Table for Figure 11: Beam center heights (in kft) for selected elevation angles and ranges, up to 70,000 ft.

Range
Elevation
Angle (°)
10 nm
(18.5 km)
20 nm
(37 km)
30 nm
(55.5 km)
40 nm
(74.1 km)
50 nm
(92.7 km)
60 nm
(111.2 km)
70 nm
(129.7 km)
80 nm
(148.3 km)
90 nm
(166.8 km)
100 nm
(185.3 km)
110 nm
(203.9 km)
120 nm
(222.4 km)
0.0
0.066
0.027
0.60
1.06
1.67
2.39
3.25
4.24
5.37
6.63
8.02
9.54
0.5
0.600
1.33
2.19
3.18
4.31
5.57
6.96
8.48
10.1
11.9
13.9
15.9
1.0
1.13
2.39
3.78
5.30
6.96
8.75
10.7
12.7
14.9
17.2
19.7
22.3
1.5
1.66
3.45
5.37
7.42
9.6
11.9
14.4
17.0
19.7
22.5
25.5
28.6
2.0
2.19
4.51
6.96
9.54
12.3
15.1
18.1
21.2
24.4
27.8
31.3
35.0
2.5
2.72
5.57
8.55
11.7
14.9
18.3
21.8
25.4
29.2
33.1
37.2
41.3
3.0
3.25
6.62
10.1
13.8
17.6
21.5
25.5
29.7
34.0
38.4
43.0
47.7
3.5
3.78
7.68
11.7
15.9
20.2
24.6
29.2
33.9
38.7
43.7
48.8
54.0
4.0
4.3
8.74
13.3
18.0
22.8
27.8
32.9
38.1
43.5
49.0
54.6
60.4
4.5
4.8
9.8
14.9
20.1
25.5
31.0
36.6
42.4
48.2
54.3
60.4
66.7
5.0
5.36
10.9
16.5
22.2
28.1
34.1
40.3
46.6
53.0
59.5
66.2
73.0
6
6.42
13.0
19.6
26.5
33.4
40.5
47.7
55.0
62.5
70.1
7
7.47
15.1
22.8
30.7
38.7
46.8
55.0
63.4
71.9
8
8.52
17.2
26.0
34.9
43.9
53.1
62.4
71.8
9
9.57
19.3
29.1
39.1
49.1
59.4
69.7
80.2
10
10.6
21.4
32.2
43.2
54.4
65.6
77.0
12
12.7
25.5
38.5
51.5
64.7
78.1
14
14.8
29.6
44.7
59.8
75.1
16
16.8
33.7
50.8
68.0
85.3
18
18.8
37.8
56.9
76.1
20
20.8
41.8
62.9
84.1
24
24.8
49.6
74.6
30
30.4
61.0
91.6

Figure 11. Beam centerline height for various ranges (RHI) as a function of elevation angle under standard reflective conditions (from FMH -7b). Curves are derived from Equation 12.