NATIONAL CRANE
Published 03-23-2018 Control # 243-14
2-11
NBT50 OPERATOR MANUAL
SAFETY PRECAUTIONS
2
Calculation of Projected Wind Area (Ap)
:
Determining Wind Drag Coefficient (Cd)
Table 2-2 shows the typical Shapes and corresponding Wind
Drag Coefficient
(
Cd
)
values.
If the exact Wind Drag Coefficient of a shape is not known,
use the maximum value of the shape’s range
(Table 2-2).
If the wind drag coefficient of the load cannot be estimated or
determined, it shall be assumed that
(
Cd
) =
2.4
.
A
p
= 24 m
2
A
p
= 8 m
2
Wind
Wind
8 m
1 m
3 m
8 m
1 m
3 m
A
p
= 250 ft
2
A
p
= 75 ft
2
Wind
Wind
25 ft
3 ft
10 ft
25 ft
3 ft
10 ft
8384-1
FIGURE 2-2
Summary of Contents for National Crane NBT50 Series
Page 1: ...Operator Manual National Crane NBT50 Series ...
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Page 10: ...TOC 6 TABLE OF CONTENTS OPERATOR MANUAL NBT50 THIS PAGE BLANK ...
Page 12: ...INTRODUCTION OPERATOR MANUAL NBT50 1 2 Published 03 23 2018 Control 243 14 FIGURE 1 1 7650 66 ...
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