On 6/11/2015 10:07 AM, kr2q@optimum.net wrote:
Hi all,
2. What point is the weak link for the 200 pounds?
Here is the surprising thing I ran into with my HDX-5106,
a MUCH bigger tower. It has a MonstIR on top, figure
250 lbs. Also a short mast and a prop pitch, figure
another 50 lbs. Figure another 100 lbs for cables,
so lets call that 300 lbs. Should be fine.
What happens is that when I get within about 5 feet
of full extension, I start to get noise and vibrations.
The working theory is that this is due to IMBALANCE of
weight, rather than just the weight itself. The sections
start to bind a little when the overlap gets small.
I removed the antenna to change the cables in the tower,
and ran it up and down a few times, and the problem
went away under those conditions. The MonstIR has a
very flexible boom that exascerbates the imbalance
problem. Once it starts to lean a little, the boom
flexes in the direction that makes it worse.
What I am doing as a workaround is manually stopping
the raising winch just before the problem begins.
I know from experience where this point is.
Rick N6RK
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