120 lines
3 KiB
Text
120 lines
3 KiB
Text
# $Id$
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#
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# Nasal script to print errors to the screen when aircraft exceed design limits:
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# - extending flaps above maximum flap extension speed(s)
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# - extending gear above maximum gear extension speed
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# - exceeding Vna
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# - exceeding structural G limits
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#
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# To use, include this .nas file and define one or more of
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# limits/max-flap-extension-speed/speed
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# limits/max-flap-extension-speed/flaps
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# limits/vne
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# limits/max-gear-extension-speed
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# limits/max-positive-g
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# limits/max-negative-g (must be defined in max-positive-g defined)
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#
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# You can define multiple max-flap-extension-speed entries for max extension
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# speeds for different flap settings.
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var checkFlaps = func(n) {
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var flapsetting = n.getValue();
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if (flapsetting == 0)
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return;
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var airspeed = getprop("velocities/airspeed-kt");
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var ltext = "";
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var limits = props.globals.getNode("limits");
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if ((limits != nil) and (limits.getChildren("max-flap-extension-speed") != nil))
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{
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var children = limits.getChildren("max-flap-extension-speed");
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foreach(var c; children)
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{
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if ((c.getChild("flaps") != nil) and
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(c.getChild("speed") != nil) )
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{
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var flaps = c.getChild("flaps").getValue();
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var speed = c.getChild("speed").getValue();
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if ((flaps != nil) and
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(speed != nil) and
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(flapsetting > flaps) and
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(airspeed > speed) )
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{
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ltext = "Flaps extended above maximum flap extension speed!";
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}
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}
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}
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if (ltext != "")
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{
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screen.log.write(ltext);
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}
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}
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}
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var checkGear = func(n) {
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if (!n.getValue())
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return;
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var airspeed = getprop("velocities/airspeed-kt");
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var max_gear = getprop("limits/max-gear-extension-speed");
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if ((max_gear != nil) and (airspeed > max_gear))
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{
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screen.log.write("Gear extended above maximum extension speed!");
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}
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}
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# Set the listeners
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setlistener("controls/flight/flaps", checkFlaps);
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setlistener("controls/gear/gear-down", checkGear);
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var checkGandVNE = func {
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if (getprop("/sim/freeze/replay-state"))
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return;
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var g = getprop("/accelerations/pilot-gdamped") or 1;
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var max_positive = getprop("limits/max-positive-g");
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var max_negative = getprop("limits/max-negative-g");
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var msg = "";
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if ((max_positive != nil) and (g > max_positive))
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{
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msg = "Airframe structural positive-g load limit exceeded!";
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}
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if ((max_negative != nil) and (g < max_negative))
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{
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msg = "Airframe structural negative-g load limit exceeded!";
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}
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# Now check VNE
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var airspeed = getprop("velocities/airspeed-kt");
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var vne = getprop("limits/vne");
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if ((airspeed != nil) and (vne != nil) and (airspeed > vne))
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{
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msg = "Airspeed exceeds Vne!";
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}
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if (msg != "")
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{
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# If we have a message, display it, but don't bother checking for
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# any other errors for 10 seconds. Otherwise we're likely to get
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# repeated messages.
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screen.log.write(msg);
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settimer(checkGandVNE, 10);
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}
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else
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{
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settimer(checkGandVNE, 1);
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}
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}
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checkGandVNE();
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