Tell that to a glacier.
Carl
KM1H
----- Original Message -----
From: "David Robbins K1TTT" <k1ttt@arrl.net>
To: <TOWERTALK@contesting.com>
Sent: Sunday, July 15, 2007 5:58 AM
Subject: Re: [TowerTalk] new tower
> Personally I would want to see the video of the steel base on the concrete
> with the thousands of pounds of pressure from the tower and guys on it
> grating past each other before I would believe that it was for relieving
> stress from torque.
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://www.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
>
>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com [mailto:towertalk-
>> bounces@contesting.com] On Behalf Of john@kk9a.com
>> Sent: Sunday, July 15, 2007 02:39
>> To: jeremy-ca; TOWERTALK@contesting.com
>> Subject: Re: [TowerTalk] new tower
>>
>> I guess you are saying that the base will rotate before the tower breaks.
>> I
>> don't think that much torque makes it to the base on a tall tower.
>> Certainly the pier pin base will not prevent your tower from moving at
>> the
>> top. I never saw any movement at the base of my 160' Rohn 65G tower
>> loaded
>> with large antennas, however the tower definitely twisted at the top
>> before
>> I added a 6 way star guy.
>>
>> KK9A
>>
>>
>> ----- Original Message -----
>> From: "jeremy-ca" <km1h@jeremy.mv.com>
>> To: <john@kk9a.com>; <TOWERTALK@contesting.com>
>> Sent: Saturday, July 14, 2007 10:33 AM
>> Subject: Re: [TowerTalk] new tower
>>
>>
>> The tower will still move but it is not twisting as in winding up to a
>> point
>> of possible fracture. The commercial site over on the next hill had 140'
>> of
>> 45G with the base buried in concrete and a bunch of sticks on it. After
>> about 15 years the bottom section fractured. The tower didnt collapse but
>> they replaced it with 55G on the same pad but drilled it for a pin.
>>
>> We are both in a very exposed location with negative horizons and once
>> above
>> the tree line the wind is almost always fairly strong even when it is
>> dead
>> calm on the ground.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message -----
>> From: <john@kk9a.com>
>> To: <TOWERTALK@contesting.com>
>> Cc: <km1h@jeremy.mv.com>
>> Sent: Friday, July 13, 2007 10:57 PM
>> Subject: Re: [TowerTalk] new tower
>>
>>
>> >I agree that the pier pin lets the guys do the work and it is the best
>> base
>> > for large tower. I don't think the pier pin base will do anything to
>> > minimize tower twisting. The best way to stop the twisting is to use a
>> > star
>> > guy bracket.
>> >
>> > John KK9A
>> >
>> >
>> >
>> > To: "Mark Robinson" <markrob@mindspring.com>,"Paul Hemby"
>> > <phemby@hotmail.com>, <towertalk@contesting.com>
>> > Subject: Re: [TowerTalk] new tower
>> > From: "jeremy-ca" <km1h@jeremy.mv.com>
>> > Date: Fri, 13 Jul 2007 21:34:21 -0400
>> > List-post: <mailto:towertalk@contesting.com>
>> >
>> > It minimizes the tower twisting forces especially at the base.
>> Recommended
>> > by Rohn. Especially advantageous with a tall tower with a big load;
>> > lets
>> > the
>> > guys do the work. Ive been on the top of my tower with a strong wind
>> > blowing
>> > and with the 1/4" EHS it barely moves.
>> >
>> > Carl
>> > KM1H
>> >
>> >
>>
>> _______________________________________________
>>
>>
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