[TowerTalk] How far down should the rotor be located

[Tom Wagner]

Jerry --

Weight does not matter on most guyed towers.
Assuming we are talking Rohn 25, you could
have 5-6 more sets of guys.  Each one would
exert about 1000 lbs of downward force on the
tower.  With 5 sets, thats 5000 lbs.  100 lbs
of mast is insignificant.

The real question is how long a mast can you
handle at the top of the tower?

73,
Tom Wagner - N1MM
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----- Original Message -----
From: JerryC <jerryc@netscope.net>
To: <towertalk@contesting.com>
Sent: Sunday, May 20, 2001 14:02
Subject: [TowerTalk] How far down should the rotor be located


> I am almost ready to put up my little 40' guyed tower.  Everything is here
> or on the
> ups truck.  There is a lot of discussion on mast stress and material type
> but haven't
> seen anything on how far the rotor should be below the thrust bearing.   I
> am using 2" o.d.
> x 3/16" wall sae 1026 tuning.  It came from the steel supplier at 21'-6"
> long.  I am mounting
> a 4 el 10M vee (elements are up on 45 degrees on each side of boom)
circular
> polarized antenna
> 10' above the tower top.  The rotor is a Yaesu G800SA.  In the future I
will
> probable remove
> the 4el 10M vee and install a 3 el tri-bander about three feet up and put
a
> small vhf stack on top.
>
> How far down should the rotor be located in relation to the height of mast
> above the thrust bearing?
> I could use the whole mast but would rather minimize the weight.  I want
the
> rotor far enough down
> to minimize the side load on it.  Any suggestions??
> Thanks
> JerryC
> jerryc@netscope.net
> no call yet (still working on the code)
>
>
>
>
> List Sponsor:  Champion Radio Products - We'll be at the Dayton Hamvention
> with all of our safety equipment and other products. Stop by booth #559
and
> say hi.
> <A HREF="http://www.championradio.com">www.ChampionRadio.com</A>
>
> -----
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List Sponsor:  Champion Radio Products - We'll be at the Dayton Hamvention
with all of our safety equipment and other products. Stop by booth #559 and
say hi.
<A HREF="http://www.championradio.com">www.ChampionRadio.com</A>

-----
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