[TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

[Jim]

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

On 3/10/2019 10:32 PM, Tim Duffy wrote:
> Best bearing - can take lots of weight.
>
> https://www.dxengineering.com/parts/dxe-tb-300
>
> Very different from the Rohn
>
> 73
> Tim K3LR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of
> Patrick
> Sent: Sunday, March 10, 2019 12:20 PM
> To: towertalk at 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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