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temperature as much as 10 °C; therefore, a 10 °C
higher FAT must be used to correct for this condition.
7-33. USE OF CHART.
Primary use of the chart is illustrated by the example.
In general, to determine the maximum torque available,
it is necessary to know the pressure altitude and
temperature.
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Figure 7-11. Maximum Torque Available Chart (30 Minute Operation) (Sheet 1 of 2)
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Figure 7-11. Maximum Torque Available Chart (Continuous Operation) (Sheet 2 of 2)
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SECTION X. HOVER OH-58D (250-C30R/3)
7-35. DESCRIPTION. maximum hover height. To determine maximum hover
height, proceed as follows:
The hover charts (figures 7-12 through 7-14, sheets 1
through 4) show hover ceiling and the torque required (1) Enter chart at appropriate pressure altitude.
to hover respectively at various altitudes, ambient
temperatures, gross weights, and skid heights. (2) Move right to FAT.
Maximum skid height for hover can also be obtained by
(3) Move down to gross weight.
using the torque available (fig. 7-11). The directional
control capability is adequate to 35 knots for all (4) Move left to intersection with maximum mast
azimuths. torque available obtained from figure 7-11.
(5) Read predicted maximum skid height. The
7-36. USE OF CHART. height is the maximum hover height.
a. The primary use of the charts is illustrated by the
examples. In general, to determine the hover ceiling or 7-37. CONDITIONS.
the torque required to hover, it is necessary to know
the pressure altitude, temperature, gross weight, and The hover charts are based upon clam wind conditions,
the desired skid height. a level ground surface, and the use of 100 percent
rotor rpm. Controllability during down wind hovering,
b. In addition to its primary use, the hover chart (fig. crosswinds, and rearward flight is adequate in wind
7-14) can also be used to determine the predicted conditions in accordance with para 5-12.
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Figure 7-12. Hover Ceiling Chart, 30 Minute Operation (Out of Ground Effect)(Sheet 1 of 2)
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Figure 7-12. Hover Ceiling Chart, 30 Minute Operation (3 Ft Skid Height)(Sheet 2 of 2)
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Figure 7-13. Hover Ceiling Chart, Continuous Operation (Out of Ground Effect)(Sheet 1 of 2)
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Figure 7-13. Hover Ceiling Chart, Continuous Operation (3 Ft Skid Height)(Sheet 2 of 2)
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Figure 7-14. Hover Power Required Chart (Out of Ground Effect)(Sheet 1 of 2)
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Figure 7-14. Hover Power Required Chart (3 Ft Skid Height)(Sheet 2 of 2)
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SECTION XI. CRUISE OH-58D (250-C30R/3)
7-38. DESCRIPTION. a. Airspeed. True and indicated airspeeds are
present at opposite sides of each chart. On any chart
The cruise charts (fig. 7-15, sheets 1 thru 23) show the indicated airspeed can be directly converted to true
mast torque and fuel flow required for level flight at airspeed (or vice versa) by reading directly across the
various pressure altitudes, airspeeds, and gross chart without regard for other chart information.
weights at 100% rpm. Actual mast torque required and Maximum permissible airspeed (Vne) limits appear as
fuel flow for hover and low speed flight conditions red lines on some charts. If no red line appears, Vne is
(speed less than 40 KTAS) will be slightly greater than above the limits of the chart.
that shown on the cruise charts. The hover power
required charts (fig. 7-14) should be used to determine
b. Mast Torque (%Q). Since pressure altitude and
mast torque required to hover.
temperature are fixed for each chart, mast torque
varies according gross weight and airspeed. For pilot
NOTE convenience, all power is presented in terms of mast
torque.
The cruise charts are basically arranged by
FAT groupings. Figure 7-15, sheets 1 thru c. Fuel Flow. Fuel flow scales are provided
23, are based upon operation with basic opposite the torque scales. On any chart, torque may
configuration. Each chart has a line that be converted directly to fuel flow without regard for
represents a 10 square foot equivalent flat other chart information. All fuel flows are presented for
p l a t e d r a g a r e a . T h i s a l l o w s q u i c k bleed air heater and anti-ice off. Add 2 percent fuel flow
determination of Delta %Q for other than (about 6 lb/hr) for heater on and increase fuel flow 3
basic configurations. precent (approximately 9 lb/hr) for anti-ice on. If both
are operating, add 5 percent fuel flow (about 15 lb/hr)
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OPERATOR’S MANUAL FOR ARMY OH-58D HELICOPTER 2(69)
