2-3

 

Range of vehicle attributes (from conventional mission to special applications),

 

25

2-4

 

UAV internal communications system,

 

28

2-5

 

Notional UAV external communications system,

 

29

2-6

 

Human performance measures,

 

32

3-1

 

Variation of Reynolds number with altitude,

 

41

3-2

 

Maximum lift-to-drag ratio vs. Reynolds number showing influence of aspect ratio and laminar flow,

 

41

3-3

 

Unconventional designs with challenging configuration aerodynamics,

 

46

5-1

 

Propulsion system weight (engine plus fuel) as a percentage of aircraft takeoff gross weight,

 

60

5-2

 

Characteristics of propulsion and power systems for UAVs,

 

61

5-3

 

Typical power requirements for propeller-powered MAVs,

 

64

5-4

 

System mass vs. energy for several advanced, small energy systems,

 

65

5-5

 

Typical engine specifications for externally applied forces on takeoff, landing, and maneuvers,

 

68

6-1

 

Options for a prime power source for a range of average power levels and flight durations,

 

73

6-2

 

Schematic representation of overall aircraft power system,

 

73

6-3

 

Comparisons of specific power of space-based technologies with a broad range of power outputs,

 

76

6-4

 

Electrical power system and primary subsystems,

 

77

7-1

 

Integrated UAV control scenario,

 

83

7-2

 

Functional hierarchy of vehicle control systems,

 

84

7-3

 

Comparison of (a) traditional engineering design process with (b) virtual engineering design process,

 

88



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