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Aircraft speed: Difference between revisions
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'''Ground''' speed (GS) is the velocity with which the aircraft moves relative to a fixed point on the ground. One needs to know ground speed in order to see how long a flight from A to B actually takes. Nowadays GS can be directly measured using a GPS system, and some aircraft equipped with such a system have a groundspeed gauge. Without a GPS, GS has to be calculated from airspeed and the local wind pattern or estimated by measuring the time between passing two points on the ground with a known distance, but in Flightgear you can always cheat and get it from the property browser under <tt>velocities/groundspeed-kt</tt>. | '''Ground''' speed (GS) is the velocity with which the aircraft moves relative to a fixed point on the ground. One needs to know ground speed in order to see how long a flight from A to B actually takes. Nowadays GS can be directly measured using a GPS system, and some aircraft equipped with such a system have a groundspeed gauge. Without a GPS, GS has to be calculated from airspeed and the local wind pattern or estimated by measuring the time between passing two points on the ground with a known distance, but in Flightgear you can always cheat and get it from the property browser under <tt>velocities/groundspeed-kt</tt>. | ||
It is perhaps also worth noting that GS measures only the horizontal component of the aircraft velocity - in a steep dive, the aircraft can move very fast, but because the motion is chiefly vertical, the groundspeed can be very small at the same time. | It is perhaps also worth noting that GS measures only the horizontal component of the aircraft velocity - in a steep dive, the aircraft can move very fast, but because the motion is chiefly vertical, the groundspeed can be very small at the same time. This is where the GS differs from the ground speed of a car. | ||
=== True Airspeed === | === True Airspeed === | ||