Masts and stacking considerations

[Kris Mraz AA5UO]

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.


-- 

73
Kris AA5UO
mraz@aud.alcatel.com