[TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

[john at kk9a.com]

A long time ago I had a US Tower with a flange style bearing supplied 
with the tower and there were no fit issues, or any issues for that 
matter. Flange bearings are readily available in a lot of sizes under 
3".  Maybe a 2 3/16 of 55mm bearing would fit a 2" mast OK?  A 3" should 
work with a 2 7/8 mast.  Finding this style bearing for a 3" galvanized 
mast may be more of a challenge but I have not looked. I tried Rohn's 
bearing once too. The first one that I purchased did not turn brand new 
out of the box and the replacement started getting tight after six 
months of use in Aruba.


John KK9A

STEVE, NR4M wrote:

-------------------------

Jim,

How is the fit on the ID?

So, many of this type of bearing will not work due to the tight 
tolerances. A mast that's been galvanized usually will not fit.

73 de Steve, NR4M

Sent from my iPhone

> On Mar 11, 2019, at 8:23 AM, Jim <jimw7ry at gmail.com> wrote:
> 
> This is what I have used for 30 years. Same bearing on 4 different 
> towers in various locations. In Southwest Washington, we got 70" of 
> rain per year. Held up fine.
> 
> 
> https://www.ebay.com/itm/UCF211-32-2-Square-4-Bolt-Flange-Bearing/362153741170?hash=item54520b8b72:g:a2QAAOSwnTdaA6IQ
> 
> 
> I do put a cover over the top of it with a vent pipe roof jack (just 
> the rubber part) to keep water out.
> 
> 
> Thanks
> 73
> _ Jim W7RY_