68
Strip
T"
à
ò
i
Flight direction
Fig. 2. - Scheme Showing the Transfer Points u, m, l.
These differences were determined as standard differences (root mean square
differences) m x , m Y , m a and are shown in Table I.
TABLE I — STANDARD DIFFERENCES 7ÏI x , m B OF POINTS COMMON TO SUCCESSIVE MODELS I m 2
Standard Difference
Points
u
m
l
meters
meters
meters
m x
± 0.97
± 0.80
± 0.84
m Y
1 .02
0.96
1.04
m H
2.38
1.27
1.74
(elevation difference)
It can be seen from this table that the coordinate differences are somewhat
smaller for the center transfer points « m » when compared with the wing transfer
points « u » and « l ».
After performing the adjustment of the longitudinal strips, coordinate differences
Ax, and Ay, and elevation differences AH for points in the sidelap of adjacent longi
tudinal strips (common points for adjacent longitudinal strips), were determined.
The corresponding standard differences (total and irregular) as well as the systematic
(constant) differences are listed in table II. The total coordinate differences are also
illustrated in Figures 3a, 36, and 3c.
TABLE II COORDINATE DIFFERENCES IN COMMON POINTS OF ADJACENT LONGITUDINAL STRIPS AFTER STRIP ADJUST-
MENT [Z IN DIRECTION OF LONGITUDINAL STRIPS,
SA 2
• m 2 =
n
Y PERPENDICULAR TO X, AND H — ELEVATION]*
Sidelap Number Standard Total Differences Systematic Differences Standard Irreg. Differences
Between of Common
Strips
Points
m x
m Y
%
Ax
A z
A//
m x
m Y
meters
meters
meters
meters
meters
meters
meters
meters
meters
1-2
19
± 11.3
± 16.9
± 21.0
— 7.0
— 9.8
— 13.2
± 9.0
± 13.6
± 16.3
2-3
18
7.4
12.4
18.4
0
— 0.5
+ 9.0
7.4
12.3
15.9
3-4
21
5.2
8.7
12.4
0
+ 7.2
— 5.4
5.2
5.0
10.9
4-5
16
12.6
11.7
17.8
+ 3.0
+ 2.5
0
12.1
11.5
17.8
5-6
26
5.6
9.4
8.7
+ 0.7
— 6.0
— 3.0
5.5
7.2
8.1
6-7
18
6.1
10.1
8.5
+ 3.7
— 1.8
— 2.4
4.7
9.9
8.1
7-8
21
6.8
6.0
10.6
— 1.0
— 4.7
+ 7.0
6.7
3.9
8.1
Average
20
± 8.0
± 11.0
± 14.0
— 0.1
— 1.9
— 1.1
± 7.6
± 9.7
± 12.8
