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ammo magazine on left side, and a standard landing due to external cargo load are shown below.
gear, and both crew doors installed.
7-22. CONDITIONS.
The drag chart is based upon level aircraft attitude and
100% NR and NP.
7-39
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Figure 7-6. Drag Chart (Sheet 1 of 2)
7-40
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Figure 7-6. Drag Chart (Sheet 2 of 2)
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SECTION VII. CLIMB-DESCENT OH-58D (T703-AD-700A/
250-C30R)
7-23. CLIMB-DESCENT CHART. obtain a total climb or descent torque. The torque
required for level flight is obtained from the appropriate
The climb-descent chart (fig. 7-7 and 7-8) show the cruise chart.
change in torque above or below torque required for
level f l i g h t under the same gross weight and b. By entering the bottom of the grid with a known
atmospheric conditions to obtain a given rate of climb
torque change, moving upward to the gross weight, and
or descent.
then left, the corresponding rate of climb or descent
may also be obtained.
7-24. USE OF CHART.
The primary uses of the chart are illustrated by the 7-25. CONDITIONS.
chart examples.
The climb-descent chart is based on the use of 100%
a. The torque change obtained from the grid scale rpm. The rate of climb (descent presented is for steady
must be added to (for climb) or subtracted from (for state conditions and rpm bleed could increase
descent) the torque required for level flight in order to (decrease) rate of climb (descent) shown.
7-42
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Figure 7-7. Climb-Descent Chart
7-43
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Figure 7-8. Climb Performance Chart
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SECTION VIII. FUEL FLOW OH-58D (T703-AD-700A/250-
C30R)
7-26. FLAT PITCH FUEL FLOW CHART. temperature. Enter at the pressure altitude, move right
to FAT then move down and read fuel flow. Refer to the
The flat pitch fuel flow chart (fig. 7-9) shows the fuel cruise charts to obtain fuel flow for cruise power
flow at flat pitch. conditions.
7-27. USE OF CHART. 7-28. CONDITIONS.
The primary use of the chart is illustrated by the
example. To determine the flat pitch fuel flow, it is This chart is based upon the use of JP-8 fuel and 100%
necessary to know pressure altitude and free air rpm.
7-45
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Figure 7-9. Flat Pitch Fuel Flow Chart
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7-29. FUEL FLOW VS TORQUE CHART. percent with the bleed air heater on and 3 percent with
anti-ice on. When both systems are on, increase fuel
The fuel flow for this helicopter (particle separator flow 5 percent. Also a range or endurance penalty
installed) is presented in figure 7-10. Fuel flow vs should be accounted for when working cruise chart
torque shows fuel flow in pounds-per-hour versus data. A fairly accurate rule-of-thumb to correct fuel flow
torquemeter %Q for pressure altitudes from sea level to for temperatures other than 0 °C FAT is to increase
12,000 feet and for 0 °C free air temperature. (decrease) fuel flow one percent for each 10 °C
increase (decrease) in FAT.
7-30. USE OF CHART.
The primary use of this chart is illustrated by the 7-31. CONDITIONS.
examples to determine fuel flow. It is necessary to
know the mast torque (%Q) and the FAT as well as the The chart is based on JP-8 fuel, 100% rpm and bleed
pressure altitude. Fuel flow will increase about 2 air heater and anti-ice off.
7-47
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Figure 7-10. Fuel Flow vs Torque Chart
7-48
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SECTION IX. MAST TORQUE AVAILABLE OH-58D (250-
C30R/3)
7-32. DESCRIPTION. 7-34. CONDITIONS.
The chart is based on NR, NP 100 percent, and JP-8
The maximum torque available chart (fig. 7-11, sheets fuel, with bleed air heater and anti-ice off. Reduce
1 and 2) shows the effects of altitude and temperature torque available 3 percent if bleed air heater is on, 3.5
on mast torque and engine torque. Both pressure percent if anti-ice is on, and 6.5 percent if both systems
altitude and FAT affect engine power production. The are on. No reduction will occur if torque available is
chart shows power available data at 30 minute and transmission limited.
continuous operation power ratings in terms of the
allowable torque as recorded by the torquemeter (%Q). NOTE
Note that the power output capability of the 250-C30R/
3 engine can exceed the transmission structural limit Fuel grade JP-8/JP-5 will yield the same
(100%Q) under certain conditions. All %Q data shown nautical miles per pound as JP-4. Using JP-
8/JP-5 will only result in increased fuel
in this chapter is for mast torque. weight.
Prolonged IGE hover may increase engine inlet
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(68)
