Manitowoc National Crane NBT40-1 Series User Manual

National Crane 3-29-2018 Control # 610-00 2-11
NBT40-1 SERIES OPERATOR MANUAL SAFETY INFORMATION
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)-Non-metric
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

Manitowoc National Crane NBT40-1 Series Specifications

General

Brand	Manitowoc
Model	National Crane NBT40-1 Series
Category	Construction Equipment
Language	English