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Ground proximity warning system: Difference between revisions
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Ground proximity warning system (view source)
Revision as of 22:41, 1 December 2010
, 1 December 2010→Radio Altitude Input Select
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Select radio altimeter input source. | Select radio altimeter input source. | ||
''' | * '''2 (default)''': Altitude source is property "/position/altitude-agl-ft". Works for all FDMs - but this is <i>not precise enough to drive useful 20ft and 10ft callouts</i> (see below). | ||
* ''' | * 3: Altitude source is "/position/gear-agl-ft". Very precise altitude of gear-above-ground - but only available for planes with YASim FDM (so far). | ||
* 4: Altitude source is "/instrumentation/radar-altimeter/radar-altitude-ft". A radar altimeter instrument must be installed. | |||
'''Hint''': Most simulator altitude properties refer to the plane's center (of gravity) - but not to the altitude of the main gear. A radar altimeter on a real plane is always calibrated to the gear, hence provides precise information (yes, only within a certain degree of the angle of attack...). | |||
Without a precise altitude source the final callouts before touch down, especially 20ft and 10ft, make no sense or may not even work - very annoying, since most aircraft require a final nose up flare at about 20ft. So precise callouts are very welcome. | |||
Using a radar altimeter instrument is recommended since this is most realistic - and it can (and should) be calibrated to the main gear. See ...(TODO)... for a configuration example. | |||
'''Note''': This configuration category is supported beginning with FlightGear 2.2. | |||
=== Navigation Input Select === | === Navigation Input Select === | ||