Towertalk
[Top] [All Lists]

Re: [TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor

To: "towertalk@contesting.com" <towertalk@contesting.com>
Subject: Re: [TowerTalk] Thrust Bearing for Use with Prop Pitch Rotor
From: Robert Harmon <k6uj@pacbell.net>
Date: Mon, 11 Mar 2019 08:06:46 -0700
List-post: <mailto:towertalk@contesting.com>
Jim,

I am using the same bearing.  For years I used the Rohn TB-3.  I like the fact 
that it has a zerk fitting and I can grease it.  I also use a rubber cone from 
a vent pipe over it.  Great minds think alike :-).  


Bob
K6UJ





> On Mar 11, 2019, at 5:23 AM, Jim <jimw7ry@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
> 
> 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@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
>>> _______________________________________________
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> TowerTalk mailing list
>>> TowerTalk@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>> 
>>> ---
>>> This email has been checked for viruses by AVG.
>>> https://www.avg.com
>>> 
>>> 
>> _______________________________________________
>> 
>> 
>> 
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
>> 
>> _______________________________________________
>> 
>> 
>> 
>> _______________________________________________
>> TowerTalk mailing list
>> TowerTalk@contesting.com
>> http://lists.contesting.com/mailman/listinfo/towertalk
> 
> _______________________________________________
> 
> 
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

<Prev in Thread] Current Thread [Next in Thread>