[TowerTalk] Mast length in and out of tower

[David Gilbert]

I have a mast identical to yours in every respect, although mine was 
purchased elsewhere.  I have 5 feet inside the tower and the remainder 
above, with an Optibeam OB16-3 three feet above the tower and an 
Optibeam OB2-40 thirteen feet above the tower.  That's not a huge amount 
of wind area, but I get HORRENDOUS wind gusts here on my southern 
Arizona hillside lot, and most days during the spring they run anywhere 
from 60 mph to 100 mph (literally) every five minutes all day long for 
months on end.  The mast and antennas have been up there for ten years 
now and the mast still looks great.

There are formulas out there that would give you an exact answer ... 
it's just a matter of the mast specs, leverage, and whatever wind load 
you plan to put on it.  DX Engineering's own website has this 
calculator.  https://www.dxengineering.com/mastloadestimator

73,
Dave   AB7E



On 10/8/2018 11:45 AM, Chris Hoelzle wrote:
> I bought one of the DX Engineering super heavy duty 2" Masts. It is 22 feet
> long.
>
> My question is: How many feet inside the tower and how many feet above?
>
> My initial thoughts were to have 8 feet inside the tower going to an Orion
> M2800 Rotor and then 14 feet up out of the tower.
>
> Is there any set formula?
>
> Thanks
>