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## [TowerTalk] Re: TowerTalk Digest, Vol 6, Issue 35

 To: [TowerTalk] Re: TowerTalk Digest, Vol 6, Issue 35 CubexCo@aol.com (CubexCo@aol.com) Thu Jun 19 17:45:53 2003
 ```In a message dated 6/19/03 4:42:27 PM Eastern Daylight Time, towertalk-request@contesting.com writes: > Ok, mathemeticians and engineers out theree.. I need some help > > Have an MA-550 55' tower. I have a little over 7 sqr feet of antenna. A > Steppir (6sqr ft), a 40m D40 cushcraft dipole (1sqr ft) and a 2/440 verticle > (<0.25sqr fet). > > The The wind load capacity of the MA-550 at 50mph is a little more than 10 > sqr feet of antenna and at 80mph it is around 6sqr feet. This is based on > the antenna being around foot or so above the top of the tower. If I use > their 20ft reinforced steel mast and put the 3 element Steppir at 10 feet > above > the top of the tower and the D40 at the top, at 20 feet above. What does > that > do to it's wind loading capacity? > > Michael ============ Michael, A simple calculation is to ratio the height of the antenna attachment point times the known antenna area. or 6 * (1+54)/(9+54) = new area or 6*(55/63)= 5.2sq ft. Regards, Norman W4QN "The Power of a Cubex Quad" http://www.cubex.com/ ```
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