THE AERODYNAMICS OF A SPINNING SHELL. 
821 
Round W. 19 
Screen I) 
Gun rifled V30; MY 1 , 547 y /s 
Round W.m 
Screen. R 
Gun rifled V 50 ; MY 1,547# 
MTE:-The teeth, which are usually left 
between tie cuts .produced If the dr map 
baud, are in lias case entirely remeed 
bp fanning. 
Hole circular, diam r 3-04 
<P indeter minate, Yaw= 0 ■ o° 
Round 1 .13 
Screen A 
Gun rifled 14 0 • KY 3 51 A? 
Round lY n 
Screen A 
AA= 3-o5"(about 
Yaw=o- 4 ° 
OA =i-&o" ^ 
Yaw=o-5'3° JF 
Approved jA 
NOTE:- A A is very doubtful as fie 
' card has beep bruised near the top 
bp the shell, out ON. is well determined. 
/Round 31.18 
f Screen K 
Gun rifled Y 0 ;11Y 
^ 'V Ya w= 3-S6 c 
\ OA = Z-19" 
f JP Yaw= 4 - 19 0 
; A %J r Approved 
yaw= 4-0° 
Note the sudden endinp%. $ = 2,90 
of the clean cut holes \ 
produced bp the drioing\t&nd, at each 
side of the hole, \fhis often 
i&dSllilplfo helps to determnK . 
*AA'= 3 -io"? 
Yaw=i-o°? / 
0 A' = i-Ti" / 
Yaw= i-Zm° 
Approved yaw 1-2°; 6 = 15 0 
"NOTEThe hole is bruised at the top bepono: 
the black circle. 
Fig. 8 a. 
2 y 2 
e 
