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塞斯纳172飞行员操作手册 Cessna 172 PILOT'S OPERATING HANDBOOK(43)

时间:2011-12-29 11:03来源:蓝天飞行翻译 作者:航空 点击:

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, CESSNA SECTION 5
MODEL 172N PERFORMANCE
INTRODUCTION
Performance data charts on the following pages are presented so that you may know what to expect from the airplane under various conditions, and also, to facilitate the planning of flights in detail and with reasonable accuracy. The data in the charts has been computed from actual flight tests with the airplane and engine in good condition and using average piloting techniques.
It should be noted that the performance information presented in the range and endurance profile charts allows for 45 minutes reserve fuel based on 45% power. Fuel flow data for cruise is based on the recommended lean mixture setting. Some indeterminate variables such as mixture leaning technique, fuel metering characteristics, engine and propeller condition, and air turbulence may account for variations of 10% or more in range and endurance. Therefore, it is important to utilize all available information to estimate the fuel required for the particular flight.
USE OF PERFORMANCE CHARTS
Performance data is presented in tabular or graphical form to illus¬trate the effect of different variables. Sufficiently detailed information is provided in the tables so that conservative values can be selected and used to determine the particular performance figure with reasonable accuracy.
SAMPLE PROBLEM
The following sample flight problem utilizes information from the various charts to determine the predicted performance data for a typical flight. The following information is known:
AIRPLANE CONFIGURATION Takeoff weight Usable fuel
TAKEOFF CONDITIONS
Field pressure altitude Temperature
Wind component along runway Field length 2250 Pounds 40 Gallons
1500 Feet
28°C (16°C above standard) 12 Knot Headwind
3500 Feet
 
CRUISE
The cruising altitude should be selected based on a consideration of trip length, winds aloft, and the airplane's performance. A typical 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
 
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