Re: [TowerTalk] Prop Pitch Rotors and water intrusion

[Jim W7RY <jimw7ry@gmail.com>]

Attachments are not allowed on this list.
That is ONE reason that I started towertalk@groups.io.


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@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@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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--
Thanks and 73, Jim W7RY

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