrease in force on the hinge and top sections can I see by moving the antenna down to the bottom of the mast (at the 72' level.) If the reduction is significant, I can put up another antenna! Any ideas? If I can do it, I want to put the FORCE 12 EF180A (30 lb.) about 5' above the 2 el 40. Had the 40 (38 LB) at the top and would like to move it down to the thrust bearing and put up the 80 meter rotatable if the forces are less than what I saw with the 40 at the very top. You know how to calculate such things? Natan W6XR/2 Natan -- FAQ on WWW: http://www.contesting.com/towertalkfaq.html Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: K7LXC@contesting.com Sponsored by Akorn Access, Inc & KM9P ```
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