TM 55-1520-228-10
SECTION XIV. DRAG
7-50. DESCRIPTION.
The drag chart (figure 7-16) shows the torque change
required for flight due to drag area change as a result of
external configuration changes. Note that the figure
shows drag area change due to specific configurations.
7-51. USE OF CHART.
The primary use of the chart is illustrated by the
example. To determine the change in torque it is
necessary to know the drag area change, the true
airspeed, the pressure altitude, and the free air
temperature. Enter at the known drag area change,
move right to TAS, move down to pressure altitude,
move left to FAT, then move down and read change in
torque. In addition, by entering the chart in the opposite
direction, drag area change may be found from a known
torque change.
This chart is used to adjust cruise charts (figure 7-15,
sheets 1 through 13) for appropriate torque and fuel flow
due to equivalent flat plate drag area change ( F).
7-52. CONDITIONS.
The drag chart is based upon 100% rpm.
7-76
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