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Re: [TowerTalk] G-1000DXA failure with lower mast clamp

To: <>
Subject: Re: [TowerTalk] G-1000DXA failure with lower mast clamp
From: "Chuck" <>
Date: Tue, 27 Dec 2011 08:29:32 -0600
List-post: <">>
Hi Barry,

Glad you didn't have damage to the beam.  I don't know much about the 3el 
Steppir, but that seems like a lot of antenna for a mast mounted rotor. The 
antenna wobbles back and forth, loosening the bolts. A stick of Rohn 25 with 
a rotor shelf might serve you better.  The weakest point will fail.  If the 
bolts drop out when the rotor is on a shelf, it just twists.  As for this 
rotor, I think I would be ok with using it.  Three bolts should hold it and 
it looks like you could still catch a few threads on the fourth.

Good luck,

Chuck W5PR

----- Original Message ----- 
From: "Barry N1EU" <>
To: <>
Sent: Tuesday, December 27, 2011 8:16 AM
Subject: [TowerTalk] G-1000DXA failure with lower mast clamp

> My G-1000DXA rotor came completely unhinged from its GC-038 lower mast
> clamp and left my 3-el Steppir and attached rotor dangling from the
> attached cables.  It appears that the attachment bolts on the bottom
> of the rotor came loose and fell out.  Please see photo at
> The cast aluminum fractured at one of the four threaded holes on the
> rotor bottom.  At first I thought this might be the cause of failure
> but on further thought, I would guess that the other 3 bolts came
> loose and fell away and this fourth bolt was the last to stay attached
> and this caused the aluminum fracture.  Any comments on whether this
> seems correct?
> I'd also appreciate comments on why this happened in the first place
> and how to prevent a repeat.  The rotor was assembled to factory
> instructions with lock washers.  Instead of using anti-seize on those
> four bolts, perhaps what is really needed is loctite?
> Does the motor casing need replacement and if so, is this a fairly
> easy job to do myself?  There's still about half the threads on the
> one hole that suffered the fracture.
> Thanks & Happy Holidays,
> Barry N1EU
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