TM 1-1520-238-10
7A-69
Section VII. CLIMB-DESCENT
7A.25. DESCRIPTION.
The climb descent chart (fig 7A-19) shows the change in
torque (above and below the torque required for level
flight under the same configuration, gross weight, and at-
mospheric conditions) to obtain a desired rate of climb or
descent.
7A.26. USE OF CHART.
The primary use of the climb-descent chart is illustrated by
the example. To determine the change in torque, it is nec-
essary to know the gross weight and the desired rate of
climb or descent. Enter the chart at the desired rate of
climb or descent, move right to the known gross weight,
and then move down and read the torque change. This
torque change must be added to (for climb) or subtracted
from (for descent) the torque required for level flight (ob-
tained from the appropriate cruise chart) to obtain a total
climb or descent torque.
By entering the chart with a known torque change, and
moving up to the known gross weight and then left, the
corresponding rate of climb or descent can also be ob-
tained.
7A.27. CONDITIONS.
The climb-descent chart is based on 100% rotor rpm.
