TM 1-1520-238-10
7-15
INDICATED TORQUE PER ENGINE
~
%
M01-114
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
MAX
RANGE
EXAMPLE
WANTED
KNOWN
METHOD
TORQUE REQUIRED AND FUEL FLOW
FOR 76 ROCKET CONFIGURATION
PRESSURE ALTITUDE = S.L., FAT = + 10C,
GW = 14,000 LB, 4 LOADED ROCKET
LAUNCHERS (76 ROCKETS), IAS – 150 KN
FROM DRAG CHART (FIG 7-18) OBTAIN
MULTIPLYING FACTOR = –0.42
ENTER CRUISE CHART AT IAS = 150 KN
MOVE RIGHT TO BROKEN D Q LINE
MOVE UP TO READ D Q = 12.8%
MULTIPLY D Q BY MULTIPLYING FACTOR
TO GET CHANGE IN TORQUE = –5.2%
RE–ENTER CRUISE CHART AT IAS = 150 KN
MOVE RIGHT TO GW – 14,000 LB
MOVE DOWN AND READ INDICATED
TORQUE PER ENGINE = 84.2%
TORQUE REQUIRED = 84.2 – 5.2 = 79.8 %
RE–ENTER CRUISE CHART AT 79.8%
MOVE UP AND READ FUEL FLOW = 1183 LB/HR
170
CRUISE
PRESSURE ALTITUDE - SEA LEVEL
100% RPM, 8 HELLFIRE CONFIGURATION, JP-4 FUEL
AH–64A
CRUISE
T700–GE–701
Figure 7-7.
Cruise Chart, Example
