[TowerTalk] mast strength

[Gregg Seidl]

I'm considering stacking a Cushcraft XM-240 and 10 feet below that per 
Cushcrafts recommendations an X-7.I want to make sure that I get a 
strongenough mast so it doesn't go horizontal on me.The windload @ 80 MPH 
is142 pounds for the XM-240 times 10 feet is 1420 plus 202 for the X-7 comes 
to 1622 pounds of bending force.Is this right?I see masts being rated at 
87,000,what does that mean,it takes 87 kpounds to bend it???Doesn't seem 
right.Thats a LOT of force,thats like driving our big John Deere on it and 
it wouldn't bend until the 4 foot level       20000 pound tractor times 4 
equals 80000.......I think I'm missing something here.    Gregg  K9KL