I've been playing around with the c172p, trying to make it give me more feedback when I overstress the structure. I added some limits (with the script in Aircraft/Generic), which helps. I just managed to get it to creak when I go past load limits.
I remember loving the creaking when doing aerobatics in Flight Unlimited long ago and wanted to have something like that in FG.
First, I included the limits.nas script by adding this to the end of the <nasal> block at the end of c172p-set.xml:
<failures>
<file>Aircraft/Generic/limits.nas</file>
</failures>
And added this new block:
<limits>
<max-flap-extension-speed>
<flaps>0.3</flaps>
<speed>110</speed>
</max-flap-extension-speed>
<max-flap-extension-speed>
<flaps>0.6</flaps>
<speed>85</speed>
</max-flap-extension-speed>
<max-flap-extension-speed>
<flaps>0.9</flaps>
<speed>85</speed>
</max-flap-extension-speed>
<!-- Skyhawk is in Utility Class, hence max load factors -->
<max-positive-g>4.4</max-positive-g>
<max-negative-g>-1.76</max-negative-g>
<vne>158</vne>
</limits>
I'm open to critique for those values.
I added this to c172-sound.xml:
<overstress>
<name>creak</name>
<path>Sounds/wingscreak.wav</path>
<condition>
<or>
<less-than>
<property>/accelerations/pilot/z-accel-fps_sec</property>
<value>-140.8</value>
</less-than>
<greater-than>
<property>/accelerations/pilot/z-accel-fps_sec</property>
<value>56.32</value>
</greater-than>
</or>
</condition>
<volume>
<offset>0.8</offset>
</volume>
</overstress>
I can share the WAV file, of course. If you have better, please do share!
Very cool, now it creaks when I dive and pull up hard. :)
A few questions:
1. Is there a better way to compare this against the G limits I set in the <limits> block without hard coding the accelerations in feet per sec^2 ? I'd rather not put the values in there, but use the configurable limits.
2. I think they should actually creak before you hit the max G's. Good as a warning. My question is: Around where should it start creaking (roughly) relative to the max G limits?
I'd also love to do something with landing gear stresses in the same direction, including lateral stresses. If anyone has any ideas there, I'd love to hear them. I can't find anything about max landing gear stresses anywhere.
As an aside, I've got the logging set up to give me gear compression/forces and other stats, which I'm graphing in Octave (like Matlab) to critique my take-offs and landings. Oh what fun is FlightGear! :)
Thanks,
Mike.
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