[TowerTalk] New Tower installation

[Gene Fuller]

Hi Rex -

Another two cents worth -

A four foot shank sounds a bit short, even though installed at a 50 degree 
angle it still has to pull tthrough 4 feet of earth.  Remember that closer 
to the surface the soil is not as compact and would offer less resistance 
than deeper. If, including  some of the tower, the effective surface area 
would be at least 10 square feet, at 30 psf wind pressure you would have a 
300+ lbs horizontal force, which, translated down to a 50 degree guy angle 
would look more like 400-450 + lbs, again, perhaps a challenge for a 4 foot 
anchor rod only 3 feet deep - especially since 30 pfs may be on the light 
side and higher gusts, and a bit of pumping. I agree with Frank - 6 foot 
minimum.

Gene / W2LU

----- Original Message ----- 
From: <donovanf at starpower.net>
To: <towertalk at contesting.com>
Sent: Saturday, November 14, 2009 2:10 PM
Subject: Re: [TowerTalk] New Tower installation


Rex,

Four feet is unusually short for a guy anchor.  When you set that anchor in 
at an angle, as you must, it will be buried less than three feet below the 
surface.  An appropriate anchor should be at least six feet long.

73
Frank
W3LPL

---- Original message ----
>Date: Sat, 14 Nov 2009 13:52:20 -0500
>From: "Rex Lint" <rex at lint.mv.com>
>Subject: Re: [TowerTalk] New Tower installation
>To: <towertalk at contesting.com>
>Cc: "'Michael Ryan'" <mryan001 at tampabay.rr.com>
>
>
>DAVE,
>
>..."or do I need to angle them at 50 deg. as stated in the Rohn
>spec's."
>That should be taken as the answer... if it didn't make any difference, 
>they
>wouldn't specify it.  Don't forget LXC's maxim - do what the manufacturer
>says.
>
>I once climbed a tower where the guy rods were put in sticking STRAIGHT UP.
>I won't do THAT again - it wobbled like a noodle.
>
>      -Rex-
>
>     K1HI
> Rex Lint
>   Merrimack, NH
>
>
>-----Original Message-----
>From: towertalk-bounces at contesting.com
>[mailto:towertalk-bounces at contesting.com] On Behalf Of Michael Ryan
>Sent: Saturday, November 14, 2009 1:11 PM
>To: 'Dave'; towertalk at contesting.com
>Subject: Re: [TowerTalk] New Tower installation
>
>I would install at an angle, if not sooner or later they are going to want
>to lean in the direction of the tower at the angle they were supposed to be
>installed at in the first place. You will constantly be re-tightening your
>guy wires.  - Mike
>
>-----Original Message-----
>From: towertalk-bounces at contesting.com
>[mailto:towertalk-bounces at contesting.com] On Behalf Of Dave
>Sent: Saturday, November 14, 2009 1:01 PM
>To: towertalk at contesting.com
>Subject: [TowerTalk] New Tower installation
>
>I have just put up a Rohn 25G.  My question is, and I haven't researched 
>the
>archives due to the  interest of time before the snow blows. Can I use the
>3/4" x 4' screw anchors with 6" blade to secure the tower with out using
>cement.  If I just screw them in all the way straight down, no angle,  will
>they hold, or do I need to angle them at 50 deg. as stated in the Rohn
>spec's.
>I would like some feedback on this way of doing it.  These things are
>suppose to hold trailers down.  Are they reliable enough for the tower.
>Wind load on the only beam is 6.9 sq. ft. with a 10' 2" mast.
>
>Thanks, Dave
>_______________________________________________
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