With our antennas the windload is always stated as force, unit Newton [N], relative to a defined windspeed.
The windload can be calculated from the antenna surface:
|F = q * A|
|with||F||Windload in N|
|q||Wind pressure in N/m² (see below)|
|A||Surface of antenna in m²|
Depending on expected windspeed the wind pressure is assumed as (according to EN 60728-11):
- q = 800N/m²: max. Windspeed 130km/h (Antenna less than 20m above ground)
- q = 1100N/m²: max. Windspeed 150km/h (Antenna more than 20m above ground)
- q = 1250N/m²: max. Windspeed 160km/h (on hills or at the coast)
When re-calculating the windload to a different windspeed please note that the wind pressure grows exponentially (squared) with the windspeed! Double windspeed meand 4 times the windload...
All calculations at your own risk...
Approximative formula for stacking distance of antennas:S = L / (2* sin(a/2))
S = Stacking distance
L = Wavelength
A = 3 dB angle of antenna