Subject: [NEXTEL-1] Re: Wind Ratings

From: Marcel <[email-masked]>
Date: Thu, 16 Jan 2003 18:45:05 -0500

------- Original Message --------
   From: "Dan Simmonds" <[email-masked]>
Subject: Re:Wind Ratings

Bill, To calculate the surface area of mast material (we'll use your 1 1/2" OD mast in
this case) you take 1.5 (the diameter of the mast) and divide by 12 (one side of a square
foot). This gives you .125 sq. ft., or 1/8 of a square foot of exposed area. So an 8 foot
length of 1 1/2" material would give you 1 sq. ft. of flat surface area. Because a mast is
round, you can factor in a drag coefficient of 0.6. Some designers use different drag
factors than others, but I believe 0.6 is a good average to work with. Using this figure,
a 1 1/2" OD section of mast, 10' long, offers 6 tenths of a square foot of "round" exposed
mast area. Regards, Dan Simmonds

     ----- Original Message -----
     From: William Waugaman <[email-masked]>
     Sent: Thursday, January 16, 2003 3:46 PM
     Subject: Wind Ratings
      Does anyone know of a reference source to determine the wind ratings
     of various materials used for antenna masts. i.e. 1 1/2" conduit,
     water pipe, etc.

     We have to build our control/base station antenna installations on
     all city buildings to withstand category 2 winds (125 mph. I have the
     antennas, but would rather not guess on the masts.

     Thank you

     Bill Waugaman
     City of Virginia Beach, VA
     757-563-1858
     [email-masked]

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