[TowerTalk] Yagi statcking order?

[sawyered at earthlink.net]

With 17ft of mast exposed, how much is in the tower?  I have always been one
to have close to half of the mast "in" the tower.  I have a 21 ft .025 inch
wall mast and 8 ft of it is in the tower - so 13 ft is above.  I have a 3 el
40M3L (32 ft boom) 10 ft above the tower with the last 3 ft for the boom
truss assembly.  I have a 4 element wide-spaced 10M yagi just above the
tower (24 ft boom).  I have never had anything of concern with this
arrangement.

 

I have a Thrust bearing at the top of the tower and the rotor (Yaesu 2800)
at the bottom of the mast.  I have a second thrust bearing mid section but I
let it float unless I am doing maintenance requiring pulling the rotor.

 

I think the moment arm of the mast vs what's pushing against it in the tower
is a big part of the question.

 

Ed  N1UR