[TowerTalk] Mast length in and out of tower

[David Gilbert]

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
>>
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk