TM 1-1520-238-10
7A-17
FROM DRAG CHART (FIG 7A-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
= 12.8%
MULTIPLY
D
Q BY MULTIPLYING FACTOR
TO GET CHANGE IN TORQUE = –5.4%
RE–ENTER CRUISE CHART AT IAS = 150 KN
MOVE RIGHT TO GW = 14,000 LB
MOVE DOWN AND READ INDICATED
TORQUE PER ENGINE = 93.5%
TORQUE REQUIRED = 93.5 –5.4 = 88.1%
RE–ENTER CRUISE CHART AT 88.1%
MOVE UP AND READ FUEL FLOW = 1306 LB/HR
M01-233
TORQUE REQUIRED AND FUEL FLOW
FOR 76 ROCKET CONFIGURATION
20
40
1400
800
1200
160
TOTAL FUEL FLOW – LB/HOUR
1000
CRUISE
170
150
140
160
140
130
170
10
D
F = 10.0 SQ FT
D
Q – %
0
20
80
30
EXAMPLE
100
150
WANTED
KNOWN
METHOD
PRESSURE ALTITIDE = S.L., FAT = +10
C,
GW=14,000 LB, 4 LOADED ROCKET
LAUNCHERS (76 ROCKETS), IAS = 150 KN
50
60
100
70
110
120
40
80
90
10
90
20
130
0
50
60
40
80
90
70
120
30
70
110
PRESSURE ALTITUDE - SEA LEVEL
100
60
FAT=+10C
100% RPM, 8 HELLFIRE CONFIGURATION, JP-4 FUEL
50
AH–64A
CRUISE
T700–GE–701C
MAX
RANGE
INDICATED TORQUE PER ENGINE
~
%
MAX R/C
OR
MAX END
30
Figure 7A-7.
Cruise Chart, Example
