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Re: [TowerTalk] HAM IV rotor / mast slipping

To: "'Frank'" <>, <>
Subject: Re: [TowerTalk] HAM IV rotor / mast slipping
From: "Bill Parry" <>
Date: Thu, 5 Apr 2012 10:52:45 -0500
List-post: <">>
The idea of drilling and pinning seems like a real good idea but there are
drawbacks.  I have been tempted on several occasions but have always backed
away.  I just seems like not having it pinned gives you a little safety
valve in case the wind gets too high. Would you rather reorient you yagi or
have to take down the rotator to fix a broken brake? 

I have had my tower up for 11 years (120 feet with a 21 ft mast) and have
only had the yagi turn on the mast during a major spring storm once and it
moved about 30 degrees.  Other than that I have been through two hurricanes
and one other big spring storm with no problems. I use a tower company so I
don't know how tight the guys get those mast to boom bolts. Maybe your mast
is made of some real hard alloy that is causing you to get "no bite">

Bill W5VX

-----Original Message-----
[] On Behalf Of Frank
Sent: Thursday, April 05, 2012 10:24 AM
Cc: KA9S - Jeff;
Subject: Re: [TowerTalk] HAM IV rotor / mast slipping wrote:

>The Tailtwister (big brother of the Ham IV) has a pre-drilled hole 
>through the upper rotor housing and clamp piece.
>I'd pin the mast with your rotor, just as is done with the T2X.

Pinning the mast to the rotator is a sure way of preventing mast slippage.
It also puts you at risk for rotor destruction if the wind load becomes
overly excessive.  Since there is no good way of predicting how strong the
wind is going to be here in Texas,  I have preferred not to pin the mast to
the rotor (anymore).

It is a PIA to have to re-align the directional calibration every so often,
but it is an even bigger PIA to replace the rotor after its gears get

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