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[Towertalk] Ham M slippage?

To: <>
Subject: [Towertalk] Ham M slippage?
From: (
Date: Wed, 1 Jan 2003 10:50:22 -0600
I *believe* the brake wedges in the HAM-M are 'rounded',
sort of like a bunch of 'speed bumps' around the base of
the rotor on the inside.  The brake wedge fits between those
bumps.  If you have a high torque antenna (long boom, 
large area antenna), the wedge can be dragged over those
bumps, wearing them down.  A new rotor bottom cover
might (temporarily) solve the problem.  A permanent fix
would be a rotor with a stronger brake such as the tailtwister
(which has it's own problems...the brake wedge tends to jam
in the Square brake bumps).  I'm not sure if the HAM IV
has higher 'bumps' than a HAM-M.  Perhaps the Rotor Doc
or Norm's can tell you.   

73 / GL,  Tom  N4KG

On Wed, 01 Jan 2003 GEORGE PRITCHARD <> writes:
> Thanks to all who responded. The rotor is pinned to the mast pipe, so 
> the mast cannot slip in the U-bolts. When the rotor "slipped", the 
> control indicator always matched the slippage, so I know that it was 
> the rotor slipping and not any of the U- bolts. I actually watched 
> the indicator move about 30 degrees in two seconds and stop during 
> the big wind gusts. I suppose if the wedge slipped over the bell 
> houising during the wind gusts, and that all the gears moved as well 
> as the motor shaft. I think I'm lucky that the gear teeth were not 
> sheared off. All seems fine today. The wedge brake holds the rotor 
> when I power the motor while leaving the brake engaged for a quick 
> test, but I'm sure this is no comparison to the wind stress 
> experienced the other night.The cubex heavy duty 1.5 inch rigid 
> spreaders are really strong, I hope it all stands up to ice loading 
> this winter... I let you all know. Happy new year,
> George AB2KC 
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