[TowerTalk] Tower loading... again...

Thu Apr 7 00:46:44 EDT 2005

"Would this tower handle a 2EL 80 meter beam at
the top (134')? "

I had a modified (by me, 65ft long boom and more overhead trussing) KLM 3E
75M yagi on top of 110 ft of Rohn 45 for 8 years.  This array went through
TWO hurricanes, one of them Gloria, in the 80's, produced winds here on top
of the hill I live on over 100 MPH.  The second, Bob, hit me with over 90
MPH winds on the backside of the eye that went overhead.  I saw the tower
twist up to 90 degrees at the top relative to the base during these
hurricanes. Everything stayed up and I had one pine tree fall on a lower set
of guys!  I took the antenna down about 10 years ago for a rebuild and never
put it back up.

Yup...you CAN overload Rohn 45 a bit.

Chuck...K1KW

----- Original Message ----- 
From: "StellarCAT" <RXDesign at ssvecnet.com>
To: <towertalk at contesting.com>
Sent: Thursday, April 07, 2005 12:23 AM
Subject: [TowerTalk] Tower loading... again...

> I am sure this has been covered many times over... if there is an article
or three please let me know the url...
> meanwhile:
>
> I have read many times over how people REALLY seriously overload their
towers - stacks on R25, HUGE
>  arrays on R45... is it indeed that the designs are THAT conservative!?
>
> I am in SE Arizona - near the city of Sierra Vista. I want to put up ~134'
of R45 - with a RTS rotor at ~37', an
>  RTS guy ring at 77' and 117' and the top of the tower (still R45) at
about 134'. I was thinking of a stack of M2
> 4EL 20's (35' boom) at 118 and about 78'. But I love 75/80. Would this
tower handle a 2EL 80 meter beam at
> the top (134')?
>
> I was thinking of the Force12 280S (58' elements, 18' "T" bars and a 36'
boom) or maybe even the
> 280Magnum (76' elements, 26' T-bars and a 44' boom)...
>
> [also - I have not tried to contact F12 - yet - I have however read they
may be in "trouble"? Calls going
> unreturned, product not being delivered... I would not want to promote
rumors but are they still healthy?]
>
> g.
> K9RX
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
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>