Fuel Required; Cruise - Cessna 182Q 1979 Pilot Operating Handbook

CESSNA
MODEL 182Q
CRUISE
SECTION 5
PERFORMANCE
The cruising altitude should be selected based on a consideration of
trip length, winds aloft, and the airplane's performance. A cruising
altitude and the expected wind enroute have been given for this sample
problem. However, the power setting selection for cruise must be deter-
mined based on several considerations. These include the cruise perfor-
mance characteristics presented in figure 5-7, the range profile chart
presented in figure 5-8, and the endurance profile chart presented in figure
5-9.
The relationship between power and range is illustrated by the range
profile chart. Considerable fuel savings and longer range result when
lower power settings are used.
The range profile chart indicates that use of 65% power at 7500 feet
yields a predicted range of 952 nautical miles with no wind. The endurance
profile chart shows a corresponding 7.1 hours. Using this information, the
estimated distance can be determined for the expected 10 knot headwind at
7500 feet as follows:
Range, zero wind
Decrease in range due to wind
(7.1 hours
x
10 knot headwind)
Corrected range
952
71
88i
Nautical Miles
This indicates that the trip can be made without a fuel stop using
approximately 65% power.
The cruise performance chart for 8,000 feet pressure altitude is entered
using 20°C above standard temperature. These values most nearly corres-
pond to the planned altitude and expected temperature conditions. The
power setting chosen is 2200 RPM and 21 inches of manifold pressure,
which results in the following:
Power
True airspeed
Cruise fuel flow
65%
137 Knots
11.0 GPH
The power computer may be used to determine power and fuel consump-
tion more accurately during the flight.
FUEL REQUIRED
The total fuel requirement for the flight may be estimated using the
performance information in figures 5-6 and 5-7. For this sample problem,
figure 5-6 shows that a normal climb from 2000 feet to 8000 feet requires 2.8
1 October 1978
5-5