[TowerTalk] Yaesu Rotors

[K7LXC@aol.com]

In a message dated 06/11/2000 8:13:28 AM Pacific Daylight Time, 
n4zr@contesting.com writes:

> The K-factor is, at best, an unrealistic worst-case approximation of the
>  real load on the rotator.  The only array it is accurate for is one that
>  has all the weight, including the boom, located beyond the ends of the boom
>  at the turning radius!  Ever seen one of those?  The real moment is the sum
>  of all the weights and lever arms, from 0 feet out to the end of the boom.

    Well, yeah but let's get practical. This is not an engineering/lab 
exercise. Us amateurs just want an idea of load compatibility for towers, 
antennas, masts, rotators, etc. I don't think it's unrealistic and it IS an 
approximation. It doesn't take wind-induced mast/antenna torque into the 
equation either but it's REASONABLE.

    Personally I think the K-Factor/Effective Moment is a GOOD benchmark. It 
is admittedly an ESTIMATE by the manufacturer but is much better than the old 
'square footage' capacity that was used for years. 

     I would be delighted if you calculated and published the real sum moment 
for antennas and rotators that you elucidated above. What say?

Cheers,   Steve   K7LXC
Tower Tech 

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