Hi Bob,
You may have hit on the answer. I sure wish there was someone at Rohn to
answer this stuff . . . If I
ask, I am sure they will tell me that those calculations were made so long ago
that nobody there has
any idea how it was done and they threw out all the paperwork years ago . . .
but if I REALLY want to
know, they will recalculate it for me for a HUGE fee . . .
45G sections actually weigh closer to 70 pounds but that still comes out fairly
close. Again, the
difference we are seeing could be "safety factor".
Stan
w7ni@teleport.com
Bob & Traudel Eslaire wrote:
> Stan,
>
> Perhaps the difference can be attributed to the weight of that portion of the
> tower from the hinge
> to the apex. I did a quickie calculation using 60 lbs per 10' section (I'm
> not near my Rohn books)
> and came up with 3675 ft-lbs for the tower part. Add that to the 135 lbs at
> 35' from the hinge
> (4725 ft-lbs) and you get 8390 ft-lbs as the estimate. Not too far off.
>
> Bob, W9UI.
--
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|