To Next Page

To Previous Page

NATIONAL CRANE Published 11-01-2020 Control # 710-00 2-11

NBT60XL OPERATOR MANUAL SAFETY PRECAUTIONS

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

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

Reference

Only

Manitowoc NBT60XL User Manual

Questions and Answers: