CASIE
DESERT SEARCHES: THE EFFECTIVENESS OF HELICOPTERS

In Table 6, the column on the left is the cumulative POD desired for cloudy, subdued light conditions, and the row across the top is the confidence level required. The body of the tables consists of squares which contain two numbers, one of which is in parentheses. The number which is not in parentheses is the number of helicopter passes over the search area needed to achieve a cumulative POD of at least the value given in the column at the left. The number in parentheses is the factor by which the total area (in square miles) is multiplied in order to yield the number of helicopter hours needed to produce such a cumulative POD.

TABLE 6
Number of Helicopter Passes and Helicopter Hours Required to Achieve Given POD for CLOUDY, SUBDUED LIGHT CONDITIONS
Confidence Level

 

0.400

0.500

0.600

0.700

0.750

0.800

0.850

0.900

0.950

0.990

0.999

For POD of at least

 

 

 

 

 

 

 

 

 

 

 

0.5

1

1

1

1

1

2

2

2

2

2

3

 

(0.1)

(0.1)

(0.1)

(0.1)

(0.1)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.3)

 

 

 

 

 

 

 

 

 

 

 

 

0.6

2

2

2

2

2

2

2

2

2

3

3

 

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.3)

(0.3)

 

 

 

 

 

 

 

 

 

 

 

 

0.7

2

2

2

2

2

2

2

3

3

3

4

 

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.3)

(0.3)

(0.3)

(0.4)

 

 

 

 

 

 

 

 

 

 

 

 

0.75

2

2

2

2

2

3

3

3

3

4

5

 

(0.2)

(0.2)

(0.2)

(0.2)

(0.2)

(0.3)

(0.3)

(0.3)

(0.3)

(0.4)

(0.6)

 

 

 

 

 

 

 

 

 

 

 

 

0.8

2

2

3

3

3

3

3

3

4

4

6

 

(0.2)

(0.2)

(0.3)

(0.3)

(0.3)

(0.3)

(0.3)

(0.3)

(0.4)

(0.4)

(0.7)

 

 

 

 

 

 

 

 

 

 

 

 

0.85

3

3

3

3

3

3

3

4

4

5

7

 

(0.3)

(0.3)

(0.3)

(0.3)

(0.3)

(0.3)

(0.3)

(0.4)

(0.4)

(0.6)

(0.8)

 

 

 

 

 

 

 

 

 

 

 

 

0.9

3

3

3

4

4

4

4

4

5

6

8

 

(0.3)

(0.3)

(0.3)

(0.4)

(0.4)

(0.4)

(0.4)

(0.4)

(0.6)

(0.7)

(0.9)

 

 

 

 

 

 

 

 

 

 

 

 

0.95

4

4

4

5

5

5

5

5

6

8

10

 

(0.4)

(0.4)

(0.4)

(0.6)

(0.6)

(0.6)

(0.6)

(0.6)

(0.7)

(0.9)

(1.1)

 

 

 

 

 

 

 

 

 

 

 

 

0.99

6

6

6

7

7

7

8

8

9

12

15

 

(0.7)

(0.7)

(0.7)

(0.8)

(0.8)

(0.8)

(0.9)

(0.9)

(1.0)

(1.3)

(1.7)

 

 

 

 

 

 

 

 

 

 

 

 

0.999

8

9

9

10

10

11

11

12

13

17

23

 

(0.9)

(1.0)

(1.0)

(1.1)

(1.1)

(1.2)

(1.2)

(1.3)

(1.4)

(1.9)

(2.6)