TM 1-1520-238-10
7-12
Change 3
DATA BASE:
DERIVED FROM FLIGHT TEST
NOTE:
USE DASHED LINES FOR 4 EXTERNAL TANKS INSTALLED
USE SOLID LINES FOR NO EXTERNAL TANKS INSTALLED
HOVER
ZERO WIND, 100% ROTOR RPM
LEVEL SURFACE
EXAMPLE
WANTED
TORQUE REQUIRED TO HOVER
AT 10 FEET WHEEL HEIGHT WITH
NO EXTERNAL TANK INSTALLED.
KNOWN
FAT = 205 C
PRESSURE ALTITUDE = 5600 FEET
GROSS WEIGHT = 15,000 POUNDS
METHOD
ENTER CHART AT PRESSURE
ALTITUDE 5600 FEET.
MOVE RIGHT TO FAT = 205 C.
MOVE DOWN TO GROSS WEIGHT = 15,000
POUNDS (SOLID LINE)
MOVE LEFT TO WHEEL HEIGHT
10 FEET, THEN MOVE UP
AND READ TORQUE REQUIRED 71.5%
110
100
90
80
70
60
50
40
15000
12500
10000
7500
5000
2500
-5000
0
5000
10000
15000
20000
115
110
105
100
95
90
85
80
75
70
65
60
55
DENSITY ALTITUDE
~
FEET
TORQUE PER ENGINE
~
%Q
M01-305A
AH-64A
HOVER
T700-GE-701
Figure 7-6.
Hover Chart
