[TowerTalk] Rotor replacement

[W3YY]

Barry -

Perhaps it is too late for this now, but in the future if you install two
thrust bearings to support and align the mast, your rotator will have no
vertical load on it and you can remove and replace rotators without any
problems or special effort.

73, Bob - W3YY


----- Original Message ----- 
From: "Barry " <w2up at mindspring.com>
To: <Towertalk at contesting.com>
Sent: Monday, December 01, 2003 6:24 PM
Subject: [TowerTalk] Rotor replacement


> Hi all,
> My Tailtwister has been acting up a bit (not bad for 13 years in
> service) and I want to replace it with a spare I have.  It is mounted
> down about 8 ft from the top flat plate (with a TB-3 bearing) in a
> Rohn 45.  The mast is about 20 ft long with a TH7 up 6 inches and a
> 40-2CD at the top, about 9 ft above the TH7.
>
> I want to make this as simple as possible, so have thought of the
> following procedure:
> If I simply remove the rotor from the plate, without doing anything
> with the antennas or mast, the mast will lean until it hits a horiz.
> strut on the a wall, which is a max. of 7.25 inches from center.
> With 8 ft of mast below the TB-3, this amounts to a 4.3 degree
> deflection (if my math is correct).
>
> Questions:
> 1. Is there enough play in the TB-3 where this 4.3 degree out-of-
> vertical is not a problem with respect to the bearing?
> 2. Assuming the lean is OK,  is there enough clearance between the
> mast and diagonal struts to slip the rotor out (and the new one in)
> between them without removing anything else, such as the rotor plate?
>
> Any other thoughts or ideas to make this as simple as possible for a
> one-man job, without jacking up the mast, etc?
>
> Tnx,
> Barry W2UP--
> Barry Kutner, W2UP              Internet: w2up at mindspring.com
> Newtown, PA                     Frankford Radio Club
>
>
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