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add simple wind_speed_from() function, and Jean PELLOTIER's not-so-simple

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kias_to_ktas() function
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mfranz 2009-03-18 13:13:15 +00:00
parent 1b6b77d788
commit dafeb03bf1
1 changed files with 22 additions and 0 deletions
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22
Nasal/aircraft.nas
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@ -914,6 +914,28 @@ var teleport = func(airport = "", runway = "", lat = -9999, lon = -9999, alt = 0
# returns wind speed [kt] from given direction [deg]; useful for head-wind
#
var wind_speed_from = func(azimuth) {
var dir = (getprop("/environment/wind-from-heading-deg") - azimuth) * D2R;
return getprop("/environment/wind-speed-kt") * math.cos(dir);
}
# returns true airspeed for given indicated airspeed [kt] and altitude [ft]
#
var kias_to_ktas = func(kias, altitude) {
var seapress = getprop("/environment/pressure-sea-level-inhg");
var seatemp = getprop("/environment/temperature-sea-level-degc");
var coralt_ft = altitude * M2FT + (29.92 - seapress) * 910;
return kias * (1 + 0.00232848233 * (seatemp - 15))
* (1.0025 + coralt_ft * (0.0000153
- kias * (coralt_ft * 0.0000000000003 + 0.0000000045)
+ (0.0000119 * (math.exp(coralt_ft * 0.000016) - 1))));
}
# HUD control class to handle both HUD implementations
# ==============================================================================
#