Degrees of Curve to Radius
Degrees of Curve Table - O - S and HO scale Radiuses.
Degree of Curve
Proto Radius In Feet
O/n3 Inches
S/Sn3 Inches
HO/n3 Inches
1
5729.651'
1432.402"
1074.375"
789.389"
2
2864.934
716.233
537.175
394.710
3
1910.078
477.519
358.139
263.156
4
1432.685
358.100"
268.628
197.385
5
1146.279
286.569"
214.930
157.926
6
955.366
238.841"
179.131
131.623
7
819.020
204.755"
153.566
112.839
8
716.779
179.194"
134.396
98.753
9
637.275
159.318"
119.489
87.799
10
573.686
143.421"
100.816
79.038
11
521.672
130.418"
97.813
71.872
12
478.339
119.584"
89.688
65.902
13
441.684
110.421"
82.815
60.852
14
410.275
102.568"
76.973
56.525
15
383.065
95.766"
71.824
52.776
16
359.265
89.816"
67.362
49.497
17
338.273
84.568"
63.426
46.605
18
319.623
79.905"
59.929
44.035
19
302.943
75.735"
56.801
41.737
20
287.939
71.984"
53.988
39.670
21
274.370
68.592"
51.444
37.801
22
262.042
65.510"
49.132
36.102
23
250.793
62.698"
47.023
34.552
24
240.487
60.121"
45.091
33.132
25
231.011
57.752"
43.314
31.827
26
222.271
55.567"
41.675
30.623
27
214.183
53.545"
40.159
29.509
28
206.678
51.669"
38.752
28.475
29
199.696
49.924"
37.443
27.513
30
193.185
48.296"
36.222
26.616
31
187.099
46.774"
35.081
25.777
32
181.398
45.349"
34.012
24.992
33
176.047
44.011"
33.008
24.254
34
171.015
42.753"
32.065"
23.561
35
166.275
41.568"
31.176
22.908
36
161.803
40.450"
30.338
22.292
37
157.577
39.394"
29.545
21.710
38
153.578
38.394"
28.795
21.159
39
149.787
37.446"
28.085
20.637
40
146.190
36.547"
27.410
20.141
41
142.773
35.693"
26.769
19.670
42
139.521
34.880"
26.160
19.222
43
136.425
34.106"
25.579
18.796
44
133.473
33.368"
25.026
18.389
45
130.656
32.664"
24.498
18.001
46
127.965
31.991"
23.993
17.630
47
125.392
31.348"
23.511
17.276
48
122.930
30.732"
23.049
16.936
49
120.571
30.142"
22.607
16.611
50
118.310
29.577"
22.183
16.300
51
116.141
29.035"
21.776
16.001
52
114.059
28.514"
21.386
15.714
53
112.058
28.014"
21.010
15.439
54
110.134
27.533"
20.650
15.174
55
108.284
27.071"
20.303
14.919
56
106.503
26.625"
19.969
14.673
57
104.787
26.196"
19.647
14.437
58
103.133
25.783"
19.337
14.209
59
101.539
25.384"
19.038
13.989
60
100.000
25.000"
18.750
13.777
61
98.515
24.628"
18.471
13.573
62
97.080
24.270"
18.202
13.375
63
95.694
23.923"
17.942
13.184
64
94.354
23.588"
17.691
12.999
65
93.058
23.264"
17.448
12.821
66
91.804
22.951"
17.213
12.648
67
90.590
22.647"
16.985
12.481
68
89.415
22.353"
16.765
12.319
69
88.276
22.069"
16.550
12.162
70
87.172
21.793"
16.344
12.010
71
86.103
21.525"
16.144
11.863
72
85.065
21.266"
15.949
11.720
73
84.059
21.014"
15.858
11.581
74
83.082
20.770"
15.577
11.446
75
82.134
20.533"
15.400
11.316
76
81.213
20.303"
15.227
11.189
77
80.319
20.079"
15.059
11.066
78
79.451
19.862"
14.897
10.946
79
78.607
19.651"
14.738
10.830
80
77.786
19.446"
14.584
10.717
81
76.988
19.247"
14.435
10.607
82
76.213
19.053"
14.289
10.500
83
75.458
18.864"
14.148
10.396
84
74.724
18.681"
14.010
10.295
85
74.009
18.502"
13.876
10.196
86
73.314
18.328"
13.746
10.101
87
72.637
18.159"
13.619
10.007
88
71.978
17.994"
13.495
9.917
89
71.336
17.834"
13.375
9.828
90
70.711
17.677"
13.258
9.742
Degree of Curve
Proto Radius In Feet
O/n3 Inches
S/Sn3 Inches
HO/n3 Inches