ALMAC BiBi 850 HE, Use And Maintenance Manual

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4.1.2 Action of the wind
It is forbidden to use the machine if the wind speed exceeds 12.5 m/s.
The following chart describes the consequences of different wind speeds (Beaufort scale).
Scale of the Italian Hydrographic Service Beaufort International Scale Effects
N° Wind description Speed in km/h N° Wind description
Corresponding
speed
In km/h In m/sec
0
Calm
0-7
0
Perfect calm
1,08
3,60
0,3
1,0
Calm, smoke rises
vertically
1
Light air, bora
6,12
7,20
1,7
2,0
Wind direction shown by
smoke but not by wind
vanes
1
Light wind
7-14 2
Light breeze
11,16
14,40
3,1
4,0
Wind felt on face; leaves
rustle; vane moved by
wind
2
Moderate breeze
14-29
3
Light wind
17,28
21,60
4,8
6,0
Leaves and small twigs in
constant motion. Wind
extends flags.
4
Moderate breeze
24,12
28,80
6,7
8,0
Wind raises dust and
leaves. Branches are
moved.
3
Almost strong breeze
29-36 5
Fresh breeze
31,68
36,00
8,8
10,0
Small bushes begin to
sway. Waves form with
white foam crests.
4
Strong breeze
36-50
6
Strong breeze
38,52
43,20
10,7
12,0
Large branches in motion.
7
Near gale
46,44
50,40
12,9
14,0
Whole trees in motion.
5
Gale
50-83
8
Gale
55,44
61,20
15,4
17,0
Wind breaks branches off
trees; difficulty in walking
against the wind.
9
Strong gale
64,80
72,00
18,0
20,0
Structural damage
(chimney-pots and slates
removed)
10
Storm
75,60
82,80
21,0
23,0
Trees uprooted. Serious
structural damage.
6
Hurricane
83-108 11
Violent storm
86,40
108,00
24,0
30,0
Widespread damage.
Not classified
12
Hurricane
144,0
180,0
40,0
50,0
Countryside is devastated