K8RI wrote:
> One thing I forgot to add in a previous post about rotors mounted down in a
> tower. When mounted "in the tower", but at the base there is no give to
> take up the stress and that small area takes the entire brunt of the torque.
> If the rotor has a mount on the concrete, or a seperate mount it removes the
> stress from the tower.
Actually, there's a lot of cushion provided by a long
mast.
I had an extended guyed 72' HDBX style tower in the 60s,
with the rotator a couple feet off the ground, rotating
a 4 el tri-band quad through 70' of 1-7/8" OD pipe. I
was amazed at the almost 45º twist in that mast in high
winds. It was ridiculous, really. I should have used
a 2-1/2" or 3" mast on that one.
Steve K8LX
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|