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Rally Pilot Operating Handbook
Copyright 2008, Rally Aircraft
Revision 4.1
24
5.1 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 facili-
tate 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.
USE OF PERFORMANCE CHARTS
Performance data is presented in tabular form to illustrate the effect of different
variables. Conservative values can be selected and used to determine the particu-
lar performance figure with reasonable accuracy.
5.2 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 infor-
mation is known:
2.21 EXAMPLE:
Airplane configuration:
•
Takeoff weight .................. 1,320 lbs (MTOW)
•
Usable fuel ..................... 20 gal
Takeoff conditions:
•
Field pressure altitude ......... 1,500 ft
•
Temperature ..................... 82°F (61°F above standard)
•
Wind component along runway ..... 13 knot headwind
•
Field length .................... 1,400 ft
Cruise conditions:
•
Total distance .................. 400 nm
•
Pressure altitude ............... 5,500 ft
•
Temperature ..................... 68°F (61°F above standard)
•
Expected wind enroute ..... 10 knot headwind
Landing conditions:
•
Field pressure altitude ......... 2,000 ft
•
Temperature ..................... 77°F
•
Field length .................... 1,500 ft
5.22 TAKEOFF
The takeoff distance chart (Fig. 5-3) should be consulted keeping in mind that the
distances shown are based on normal takeoff technique. Conservative distances
can be established by reading the chart at the next higher value of altitude and
temperature. For example, in this particular sample problem, the takeoff distance
information presented for a pressure altitude of 2,000 ft and a temperature of 86°F
should be used and results in the following:
•
Ground roll ........................................... 550 ft