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To determine the change in torque, it is necessary to
know the drag area change, TAS, PA, and FAT. From the
table below find the drag area change associated with
the configuration, or estimate if necessary. Enter chart
at known drag area change, move right to TAS, move
down to PA, move left to FAT, then move down and read
change in engine torque.
7A-8-3. Conditions.
The drag chart is based on operating at 100% RRPM.
Table 7A–8-1. Change in Drag Area of Typical
External Loads
LOAD
DRAG AREA
CHANGE SQ
FT
CONTAINERS: (1)
8 FT x 8FT x 20 FT CONEX 150/100(2)
ISU-60 62
ISU-90 81
(2) ISU-90 115(2)
(2) 500 GAL FUEL CELLS 40
(3) 500 GAL FUEL CELLS 60
(4) 500 GAL FUEL CELLS 80
TRUCKS: (1)
HMMWV (ENCLOSED VEHICLE)
49/28(2)
HMMWV (TOW LAUNCHER) 54/31(2)
M34 1/2 TON DUMP 100
M35 2 1/2 TON CARGO 80
HOWITZERS:
M2A1-105MM 50
M102-105MM 50
M198-105MM 149/50(2)
HELICOPTERS:
OH-58 HELICOPTER 93(3)
UH-60 HELICOPTER 175(3)
AH-64 HELICOPTER 170(3)
CH-47 HELICOPTER 230(2)(4)
(1) RIGGED IN ACCORDANCE
WITH FM 10-450
(2) WITH DUAL POINT SUSPEN
SION
(3) RIGGED IN ACCORDANCE
WITH TM-1-1670-260-12&P
(UNMARK)
(4) RIGGED IN ACCORDANCE
WITH TM 1-1520-240-BD
DATA
BASIS:
ESTIMATED/
FLIGHT TEST
TM 1-1520-240-10
7A-8-2
Figure 7A-8-1. Drag Chart
TM 1-1520-240-10
7A-9-1
SECTION IX. CLIMB DESCENT
7A-9-1. Description.
a. Climb and descent performance may be seen in
figure 7A-9-1, which represents change in torque to climb
or descend at selected GWs.
b. The climb performance charts, figure 7A-9-2,
shows relationships between GW, initial and final altitude
and temperatures, time to climb, and distance covered
and fuel used while climbing. The chart is presented for
climbing at hotter and colder temperatures, intermediate
torque (30 minute operation).
7A-9-2. Use of Chart.
The primary use of the charts is illustrated by the chart
examples.
a. To determine torque change for a specific rate of
climb or rate of descent (fig. 7A-9-1), enter rate of climb
or descent and move right to gross weight, move down
and read change. This torque change must be added to
the torque required for level flight for climb, or subtracted
for descent, to obtain total climb or descent torque.
b. Rate of climb or descent may also be obtained by
entering with a known torque change, moving upward to
gross weight, moving left and reading rate of climb or
descent.
c. To use the climb performance charts (fig. 7A-9-2),
enter at the top left at the known gross weight, move right
to the initial press alt (pressure altitude), move down to
the FAT at that altitude, and move left and record time,
distance, and fuel. Subtract the time, distance, and fuel
values of the initial altitude-temperature condition from
those of the final altitude-temperature condition to find
the time to climb, distance covered, and fuel used while
climbing.
7A-9-3. Conditions.
The climb and descent charts are based on 100%
RRPM. The climb speed schedule shown in figure
7A-9-2 (see insert) is for optimum climb, that is, minimum
power required and maximum power available (30 minutes).
It is an average schedule for the GW range and
atmospheric conditions for the CH-47D.
TM 1-1520-240-10
7A-9-2
Figure 7A-9-1. Climb – Descent Chart
TM 1-1520-240-10
7A-9-3
Figure 7A-9-2. Climb Performance (Sheet 1 of 2)
TM 1-1520-240-10
7A-9-4
Figure 7A-9-2. Climb Performance (Sheet 2 of 2)
TM 1-1520-240-10
7A-10-1
SECTION X. FUEL FLOW
7A-10-1. Description.
The idle fuel flow chart (fig. 7A-10-1) presents engine fuel
flow sensitivity to PA and FAT for ground idle and flight
idle.
7A-10-2. Use of Chart..
The primary use of charts is illustrated by the example.
To determine idle fuel flow, it is necessary to know idle
condition, PA, and FAT. Enter PA, move right to FAT,
move down and read fuel flow.
7A-10-3. Conditions.
a. Presented charts are based on the use of JP-4
fuel.
b. Ground idle is defined at 50 to 59% N1.
c. Thrust ground detent is defined as engine condition
levers at FLT, NR selected 97%, and thrust control at
the detent.
d. The single engine fuel flow chart (fig. 7A-10-2)
baseline in 0C. Increase or decrease fuel flow by 1
percent for every 10C change in temperature.
7A-10-4. EAPS Installed.
Increase fuel flow by an additional 1%.
TM 1-1520-240-10
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