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Figure 7-2. Maximum Torque Available Chart (Sheet 2 of 2)
7-6
TM 1-1520-238-10
Figure 7-3. Torque Factor Chart
7-7
TM 1-1520-238-10
Figure 7-4. Torque Conversion Chart
7-8
TM 1-1520-238-10
Section Ill. HOVER CEILING
7.13 DESCRIPTION.
The hover ceiling chart (fig 7-5) presents the maximum
gross weight for hover at various conditions of pressure
altitude, free air temperature, and wheel height, using
maximum torque available, 30 minute limit.
7.14 USE OF CHART.
The primary use of the chart is illustrated by the example.
To determine the maximum gross weight for hover,
it is necessary to know the pressure altitude, free air
temperature, and desired wheel height. Enter the chart
at the pressure altitude, move right to FAT, move down
to the desired wheel height, and then move left and
read maximum gross weight.
7.15 CONDITIONS.
The hover ceiling chart is based on maximum torque
available, 30 minute limit, 100% rotor rpm, ATF = 1.0,
ENG INLET ANTI-ICE switch OFF and rotor
BLADE de-ice switch off. For ENG INLET ANTI-ICE
switch ON, use dashed lines. Applicable configuration
is all external stores except four external fuel tanks.
For the four external tank configuration, reduce the
maximum gross weight for hover, as calculated from
the hover ceiling chart, by 11 pounds for each 1000
pounds of gross weight. See the examples below.
HOVER CEILING
EXAMPLE I EXAMPLE II
WANTED WANTED
MAXIMUM GROSS WEIGHT FOR HOVER AT 1O-FOOT MAXIMUM GROSS WEIGHT FOR HOVER AT IO-FOOT
WHEEL HEIGHT, ENGINE INLET ANTI-ICE OFF. WHEEL HEIGHT, ENGINE INLET ANTI-ICE ON.
KNOWN KNOWN
PRESSURE ALTITUDE = 10,000 FEET. PRESSURE ALTITUDE = 10,000 FEET.
FAT = -10°C. FAT = -10° C.
WHEEL HEIGHT = 10 FEET. WHEEL HEIGHT = 10 FEET.
METHOD METHOD
ENTER PRESSURE ALTITUDE SCALE AT 10,000 FT.
MOVE RIGHT TO -10°C FAT, SOLID LINE.
MOVE DOWN TO 10 FEET WHEEL HEIGHT.
MOVE LEFT TO READ GROSS WEIGHT TO
HOVER = 16,400 POUNDS.
WITH 4 EXTERNAL TANKS INSTALLED
HOVER GW = 16,400 -11 (16,400/1000)
= 16,220 POUNDS.
ENTER PRESSURE ALTITUDE SCALE AT 10,000 FT.
MOVE RIGHT TO -10°C FAT, DASHED LINE.
MOVE DOWN TO 10 FEET WHEEL HEIGHT.
MOVE LEFT TO READ GROSS WEIGHT TO
HOVER = 15,200 POUNDS.
WITH 4 EXTERNAL TANKS INSTALLED
HOVER GW = 15,200 -11 (15,200/1000)
= 15,033 POUNDS.
7-9
TM 1-1520-238-10
Figure 7-5. Hover Ceiling Chart
7-10
TM 1-1520-238-10
Section IV. HOVER LIMITS
7.16 DESCRIPTION.
The hover chart (fig 7-6) shows the torque required to
hover at various conditions of pressure altitude, free air
temperature, gross weight, wheel height, and with external
tanks or without external tanks.
7.17 USE OF CHART.
The primary use of the chart is illustrated by the example.
To determine the torque required to hover, it is necessary
to know the pressure altitude, free air temperature,
gross weight, and desired wheel height. Enter the
upper right grid at the known pressure altitude, move
right to the temperature, move down to the gross
weight, move left to the desired wheel height, and then
move down and read the torque required to hover.
In addition to its primary use, the hover chart maybe
used to predict the maximum hover height. To determine
maximum hover height, it is necessary to know
pressure altitude, free air temperature, gross weight,
and maximum torque available. Enter the known pressure
altitude, move right to the temperature, move
down to the gross weight, then move left to intersection
with maximum torque available and read wheel height.
This wheel height is the maximum hover height.
The hover chart may also be used to determine the
maximum gross weight for hover at a given wheel
height, pressure altitude, and temperature condition.
Enter at the known pressure altitude, move right to the
temperature, then draw a line down to the bottom of
the lower grid. Now enter lower grid at maximum
torque available, move up to wheel height, and then
move right to intersect the previously drawn line and
read gross weight. This is maximum gross weight at
which the helicopter will hover.
7.18 CONDITIONS.
The hover chart is based on calm wind, level surface,
100% rotor rpm and rotor BLADE de-ice switch off.
With rotor BLADE de-ice switch ON, torque required
will increase 1.4%
7-11
TM 1-1520-238-10
Figure 7-6. Hover Chart Mill
7-12 Change 3
TM 1-1520-238-10
7.19 DESCRIPTION.
The cruise charts (figs
Section V.
7-7 thru 7-17) present the levelflight
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