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Figure 7-15. Cruise Chart, FAT +55 °C, 4000 to 6000 Feet (Sheet 23 of 23)
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SECTION XII. DRAG OH-58D (250-C30R/3)
7-41. DESCRIPTION. 7-42. USE OF CHART.
The drag chart (fig. 7-16) shows the basic configuration
or the equivalent flat plate drag area changes for This chart i s used to adjust cruise charts f o r
additional helicopter modifications. The cruise charts appropriate torque and fuel flow due to equivalent flat
depict the basic (baseline) configuration which includes plate drag area change (ΔF). Examples of change in
the drag for the mast mounted sight, a universal torque required due to equivalent flat plate drag area
weapon pylon with ejector racks on both sides, a 7 shot change (ΔF) from primary (baseline) configuration to an
rocket pod on right side, a .50 caliber machine gun and external load configuration and increase in drag area
ammo magazine on left, and a standard landing gear due to external cargo load are shown below.
and both crew doors installed.
7-43. CONDITIONS.
The drag chart is based upon level aircraft attitude and
100% NR and NP.
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Figure 7-16. Drag Chart (Sheet 1 of 2)
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Figure 7-16. Drag Chart (Sheet 2 of 2)
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SECTION XIII. CLIMB-DESCENT OH-58D (250-C30R/3)
7-44. 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. 7-17 and 7-18) shows 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.
7-45. USE OF CHART.
The primary uses of the chart are illustrated by the 7-46. 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.
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Figure 7-17. Climb-Descent Chart
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TIME, DISTANCE AND FUEL
GROSS WEIGHT = 4750 LB
INITIAL ALTITUDE = 7000 FT
FAT AT INITIAL ALTITUDE = 21°C
FINAL ALTITUDE = 11000 FT
Figure 7-18. Climb Performance Chart
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SECTION XIV. FUEL FLOW OH-58D (250-C30R/3)
7-47. 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. 7-19) shows the fuel cruise charts to obtain fuel flow for cruise power
flow at flat pitch. conditions.
7-48. USE OF CHART. 7-49. 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.
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Figure 7-19. Flat Pitch Fuel Flow Chart
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7-50. 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 is presented in figure 7- flow 5 percent. Also a range or endurance penalty
20. Fuel flow vs torque shows fuel flow in pounds-per- should be accounted for when working cruise chart
hour versus torquemeter (%Q) for pressure altitudes data. A fairly accurate rule-of-thumb to correct fuel flow
from sea level to 12,000 feet and for 0°C free air for temperatures other than 0°C FAT is to increase
temperature. (decrease) fuel flow one percent for each 10°C
increase (decrease) in FAT.
7-51. USE OF CHART.
The primary use of this chart is illustrated by the 7-52. 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.
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Figure 7-20. Fuel Flow vs Torque Chart
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CHAPTER 8
NORMAL PROCEDURES
SECTION I. MISSION PLANNING
8-1. MISSION PLANNING. passenger briefings; items that do not pertain to a
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(71)
