Subject: | Re: [TowerTalk] Weight of mast material |
---|---|
From: | Mahlon Haunschild <mahlonhaunschild@cox.net> |
Reply-to: | mahlonhaunschild@cox.net |
Date: | Tue, 20 Jan 2004 21:41:08 -0600 |
List-post: | <mailto:towertalk@contesting.com> |
I don't know about the mast per se, but your overall plan concerns me. Assuming that the 40m antenna you are talking about is the Cushcraft XM240, a little math shows: Weight Wind area (sq ft) mast 90 2 (est.) C31XR 82 10.7 XM240 55 5.5 totals 227 18.2 Rohn 25G is only rated for 8 sq ft at 70 ft. & 110 mph per their drawings (you are in 105 mph land, per EIA/TIA 222, so you need to design for that). Also, 227 lbs rotating weight is a LOT for the 25G structure to withstand. How will you control the torque caused by the antenna stopping & windmilling? If you're married to the idea of a 70 ft 25G tower, one thing you should do is get an aluminum alloy mast. Cuts down the weight dramatically. Another thing to do would be to not use a 40m beam. regards, Mahlon - K4OQ Julio Peralta wrote: Thanks to all who replied RE: the weight of Chromolly. I think it would be safe to figure it a about 90#. _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk |
<Prev in Thread] | Current Thread | [Next in Thread> |
---|---|---|
|
Previous by Date: | RE: [TowerTalk] grounding, Eric Scace K3NA |
---|---|
Next by Date: | Re: [TowerTalk] grounding, Mahlon Haunschild |
Previous by Thread: | [TowerTalk] Weight of mast material, Julio Peralta |
Next by Thread: | Re: [TowerTalk] Weight of mast material, Arne Gjerning |
Indexes: | [Date] [Thread] [Top] [All Lists] |