The 25AG3 is my preferred pointy top that allows you to use a 2" OD mast.
It looks stronger to me than the 25AG2 which is the other Rohn pointy top
that allows a 2" OD mast.
Stan
w7ni@easystreet.com
----- Original Message -----
From: "Steve Katz" <stevek@jmr.com>
To: <n4kg@juno.com>; <TOWERTALK@contesting.com>
Sent: Thursday, December 05, 2002 7:49 AM
Subject: RE: [Towertalk] New Rotator In Place; Mast Now Binds
> Hi Tom,
>
> I didn't look, but presume you're right, as I've heard of people using
large
> masts with R25 "pointy top" sections. I just never saw one myself that
> would let a 2.00" OD mast rotate -- the ones I've used must have been
> exactly that dimension, so a 2" mast was an interference fit. -WB2WIK/6
>
> "If everything seems under control, you're just not going fast enough." -
> Mario Andretti
>
> > -----Original Message-----
> > From: n4kg@juno.com [SMTP:n4kg@juno.com]
> > Sent: Wednesday, December 04, 2002 7:58 AM
> > To: TOWERTALK@contesting.com
> > Subject: Re: [Towertalk] New Rotator In Place; Mast Now Binds
> >
> > Actually, Rohn manufactures 5 different types of "pointy top" sections
> > plus the "flat top" section. See the Rohn catalog for details,
including
> > the PIPE Diameter at the Top which range from 2.0 to 2.75 inches O.D.
> >
> > Tom N4KG
> >
> > On Tue, 3 Dec 2002 10:12:51 -0800 Steve Katz <stevek@jmr.com> writes:
> > > I'd replace the pointy-top section with a flat-top one and use a 2"
> > > thrust
> > > bearing. And also a 2" mast. Since you're in for thunderstorms and
> > > high
> > > winds, work done in such conditions will be perfect, and will last
> > > forever!
> > >
> > > But it does sound like you need to shim the mast-to-rotor interface
> > > to
> > > center up the rotating mast better. That's normal. The HAM series
> > > rotors
> > > only center the mast when the mast used is 2-1/6" diamenter, I
> > > believe, and
> > > anything smaller O.D. will rotate out of centricity, causing
> > > precisely the
> > > problem you have. The last pointy-top R25 section I owned (many
> > > years ago)
> > > would not even pass a 2" mast, let alone allow one to rotate.
> > >
> > > WB2WIK/6
> >
> >
> >
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