For what it may be worth, I suspect that DX Engineering's calculator is
pretty conservative. It says my setup won't pass at 100 mph, and that
my OB2-40 alone (no OB-16-3 at all) at thirteen feet just barely does.
Dave AB7E
On 10/8/2018 12:45 PM, David Gilbert wrote:
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
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