KLING & FREITAG K&F SEQUENZA 10 W - Manual (Page 14)

User's manual K&F SEQUENZA 10 N/W/B & Flying Frame
KLING & FREITAG GMBH © 2014 Version Version 6.1 Page 14 of 70
6.3 Wind Loading
For open air events, obtain current local wind and weather data. The following chart
provides a preliminary indication
Bft m/s Windspeed Description
0 0-0.2 Calm Smoke rises
vertically
1 0.3-1.5 Light air Smoke drift
indicates wind
direction, vanes
do not move
2 1.6-3.3 Light Wind felt on face,
vanes begin to
move
3 3.4-5.4 Gentle Leaves, small
twigs in constant
motion, light flags
extended
4 5.5-7.9 Moderate Dust, leaves, and
loose paper raised
up, small branches
move
5 8.0-10.7 Fresh Small trees in leaf
begin to sway,
whitecaps on lakes
visible
6 10.8-13.8 Strong Larger branches
of trees in motion;
whistling heard in
wires
7 13.9-17.1 Near gale Whole trees in
motion; resistance
felt in walking
against wind
8 17.2-20.7 Gale Twigs and small
branches broken
off trees
Warning
For outdoor uses, we recommend using at least a BGV D8+ hoisting device to avoid wind
causing the release of the secondary safety device.
If wind speeds higher than Beaufort 5 are expected, you must constantly consider the wind
speed and its possible influence on the array as well as the fact that the wind speed increases
the higher the array is.
With expected wind speeds exceeding Beaufort 5, construct the rigging and safety points so
that they can carry at least twice the static load.
With wind speeds exceeding Beaufort 6 (14 m/sec.), arrays are not recommended.
As of a wind speed of Beaufort 6, you must clear the area under the speakers. Effectively
prevent the arrays from swaying in the wind by tying them off or using a lateral fixation.
If the suspended load sways, it can create significant inertial force that can result in the PA
tower structurally collapsing or tipping.