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Starting in the Air: Difference between revisions
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To start FlightGear in the air, you need at a minimum to set the following: | To start FlightGear in the air, you need at a minimum to set the following: | ||
* the altitude in feet MSL, using the altitude option | * the [[altitude]] in feet [[MSL]], using the [[altitude]] option | ||
* the calibrated airspeed, using the vc option (or alternately, the Mach number, using the mach option) | * the [[calibrated airspeed]], using the vc option (or alternately, the [[Mach number]], using the mach option) | ||
You can also set the heading using the heading option, but note that the heading is in degrees true rather than degrees magnetic, so in some parts of North America it can be more than 30 degrees different than runway alignment. Here's a simple [[command line]] to start flying true north at 110 kcas (typical cruise speed for a [[Piper Cherokee Warrior II|Warrior]] or [[Cessna C172]]) at 5000 ft northbound: | You can also set the heading using the heading option, but note that the heading is in degrees true rather than degrees magnetic, so in some parts of North America it can be more than 30 degrees different than runway alignment. Here's a simple [[command line]] to start flying true north at 110 kcas (typical cruise speed for a [[Piper Cherokee Warrior II|Warrior]] or [[Cessna C172]]) at 5000 ft northbound: | ||
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fgfs --altitude=5000 --heading=0 --vc=110 | fgfs --altitude=5000 --heading=0 --vc=110 | ||
Often, you will want to start flying in a position relative to an airport, navaid, or intersection. In that case, you can specify the reference position using the normal airport, vor, ndb, or fix options. You then use offset-distance to specify your distance from the starting point (in statute miles, which needs to be fixed), and offset-azimuth to specify the bearing to the reference point (again, in degrees true). This command line starts at 5000 ft 5 statue miles to the east of the Oakland VOR: | Often, you will want to start flying in a position relative to an airport, navaid, or intersection. In that case, you can specify the reference position using the normal airport, vor, ndb, or fix options. You then use offset-distance to specify your distance from the starting point (in statute miles, which needs to be fixed), and offset-azimuth to specify the bearing to the reference point (again, in degrees true). This command line starts at 5000 ft 5 statue miles to the east of the Oakland [[VOR]]: | ||
fgfs --altitude=5000 --heading=270 --vc=110 --vor=OAK --offset-distance=5 --offset-azimuth=270 | fgfs --altitude=5000 --heading=270 --vc=110 --vor=OAK --offset-distance=5 --offset-azimuth=270 | ||