Altair Glide Computer and Navigation System User Manual Page 57
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5 GLIDE COMPUTER
Speed to fly with risk
The speed to fly system can be compensated for risk, in which the MacCready setting used for
calculating the speed to fly (in both Block or Dolphin modes) is reduced as the glider gets low. This
feature performs automatically what many pilots use to do manually. The theory governing how this
is implemented in XCSoar is based loosely on the paper by John Cochrane, “MacCready Theory
with Uncertain Lift and Limited Altitude” Technical Soaring 23 (3) (July 1999) 88-96.
A configuration parameter γ (‘STF risk factor’, in the configuration settings under page ‘Glide Com-
puter’) controls how the risk Mc value is calculated. The γ factor determines the fraction of the
current MacCready setting as a function of the height fraction. The height fraction used in this
calculation is the ratio of the height above the break-off height above terrain (h) to the height of the
maximum climb above the break-off height above terrain (h
top
).
For the default value, γ = 0.0, there is no compensation – the risk Mc is the same as the Mc setting.
For γ = 1.0, the risk Mc is scaled linearly with the height fraction h/h
top
. For intermediate values
of γ, the risk Mc varies smoothly with the height fraction, such that the risk Mc is small only when
low.
Low values of γ are best when pilots do not want to slow down as they get low (but risk out-landing);
high values of γ can be used for very cautious pilots but will result in lower average speeds.
A value of γ = 0.3 is recommended.
5.6 Safety heights
Three safety heights are defined to provide a degree of safety margin in glide computer calcula-
tions.
XCSoar Manual (Altair version) • XCSoar-A-EN 50
- Manual (Altair version) 1
- Revision history 3
- Warnings and precautions 3
- Legal notices 3
- Contents 4
- • XCSoar-A-EN iv 5
- • XCSoar-A-EN vi 7
- 1 Introduction 8
- Start-up and user profiles 9
- Splash screen 9
- 1.4 Through-life support 10
- 1.5 Using XCSoar safely 11
- 2 User Interface 12
- 2.1 Button labels and menus 13
- 2.1.1 NAV menu 14
- 2.1.2 DISP menu 15
- 2.1.3 Pan mode 15
- 2.1.4 CONF menu 16
- 2.1.5 INFO Menu 16
- Default buttons 17
- Dynamic menu labels 17
- 2.2 InfoBoxes 18
- 2.3 Dialog windows 18
- • XCSoar-A-EN 12 19
- 2.3.7 Screen Brightness 20
- 2.3.8 Setup MacCready 20
- 2.3.9 Basic Settings 20
- 2.3.10 Wind Settings 20
- • XCSoar-A-EN 14 21
- 2.4 Status messages 22
- 2.5 Status dialog 22
- Aircraft 23
- • XCSoar-A-EN 18 25
- 2.6 Text entry 26
- 2.7 Sounds 27
- 2.8 Screen 27
- 2.9 Help system 27
- 3 Display Elements 28
- 3.3 Glider symbol 29
- 3.4 Trail 30
- 3.5 Glide range 31
- 3.6 Map elements 31
- Waypoints 32
- Terrain and topology 32
- 3.7 Markers 33
- 3.8 Active task elements 33
- 3.9 Thermal profile 34
- 3.10 Other 34
- GPS not connected 35
- GPS waiting for fix 35
- Final glide 35
- 4 Cross Country Tasks 36
- • XCSoar-A-EN 30 37
- 4.2 Task Editor 38
- • Save only Only save task 39
- • Task type Standard or AAT 40
- • Distance Task distance 40
- • XCSoar-A-EN 34 41
- Page: Waypoints 42
- • XCSoar-A-EN 36 43
- Page: Rules 44
- 4.3 Task calculator 45
- 4.4 Waypoint Browser 46
- 4.5 Waypoint Info 47
- −100%, the target is located 48
- 4.7 OnLine Contest 49
- 4.8 Logger 50
- Setup Logger 51
- 5 Glide Computer 52
- 5.2 MacCready settings 53
- 5.3 Glide polar 54
- 5.4 Basic settings 55
- 5.5 Speed to fly 56
- 5.6 Safety heights 57
- = 0), adjusted for 58
- 5.7 Final glide calculator 59
- +/− 500 meters 60
- 5.9 Task speed estimation 61
- 5.10 Optimal cruise track 62
- Analysis Show 63
- 5.12 Flight notifications 64
- 5.13 Sunlight and time 64
- 6 Atmosphere and Instruments 65
- 6.2 Air data inputs 66
- 6.3 Wind display 66
- 6.4 Wind estimation 66
- 6.5 Wind settings dialog 67
- 6.6 Thermal locator 68
- 6.7 Convection forecast 69
- • XCSoar-A-EN 64 71
- 7.1 Airspace display 72
- 7.2 Incursion events 73
- 7.3 Airspace warning levels 73
- 7.4 Airspace warning dialog 74
- 7.6 Airspace Info dialog 75
- 7.7 Airspace Browser dialog 76
- • XCSoar-A-EN 70 77
- 7.8 Analysis dialog: Airspace 78
- 7.9 FLARM traffic display 79
- • Green for level 0 80
- • Yellow for level 1 80
- • Red for level 2 and 3 80
- 7.10 Team flying 81
- 8 Avionics and Airframe 82
- 8.3 Switch Status 83
- 8.5 Supported variometers 83
- 8.6 Other avionics devices 84
- 8.7 Slave mode 84
- 9 Quickstart 85
- 9.2 FAI Task 86
- 9.3 FAI Task, Manual Start 87
- 9.4 AAT Task, Manual Arm 87
- In-flight 88
- After landing 89
- Prior to takeoff 90
- 10 InfoBox Reference 91
- 10.3 Glide ratio 92
- 10.4 Variometer 93
- 10.5 Atmosphere 94
- 10.6 MacCready 94
- 10.7 Navigation 95
- 10.8 Waypoint 97
- 10.9 Team code 98
- 11 Configuration 99
- Fail-safe 100
- 11.1 Site 101
- 11.2 Airspace 102
- • XCSoar-A-EN 96 103
- 11.3 Map Display 104
- • XCSoar-A-EN 98 105
- 11.4 Terrain display 106
- Colour schemes 107
- 11.5 Glide computer 108
- • XCSoar-A-EN 102 109
- 11.6 Safety factors 110
- 11.7 Polar 111
- 11.8 Devices 112
- 11.9 Units 113
- 11.10 Interface 114
- 11.11 Appearance 115
- • XCSoar-A-EN 116
- 11.12 InfoBox 117
- 12 Data Files 118
- 12.5 Airspace 119
- 12.6 Map 119
- 12.7 Airfield details 119
- 12.8 Glide polar 120
- *Speed2, Sink2, Speed3, Sink3 121
- • XCSoar-A-EN 116 123
- 12.9 Profiles 125
- 12.10 Checklist 125
- 12.11 Tasks 125
- 12.12 Flight logs 126
- 12.13 Input events 126
- 12.14 Language 126
- 12.15 Status 127
- 12.16 FLARM Identification file 127
- 12.17 Dialog files 127
- 13 About XCSoar 128
- 13.3 Open source philosophy 129
- 13.4 Development process 129
- 13.5 User base 130
- 13.6 Credits 130
- • XCSoar-A-EN 124 131
- A GNU General Public License 132
- • XCSoar-A-EN 126 133
- • XCSoar-A-EN 128 135
- No warranty 136
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