Yaesu show a mast bearing - mount to the mast above the rotator and
guy - but with your relatively small load I don't see a need for it.
Look at the loads K7NV had on his AB-577(s) with no bearing above the
rotator. His TH7 represents significantly more load that you are
proposing.
73,
... Joe, W4TV
On 7/18/2023 9:41 AM, Pete Smith N4ZR wrote:
I have a C-3E tribander on an AB-577 "rocket launcher." I also have a
3-element 6-meter yagi that I was planning to mount 6 feet above the
Yaesu rotator at the top of the 577, but was deterred by concern of some
knowledgeable hams that this might overload the rotator and cause a
catastrophic failure, destroying the rotator and the tribander. That's
just too big a risk for me.
It occurs to me to wonder whether someone out there has contrived a way
to mount a thrust bearing above the rotator on an AB-577? I can
visualize what this might look like, involving a structure attached to
the top of the top-most tube below the rotator and supporting a thrust
bearing a foot or so above, but don't want to reinvent the wheel unless
necessary.
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