[TowerTalk] Ham IV Rotor

[K8RI on Tower talk]

>
> On Oct 21, 2005, at 1:46 PM, Tim G. Boerresen wrote:
>
>> Hello Tower-Talkers,
>>
>> I found an old HAM IV, which look suitable for my current antanna
>> project.
>>
>> I have one question though, that I haven't foud an answer to using
>> goole.
>> How much weight is a HAM IV sized for? That is the vertical pressure.
>
> According to this page, a Ham-IV will support 800 lbs:
> http://www.rotordoc.com/sales.html

This is for a laterally supported load (no side, or tipping forces).

My opinion:
I'd be very uncomfortable with more than half that on a Ham M or Ham IV, BUT 
even 400# is a *lot* of weight. Not many ham antenna instalations get that 
heavy.  Even my large array with mast is probably not much more than that 
(*maybe* 600# ).  So, with that in mind I'd not be uncomfortable swinging 
any large tri-bander or reasonable size monobander well within the wind area 
limits.

I like the Ham series of rotators, but the one thing I don't like for large 
rotational forces is the brake.  Even on a medium tri-bander I think they 
are fine, but on something with a lot of wind area, that sucker can come 
around in a hurry when you release the brake on a windy day.  OTOH the HDR 
series uses an on/off switch instead of the spring loaded one used on the 
ham series, so I much prefer the Ham series if the wind load is within 
reason.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com

>
> Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
> Quote: "Not within a thousand years will man ever fly!"
>             -- Wilbur Wright, 1901
>
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