[TowerTalk] Rohn 25 stub tops

[Blake M.]

----- Original Message ----- 
From: "K4SB" <k4sb at bellsouth.net>
To: <towertalk at contesting.com>
Sent: Sunday, June 05, 2005 12:08 PM
Subject: Re: [TowerTalk] Rohn 25 stub tops


> Rohn, or someone else also made a top for 25 which was flat on the
> top, and only about 12 or so inches long. Designed to be used with a
> thrust bearing.

One thing to remember about with the little 25G flat top, though, is that 
the rotor can only be placed either 1' down from the top or at the next 
lower joint.  For a "normal" mast (10-15') this limits your options.

To address this, I made my own "flat top" with the bottom half of a 25G 
section.  I cut one of the last (bottom) diagonal cross braces out of a ~4' 
section, put a rotor plate beneath the last horizontal brace (near where the 
sections join) and one at the top, where it was cut, for a TB3.  I attached 
my guy bracket to the top section just below the rotor plate to help dampen 
top twist.

My logic was having 4' of a 15' mast inside a tower section (even with a cut 
brace) would be better than having 1' of a 15' mast inside the tower with no 
cut brace....?

73,
Blake N4GI
----- Original Message ----- 
From: "K4SB" <k4sb at bellsouth.net>
To: <towertalk at contesting.com>
Sent: Sunday, June 05, 2005 12:08 PM
Subject: Re: [TowerTalk] Rohn 25 stub tops


> Rohn, or someone else also made a top for 25 which was flat on the
> top, and only about 12 or so inches long. Designed to be used with a
> thrust bearing.



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