[TowerTalk] Prop Pitch Rotors and water intrusion

[George Dubovsky]

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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>