Manitowoc Grove RT770E Operator's Manual page 26

SAFETY INFORMATION
This 3-second wind gust is assumed to act on the entire
crane and the load. The wind effect on the load can be
conservatively estimated as:
a) If V(z) is ≤ 13.4 m/s (30 mph), then the allowable
load is the published rated capacity from the Load Chart.
b) If V(z) is > 13.4 m/s (30 mph) and is ≤ 20.1 m/s
(45 mph), the allowable load is the published rated
capacity multiplied by the Capacity Reduction Factor
from Table 2-4 (metric) or (non-metric).
2-8
NOTE:
c) If V(z) is > 20.1 m/s (45 mph), then lifting is NOT
permitted. Cease lifting operations and lower and retract
the boom.
In both cases a) and b) above, the lift may also be limited by
the projected wind area of the load Ap and by the wind drag
coefficient Cd: This limit can be determined by comparing
the Actual wind resistance area with the Allowable wind
resistance area.
Refer to Figure 2-2 for a simplified calculation method to
determine permissible wind speed.
Published 04-04-2017, Control # 446-09
RT770E OPERATOR MANUAL
This condition is limited to operation with the main
boom on fully extended outriggers only.