TM 1-1520-238-10
7-16
EXAMPLE I
WANTED
TORQUE REQUIRED, AIRSPEED, AND FUEL FLOW
FOR MAXIMUM RANGE.
KNOWN
PRESSURE ALTITUDE = SL, FAT = +10C, AND
GROSS WEIGHT = 14,000 POUNDS.
METHOD
AT THE INTERSECTION OF THE MAXIMUM RANGE
LINE AND THE 14,000 POUND LINE
MOVE LEFT, READ IAS = 127 KN.
MOVE RIGHT, READ TAS = 130 KN.
MOVE UP, READ TOTAL FUEL FLOW = 970 LB/HR.
MOVE DOWN, READ INDICATED TORQUE/ENGINE = 59%.
EXAMPLE II
WANTED
TORQUE REQUIRED, AIRSPEED, AND FUEL FLOW
FOR MAXIMUM ENDURANCE.
KNOWN
PRESSURE ALTITUDE = SL, FAT = +10C, AND
GROSS WEIGHT = 14,000 POUNDS.
METHOD
AT THE INTERSECTION OF THE MAXIMUM
ENDURANCE AND THE 14,000 POUND LINE
MOVE LEFT, READ IAS = 66KN.
MOVE RIGHT, READ TAS = 73 KN.
MOVE UP, READ TOTAL FUEL FLOW = 717 LB/HR.
M0VE DOWN, READ INDICATED TORQUE/ENGINE = 34%
EXAMPLE III
(INTERPOLATION NOT ILLUSTRATED)
WANTED
MAXMIUM ENDURANCE, AIRSPEED, FUEL FLOW, AND TORQUE.
KNOWN
PRESSURE ALTITUDE = 1000 FT, FAT = +15C,
AND GROSS WEIGHT = 14,000 POUNDS.
METHOD
READ AIRSPEED, TORQUE, AND FUEL FLOW FOR EACH
ADJACENT ALTITUDE AND FAT, THEN INTERPOLATE
BETWEEN FAT AND ALTITUDE AS FOLLOWS:
M01-050
700
900
1100
1300
160
160
150
140
130
120
110
90
80
70
60
50
40
30
20
10
0
100
150
140
130
120
110
100
90
80
70
60
50
40
30
20
30
40
50
60
70
80
90
100
170
FAT=+10C
TOTAL FUEL FLOW–POUNDS PER HOUR
DF=10.0 SQ.FT.
DQ–%
0
10
20
MAX R/C
OR
MAX END
ALTITUDE
SEALEVEL
2000 FEET
SOLUTION
FAT
TORQUE
FUEL FLOW
IAS
TAS
1000 FEET
15
34
709
64
73
10
35
700
64
73
20
35
700
63
73
10
34
717
66
73
20
34
720
65
73
MAX RANGE
170
CRUISE
PRESSURE ALTITUDE - SEA LEVEL
100% RPM, 8 HELLFIRE CONFIGURATION, JP-4 FUEL
AH–64A
CRUISE
T700–GE–701
INDICATED TORQUE PER ENGINE
~
%
Figure 7-8.
Cruise Chart, Example, Sea Level, +10 C
