There has been a lot of speculation that the downward
forces on the base plate would prevent rotation about
a pier pin. I know of one example where I'm sure there
was enough torque to rotate about a pier pin.
N4AR has a pair of 200 ft R45 towers with the bottom
sections in concrete. One of these towers has a 4 high
stack of CC 4L20's. After a tornado passed by his QTH
he was cleaning up around the base of the tower when a
finger went down into a hole. The tower rotated enough
to SHEAR OFF all 3 legs!
de Tom N4KG
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