THE AERODYNAMICS OF A SPINNING SHELL. 
245 
Table III. — Mean values, for each group, of s, q and v ; the corresponding values of 
vja and / M ( vja , 0) ; and the percentage spread in s. Each half-period is treated 
separately in each group. 
Group. 
s. 
Percentage 
spread 
in s. 
7- 
V. 
vja. 
h • 
I. 8-10 
(1) 
0-896 
0-8 
0-213 
1063 
0-965 
11-80 
I. 9 
(2) 
0-932 
— 
0-084 
1053 
0-956 
11-56 
I. 17, 18 
(1) 
0-892 
4-3 
0-578 
1297 
1-181 
11-61 
I. 17, 18 
(2) 
0-908 
5-5 
0-597 
1264 
1-150 
12-01 
I. 5-7 
(1) 
1-000 
2-3 
0-398 
1560 
1-413 
10-56 
I. 5-7 
(2) 
1-007 
5-6 
0-507 
1517 
1-375 
11 -08 
I. 5 
(3) 
1-060 
— • 
_ 
1494 
1-354 
10-86 
II. 11-13 
(1) 
0-977 
3-1 
0-068 
1094 
0-994 
10-34 
II. 11-13 
(2) 
1-014 
5-5 
-0-04 
1075 
0-977 
10-30 
II. 14-16 
(1) 
0-987 
2-1 
0-284 
1315 
1-198 
10-20 
II. 14-16 
(2) 
1-006 
3-2 
0-066 
1286 
1-171 
10-47 
III. 11-13 
(1) 
0-946 
2-6 
-0-119 
1063 
0-966 
13-08 j 
III. 14-16 
(1) 
0-931 
1-8 
0-203 
1296 
1-180 
13-10 
III. 14-16 
(2) 
0-959 
3-6 
0-118 
1263 
1-150 
13-43 
III. 15, 16 
(3) 
0-990 
3-7 
— 
1239 
1-128 
13-52 
IV. 10-12 
(1) 
0-934 
0-3 
0-146 
877 
0-797 
10-00 
IV. 10-12 
(2) 
0-975 
3-8 
0-033 
866 
0-787 
9-79 
IV. 7-9 
(1) 
.0-852 
4-5 
0-793 
1532 
1-385 
11-40 
IV. 8 
(2) 
0-864 
— 
0-820 
1488 
1-345 
11-93 
IV. 1-3, 5 
(1) 
0-897 
3-5 
0-987 
2102 
1-905 
10-80 
IV. 1-3, 5 
(2) 
0-907 
3-5 
0-885 
2052 
1-860 
11-20 
The values of f u here given are not corrected for the effect of the cards. 
§ 9. The Values of b. 
The value of b represents the initial angular velocity of the axis of the shell, for at the 
beginning of the first half-period rosette motion may be assumed and S' = b{}. The 
values of b for each round are given in Table IV. 
Table IV.—Values of b ( — S' 0 /Q), where V 0 is the initial angular velocity of the axis 
of the shell. 
Group. 
Values of b. 
Mean. 
I. 8-10 
0-018 
0-011 
0-023 
0-017 
I. 17, 18 
0-017 
0-022 
0-019 
I. 5-7 
0-021 
0-023 
0-009 
0-018 
II. 11-13 
0-020 
0-017 
0-014 
0-017 
II. 14-16 
0-016 
0-018 
0-018 
0-017 
Group. 
Values of b. 
Mean. 
III. 11-13 
0-007 
0-006 
0-007 
0-007 
III. 14-16 
0-011 
0-016 
0-011 
0-013 
IV. 10-12 
0-024 
0-013 
0-013 
0-017 
IV. 7-9 
0-012 
0-007 
0-032 
0-017 
IV. 1-3, 5 
0-024 
0-008 
0-010 
0-015 
0-014 
M 
