Here's what I could find. Fred Mott, AB8AH
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Re: [TowerTalk] Ham IV Rotor
from [Brad Pioveson] [Permanent Link][Original]
To: "Tim G. Boerresen" <tim@sunsite.lv>, <towertalk@contesting.com>
Subject: Re: [TowerTalk] Ham IV Rotor
From: "Brad Pioveson" <w9fx@verizon.net>
Reply-to: Brad Pioveson <w9fx@verizon.net>
Date: Fri, 21 Oct 2005 13:00:02 -0500
List-post: <mailto:towertalk@contesting.com>
Tim, in the old Ham II rotor manual, CDE stated the following:
"With 98 ball bearings operating in accurately machined races, the rotor is
capable of handling as much as a thousand pounds of downward pressure in
line with the axis of rotation." This rating refers to balanced weight,
and, the importance of keeping the weight ". . .in line with the axis of
rotation. . ." cannot be understated. The Ham IV's castings (upper and
lower) have been beefed up a bit since that was written about the Ham II
series, so, I'd think that this rating is still applicable, if a bit on the
conservative side.
Additionally, the same manual strongly discusses the benefits of mounting
the rotor on a flat plate (vs mast mounting), and, stresses the use of a
thrust bearing. Failure to do so seriously derates the rotor's ability to
do it's job (and, survive).
Hope this helps.
73,
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