TM 1-1520-238-10
7A-18
M01-234
METHOD
IAS
FUEL FLOW
TORQUE
FAT
SOLUTION:
ADJACENT ALTITUDE AND FAT, THEN INTERPOLATE
READ AIRSPEED, TORQUE, AND FUEL FLOW FOR EACH
PRESSURE ALTITUDE = 1000 FEET FAT = +15
C,
MAXIMUM ENDURANCE, AIRSPEED, FUEL FLOW,
MOVE UP, READ TOTAL FUEL FLOW = 756 LB/HR.
MOVE RIGHT, READ TAS = 72 KN.
MOVE LEFT, READ IAS = 66 KN.
ENDURANCE AND THE 14,000 POUND LINE
AT THE INTERSECTION OF THE MAXIMUM
PRESSURE ALTITUDE = SL, FAT = +10
C, AND
TORQUE REQUIRED, AIRSPEED, AND FUEL FLOW
MOVE UP, READ TOTAL FUEL FLOW = 1019 LB/HR.
MOVE RIGHT, READ TAS = 128 KN.
MOVE LEFT, READ IAS = 124 KN.
LINE AND THE 14,000 POUND LINE
AT THE INTERSECTION OF THE MAXIMUM RANGE
PRESSURE ALTITUDE = SL, FAT = +10
C, AND
TORQUE REQUIRED, AIRSPEED, AND FUEL FLOW
73
METHOD
KNOWN
WANTED
FOR MAXIMUM RANGE.
1000
1200
800
1400
90
80
130
40
120
20
10
150
140
110
170
0
70
100
60
50
30
70
90
80
40
60
TOTAL FUEL FLOW – LB/HOUR
70
120
80
20
40
30
30
50
90
60
170
100
150
100
130
140
KNOWN
WANTED
MOVE DOWN, READ INDICATED TORQUE/ENGINE = 35%.
TAS
20
100% RPM, 8 HELLFIRE CONFIGURATION, JP-4 FUEL
CRUISE
PRESSURE ALTITUDE - SEA LEVEL
65
EXAMPLE II
METHOD
KNOWN
GROSS WEIGHT = 14,000 POUNDS.
160
FOR MAXIMUM ENDURANCE.
FAT=+10C
110
MOVE DOWN, READ INDICATED TORQUE/ENGINE=61%.
73
GROSS WEIGHT = 14,000 POUNDS.
EXAMPLE I
1000 FEET
2000 FEET
SEA LEVEL
ALTITUDE
BETWEEN FAT AND ALTITUDE AS FOLLOWS:
15
63
733
72
36
160
20
65
761
AND GROSS WEIGHT = 14,000 POUNDS,
AND TORQUE.
(INTERPOLATION NOT ILLUSTRATED)
35
WANTED
EXAMPLE III
745
35
50
AH–64A
CRUISE
T700–GE–701C
73
64
731
35
10
10
72
66
756
35
MAX
RANGE
10
0
20
D
F = 10.0 SQ FT
D
Q – %
INDICATED TORQUE PER ENGINE
~
%
MAX R/C
OR
MAX END
Figure 7A-8.
Cruise Chart, Sea Level, +10 C Example
