[TowerTalk] base section

[W7XU Arliss]

Re: fixed base vs. pier pin -- at least for Rotating Tower Systems,
when K5IU was the owner I believe the "prime directive" was no pier
pins.

73,  Arliss  W7XU

K7LXC@aol.com wrote:
> 
> In a message dated 11/30/00 6:08:28 AM Pacific Standard Time, k1my@nlis.net
> writes:
> 
> > I understand that for a fixed tower (rotating or stationary antennas) that
> >  a pier pin is the strongest solution; but what about a rotating tower? Is
> >  it a logical conclusion that the best way to go is with a buried section
> >  because of the potential rotational moment?
> 
>     Where's your bottom bearing going to be? Is it going to go on a section?
> 
>     If your question is whether the bottom (non-rotating) part of the tower
> should be a pier pin or buried section, I don't know if it makes much
> difference. I think the best scenario is to have the bottom bearing just
> above a set of guys; that way there's not much rotational torque below the
> bearing. A big rotating tower generates a lot of torsion on the tower as it
> winds up to start and coasts to a stop.
> 
>     If it was my tower, I'd go for a buried section - I don't like messing
> with a pier pin and temporary guys.
> 
> Cheers,    Steve    K7LXC
> Tower Tech
>

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