Towertalk
[Top] [All Lists]

best tower direction in prevailing wind

 To: best tower direction in prevailing wind n4kg@juno.com (T. A. Russell) Sat, 15 Feb 1997 09:34:31 EST
 ```Pat, I believe you have misconstrued each point I made. I did NOT say the tension in each guy was equal. Let me re-phrase my comment: If the wind comes from an angle that exactly bisects two guy wires, (perpendicular to a tower FACE), the tension in those TWO guy wires is EXACTLY EQUAL to the tension that would result in a SINGLE guy wire if the wind were coming in the direction of that single guy wire. The worst case is when the wind comes IN THE PLANE of a tower FACE (NOT perpendicular to the face), which is 30 degrees removed from a guy wire. This places one guy perpendicular to the wind and therefore there is no load on that guy, and the other guy is away from the wind, also carrying no load from the wind. The tension in the single guy (30 degrees from the wind) must be 15% higher than the wind force due to the 30 degree offset. I hope this "word" picture clarifies the situation. I do not have graphics capability on my E-mail. de Tom - N4KG On Fri, 14 Feb 1997 16:14:31 -0500 (EST) Pat Masterson writes: > >I dont understand your thinking on this: > >On Fri, 14 Feb 1997, T. A. Russell wrote: > >> >From the geometry of 3 equally spaced guy wires, >> it is evident that the load carried by the guy wires >> IS EXACTLY EQUAL with the wind coming in-line with >> a single guy or bi-secting a pair of guys. > > The guys on the back of the tower (lee side, down wind) will tend to >slacken a bit as the tower leans toward them. The cable inline to the >wind will obviously get tighter. The load on the cables (tension) cant > >ever be equal with some wind blowing. > >> >> The WORST CASE is if the wind is in line with a FACE >> of the tower, 30 degrees from a single guy wire, placing > > The face of the tower is 60 degrees from the guy cable. > >> ALL of the load on that single guy (direction) with an >> additional 15% load due to the geometry. > > If the wind is on a face, then the load is spread evenly to the 2 >guys >attached to each edge of that face. They get tighter, and the back guy > >gets looser. Where does that 15% get calculated from? >> >> FOUR WAY guying prevents the 15% additional load >> from geometric considerations, but puts an additional >> load on the tower due to pre-tensioning. > > Yep. More guy wires will add to tower compression. >> >> de Tom - N4KG >> >> > >*-----------------------------------------------------------------------------* >* Pat Masterson B38-01, Northrop Grumman, * Ham:KE2LJ >* Plant 1, South Oyster Bay Rd., * Packet: >KE2LJ@KC2FD.NY >* Bethpage, NY 11714 * President Grumman >Amateur >* email: bat@grumman.com Fone: 516-346-6316 * Radio Club WA2LQO >*-----------------------------------------------------------------------------* > > -- 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 & N4VJ / K4AAA ```
 Current Thread best tower direction in prevailing wind, Jonathan Starr best tower direction in prevailing wind, T. A. Russell best tower direction in prevailing wind, Wendell - W5FL best tower direction in prevailing wind, T. A. Russell <=