[TowerTalk] Tailtwister inside Rohn 25?

[Jim W7RY]

Yes. It will fit. BUT....   You either need to put it inside of the tower 
when your building it, and/or cut one of the horizontal braces to get it in 
and out. If you put it at a joint, you don't really need that brace because 
there is one directly above it or below it.

I had one at 110' in Spokane. It was turning a TH6 and a Hy-Gain shorty 40 @ 
125 feet. Never thought twice about cutting the cross piece.

73
Jim W7RY


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From: "KA9S2 - Jeff" <ka9s2 at comcast.net>
Sent: Sunday, January 29, 2012 1:00 PM
To: <towertalk at contesting.com>
Subject: [TowerTalk] Tailtwister inside Rohn 25?

> I am contemplating putting a Tailtwister rotor (T2X) into my 70 foot
> Rohn 25 tower (well guyed). My primary question is will a Tailtwister
> fit or how do you make it fit in a Rohn 25 tower? I currently have a HAM
> IV rotor in the tower. I have a thrust bearing at the top of the tower
> that takes all the vertical weight of the antenna and mast. The rotor is
> placed at the tower section junction 10 feet down from the top. The
> rotor plate sits upside down and rests on the top horizontal rung of the
> 60 foot tower section. I cut out one of the bottom horizontal rungs of
> the 70 foot tower section, threaded it and put long nuts onto each end.
> This allows me to remove the rung to fish the HAM IV out of the tower
> for repair but not loose the horizontal rung.
>
> I can't find dimensional drawings of the Tailtwister on the web. I know
> the six "nubs" around the perimeter of the rotor bell that hold the
> upper and lower bell halves together make the Tailtwister much wider
> than the HAM IV. Do these "nubs" clear the tower legs? Do they hit the Z
> cross bracing? Is there some critical positioning needed for the "Nubs"
> to clear the Z cross bracing? Currently, my HAM IV is short enough that
> the widest point of the rotor bell is still below the first horizontal
> rung of the 70 toot section so there is no issue. I am not sure this
> will be the case with a Tailtwister. I assume the Tailtwister is taller
> than the HAM IV thus requiring the mast be raised by some amount.
> Without a dimensional drawing of the rotor, I can't work these questions
> out. The manual for the Tailtwister shows six bolt holes on the bottom
> though I don't see rotor plates with the six holes. Does the rotor use
> six bolts on the base?
>
> Please help me out if you know.
>
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