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speed TAS, move right to the broken D Q line, and move
up and read D Q. Multiply D Q by the multiplying factor
to obtain change in torque, then add or subtract change
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in torque from torque required for the primary mission
configuration. Enter the cruise chart at resulting
torque required, move up, and read fuel flow. If the resulting
torque required exceeds the governing torque
limit, the torque required must be reduced to the limit.
The resulting reduction in airspeed may be found by
subtracting the change in torque from the limit torque;
then enter the cruise chart at the reduced torque, and
move up to the gross weight. Move left or right to read
TAS or IAS. To determine the airspeed for maximum
range for alternative wing stores configuration, reduce
the value from the cruise chart by 2 knots for each 5
square feet increase in drag area, D F, or increase maximum
range airspeed 2 knots for each 5 square feet reduction
in drag area. For example, for 16 Hellfire configuration
D F = 9.6 square feet, from figure 7-18.
Therefore, maximum range airspeed would be reduced
by 2/5 x 9.6= 3.84 knots, or approximately 4 knots.
7.20.7 Additional Uses. The low-speed end of the
cruise chart (below 40 knots) is primarily to familiarize
you with the low-speed power requirements of the helicopter.
It shows the power margin available for climb or
acceleration during maneuvers, such as NOE flight. At
zero airspeed, the torque represents the torque required
to hover out of ground effect. In general, mission
planning for low-speed flight should be based on hover
out of ground effect.
7.21 CONDITIONS.
The cruise charts are based on 100% rotor rpm, ATF or
ETF = 1.0, ENG INLET ANTI-ICE switch OFF, JP-4
fuel and dual-engine operation. Engine inlet anti-ice
and rotor blade de-ice effect are as follows:
a. With ENG INLET ANTI-ICE switch ON, fuel
flow will increase approximately 60 pounds per hour,
maximum torque available could be reduced by as
much as 16%, and maximum continuous torque available
could be reduced by as much as 17%.
b. With rotor BLADE de-ice switch ON, fuel flow
will increase approximately 30 pounds per hour, and
torque required will increase 1.4%.
For example, with ENG INLET ANTI-ICE and rotor
BLADE de-ice off, torque required, from cruise chart is
50%, and maximum continuous torque is 92%. With
ENG INLET ANTI-ICE and rotor BLADE de-ice ON,
torque required will be 50 + 1.4= 51.4%, and maximum
continuous torque will be approximately 92 - 17 = 75%.
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Figure 7-7. Cruise Chart, Example
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Figure 7-8. Cruise Chart, Example, Sea Level, +10°C
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Figure 7-9. Cruise Chart, Sea Level -50 0C (Sheet 1 of 7)
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Figure 7-9. Cruise Chart, Sea Level, -40° and -30°C (Sheet 2 of 7)
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Figure 7-9. Cruise Chart, Sea Level, -20° and -10°C (Sheet 3 of 7)
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Figure 7-9. Cruise Chart, Sea Level, 0° and +10°C (Sheet 4 of 7)
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Figure 7-9. Cruise Chart, Sea Level, +20° and +30°C (Sheet 5 of 7)
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Figure 7-9. Cruise Chart, Sea Level, +40° and +50°C (Sheet 6 of 7)
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Figure 7-9. Cruise Chart, Sea Level, +60°C (Sheet 7 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, -50°C (Sheet 1 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, -40° and -30°C (Sheet 2 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, -20° and -10°C (Sheet 3 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, 0° and +10°C (Sheet 4 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, +20° and +30°C (Sheet 5 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, +40° and +50°C (Sheet 6 of 7)
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Figure 7-10. Cruise Chart, 2,000 Feet, +60°C (Sheet 7 of 7)
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Figure 7-11. Cruise Chart, 4,000 Feet, -50°C (Sheet 1 of 7)
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Figure 7-11. Cruise Chart, 4,000 Feet, -40° and -30°C (Sheet 2 of 7)
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Figure 7-11. Cruise Chart, 4,000 Feet, -20° and -10° C (Sheet 3 of 7)
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Figure 7-11. Cruise Chart, 4,000 Feet, 0° and +10°C (Sheet 4 of 7)
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