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7-5
TM 1-1520-248-10
Figure 7-2. Maximum Torque Available Chart (30 Minute Operation) (Sheet 2 of 3)
7-6
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Figure 7-2. Maximum Torque Available Chart (Continuous Operation) (Sheet 3 of 3)
7-7
TM 1-1520-248-10
SECTION IV. HOVER OH-58D (T703-AD-700A/250-C30R)
7-14. DESCRIPTION. maximum hover height. To determine maximum hover
height, proceed as follows:
The hover charts (fig. 7-3 and 7-4) show hover ceiling
and the torque required to hover respectively at various (1) Enter chart at appropriate pressure altitude.
altitudes, ambient temperatures, gross weights, and
(2) Move right to FAT.
skid heights. Maximum skid height for hover can also
be obtained by using the torque available (fig. 7-2). The (3) Move down to gross weight.
directional control capability is adequate to 35 knots for
all azimuths. (4) Move left to intersection with maximum mast
torque available obtained from figure 7-2.
7-15. USE OF CHART. (5) Read predicted maximum skid height. The
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
the torque required to hover, it is necessary to know 7-16. CONDITIONS.
the pressure altitude, temperature, gross weight, and
the desired skid height. The hover charts are based upon calm wind conditions,
a level ground surface, and the use of 100 percent
rotor rpm. Controllability during downwind hovering,
b. In addition to its primary use, the hover chart, crosswinds, and rearward flight is adequate in wind
(fig. 7-4) can also be used to determine the predicted conditions in accordance with para 5-12.
7-8
TM 1-1520-248-10
Figure 7-3. Hover Ceiling Charts (5 Minute Operation)(Sheet 1 of 2)
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Figure 7-3. Hover Ceiling Charts (30 Minute Operation)(Sheet 2 of 2)
7-10
TM 1-1520-248-10
Figure 7-4. Hover Power Required Chart
7-11
TM 1-1520-248-10
SECTION V. CRUISE OH-58D (T703-AD-700A/250-C30R)
7-17. DESCRIPTION. a. Airspeed. True and indicated airspeeds are
present at opposite sides of each chart. On any chart
The cruise charts (fig. 7-5, sheets 1 through 23) show indicated airspeed can be directly converted to true
the 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)
(speed less than 40 KTAS) will be slightly greater than is above the limits of the chart.
that shown on the cruise charts. The hover power
required charts (fig. 7-4) 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 to 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 7-5, sheets 1 thru 23, c. Fuel Flow. Fuel flow scales are provided
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 ten 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. percent (approximately 9 lb/hr) for anti-ice on. If both
are operating, add 5 percent fuel flow (about 15 lb/hr)
to chart values.
7-18. USE OF CHARTS.
The primary use of the charts is illustrated by the d. Maximum Range. The maximum range lines
example provided. The first step for chart use is to indicate the combinations of weight and airspeed that
select the proper chart, based upon the pressure will produce the greatest flight range per gallon of fuel
altitude and anticipated free air temperature. Normally, under zero wind conditions. When a maximum range
sufficient accuracy can be obtained by selecting the condition does not appear on a chart, it is because the
chart nearest to the planned cruising altitude and FAT, maximum range speed is beyond the maximum
or the next higher altitude. If greater accuracy is permissible speed (Vne); in such cases, use cruising
required, interpolation between altitudes and/or speed Vne to obtain maximum range.
　
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