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Masts and stacking considerations

To: <>
Subject: Masts and stacking considerations
From: (Stan Griffiths)
Date: Sat, 15 Jun 1996 02:03:41 -0700 (PDT)
>Adam  AA7FT said:
>> When I used to use 3" mast, I reduced it to 2" from below the  thrust
>> bearing (mondo!) to the
>> rotator.  This can be done by looking at pipe tables for id and od's.  No
>> bending strength
>> is needed below the thrust bearing, so the 2" is OK.
>I only know what I've been told by Dick, K5IU. The force on the mast 
>above the bearing is transferred to the mast below the bearing. So in
>your case the 2" pipe may bend when a strong enough force is applied
>to the 3" mast.
>Kris AA5UO

It makes a huge difference WHERE the change from 3 inch to 2 inch mast
material takes place.  If you stay with 3 inch mast for a couple of feet
below the bearing and then taper to 2 inch, that is FAR better than going to
2 inch immediately below the bearing.


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