VXB Bearings sells a 2 1/16" dia bore flanged bearing....it's the only
one at that size I have found so far.....should work with a 2"
galvanized mast.
One might need to file down some high spots of the galvanized coating,
because when the masts are pulled out of the tank the end that is down
collects more material...
We have had to do that many times......it's not a big deal......a flat
file & vernier calipers gets the thing right to fit thru a bearing.
https://www.vxb.com/2-1-16-Inch-HCF211-33-Flanged-Eccentric-Collar-p/hcf211-33.htm
Regarding the K4GMH prop pitch situation......he cannot put any vertical
load on his prop pitch because he does not have the top plate & bearing
that support the bevel gear/mast connection, or whatever he has
imagineered....which could handle the axial load (around 1000 lbs). He
has other issues to deal with, like how to seal the top end of the unit
to keep water out of it. That is what ruins most of the prop pitch units
put in service by amateurs!
73, Kurt, K7NV
P.S. We are still here doing what We do....something like starting to
build our 330-335th ones....., but it is hard to stay up with my
assistant, Marco, because I have some much larger fish to fry......
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Patrick
Sent: Sunday, March 10, 2019 12:20 PM
To:towertalk@contesting.com
Subject: Re: [TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor
I'd double check the need for a down thrust bearing to relieve the
weight from the PP unit. Kurt Andress the preeminent PP re-purpose guru
advised me against it.
Patrick NJ5G
On 3/10/2019 10:16 AM, Mike wrote:
Hello,
What have others used to take the weight off of a tower mounted prop pitch
rotor?
Presently, in the final stage of modifying a rescued prop pitch and,
unfortunately, it didn't have the triangle bearing plate. Plan to use a
couple of Rohn TB3 thrust bearings, one at top of the tower and the other
approx. 2 ft below the top, but wanted to find out what others
successfully
have used to keep the weight off prop pitch rotors.
The load will consist of a 2" dia. X 1/4" wall X 21 ft chrome molly mast
plus a homemade 40 m Moxon (approx. 70 lbs) and a 4 el SteppIR (approx. 50
lbs).
I've review the TT archive for thrust bearings for possible application
with a prop pitch rotor without any consensus on what to use other than
the
available thrust bearings are not reliable in the long run.
73,
Mike, K4GMH
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