Richard (Rick) Karlquist wrote:
>> What I worry about in that case is oscillation under the right wind
>> conditions.
>
>> Roger (K8RI)
>
> After much experimenting, I have learned something about the oscillation
> problem:
>
> 1. The worst design is a uniform diameter vertical guyed at equal
> intervals. This is somewhat obvious from physics.
>
> 2. Tapering the diameters is very helpful.
>
> 3. For really flimsy verticals, I guy every 15 feet
>
> 4. Oscillation may not cause immediate failures, but instead
> the cumulative effects of fatigue will eventually reach the breaking
> point.
Particularly with aluminum..(DeHavilland Comets and all that)
What about wrapping a rope in a spiral around the outside of the element
to kill the aeolian vibration (like they use on car antennas these days)?
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