I think you are a bit overloaded with that tower. The tower is rated
for 16 sq ft at 70 mph and the MonstIR has a load of 23.9 sq ft. I'm
not sure how the rating goes up as you lower the tower, but I would
expect a significant increase. I have tried to get that information,
but US Tower doesn't rate them like that and won't give out any info.
Another item of concern, and this is the reason I chickened out putting
a MonstIR on a crankup which was rated to handle the windload. Because
of the size, those antennas can put a lot of torque on a tower. If you
look at the HDX series of crankups the only thing resisting that torque
is 3 little ears. If those bend, the tower is jammed. I was unable to
get any torque rating information out of US Tower.
Jerry, K4SAV
Mark Robinson wrote:
>I am starting the planning phase of my tower. I am thinking of installing a
>Texas Towers HDX-589MDPL crank up tower. I would like to put a MonstIR beam on
>it. I am concerned with the windloading - fully extended I don't think that I
>have enough safety margin - I believe that the Steppir has a windload of
>around 30sq feet.
>
>Can I guy this tower at the top to get a better wind loading or should I leave
>it at say 50 of 60 feet most of the time? Does anyone know how the max
>windloading figure increases as the tower is nested?
>
>What would be the recommended rotor for a beam of this mass - I want the
>installation to hold up in our rough summer storms. I am located in North
>Carolina
>
>
>thanks Mark N1UK G3ZZM
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