[TowerTalk] Prop Pitch Rotors and water intrusion

[Jim W7RY]

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73, Jim W7RY



On 1/16/2024 11:50 AM, George Dubovsky wrote:
> This is one of the two PP plates I made. One PP rotates a conventional mast
> on a tall R45, the other rotates a 105' rotating tower. In both cases, all
> axial force is resisted by a tower bearing; this plate only has to deal
> with torque.
>
> 73,
> geo - n4ua
>
> On Tue, Jan 16, 2024 at 11:27 AM George Dubovsky <n4ua.va at gmail.com> wrote:
>
>> Tom,
>>
>> I have two PP in service, both on Rohn 45. For both, I fabricated a custom
>> rotator plate from 1/2" aluminum plate and pressed in a new seal that fits
>> the OD of the PP output shaft. I used a Chicago Rawhide (don't know what
>> their new name is) CR 33458 seal. Both PP are still working (for over 20
>> years), so I haven't had the opportunity to look inside to see if there has
>> been any water ingress. Also, both PP have a water shield mounted on the
>> mast above, fabricated out of PVC plumbing pipe stuff.
>>
>> 73,
>>
>> geo - n4ua
>>
>> On Tue, Jan 16, 2024 at 10:26 AM Tom Hellem <tom.hellem at gmail.com> wrote:
>>
>>> In the case of a prop pitch rotor mounted underneath a rotor shelf in a
>>> tower, does anybody here have experience regarding the effectiveness of
>>> the
>>> rubber seal included in the
>>> prop pitch ? Does it do a good job of keeping out water, or is it
>>> problematic? The environment I am going to use one in is western Oregon,
>>> where it rains for 4 months almost non-stop, with wind as well.
>>> Any input appreciated.
>>>
>>> Tom Hellem
>>> K0SN
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>>>
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-- 
Thanks and 73, Jim W7RY