[TowerTalk] DX Engineering 66-Foot Vertical?

[jimlux]

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)?