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NATIONAL CRANE
Published 11-01-2020 Control # 710-00
2-11
NBT60XL OPERATOR MANUAL
SAFETY PRECAUTIONS
2
Table 2-2 Wind Drag Coefficient
Maximum Permissible Wind Speed
If the wind resistant area of the load
Awr
(load)
is greater than
the allowable wind resistant area
Awr
(allow)
, the ratio can be
used to determine a permissible wind speed
V(z)
for the load
using Table 2-3.
Table 2-3
Awr
Ratio and Permissible Wind Speed
V(z) - Imperial units
8384-2
Shape
Cd
1.1 to 2.0
0.3 to 0.4
0.6 to 1.0
0.8 to 1.2
0.2 to 0.3
0.05 to 0.1
Approximately 1.6
Turbine Blade or
Complete Rotor
Note: Permissible and rated wind speeds in this table are the 3-second gust wind speeds at boom tip height.
Ratio:
1.2
1.4
1.6
1.8
2
Maximum Permissible Wind Speed (mph)
For Rated Capacity at 30 mph
27.4
25.4
23.7
22.4
21.2
For Allowable Capacity at 45 mph
41.1
38.0
35.6
33.5
31.8
Fo
r
Reference
Only
Содержание NBT60XL
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