61 lines
1.8 KiB
Text
61 lines
1.8 KiB
Text
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I will explain assumptions I have made:
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All global vars, such as Alpha, Alpha_dot, Density, Altitude, so on,
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have correct values in the moment cherokee functions are called.
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Body coord system is defined as follows:
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X_body -> from cg to nose
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Y_body -> along right wing
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Z_body -> "down" (to make right coord system)
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All forces and moments act in CG.
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If strange behaviour is experienced, (like impossibility of level
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flight), it is probably misused coord system. Let me know and fix
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the error.
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All controls are in the range [-1.0, 1.0] If it is not so, values in
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cherokee_aero.c on lines 119-121 should be changed acordingly. If
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commands appear to be oposite, this is the place to change sign
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convention.
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Engine controls are in range [0.0, 1.0] (I found out later that lower
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bound is -0.2, so I added fabs(). I know, it is dirty and phisiclly
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wrong, but it was simply the fastest way to deal with it).
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All initialization files are *.ic:
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mass = 74.53 slugs
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Ixx = 1070 slugs
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Iyy = 1249 slugs
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Izz = 2312 slugs
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Ixz = 0.0 slugs
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above changes are writen in *.ic included in cherokee.zip. However,
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other data in *.ic files are not changed in any way.
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aditional properties: (if needed)
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S = 157.5 ft^2 -> wing area
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b = 30.0 ft -> wing span
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Ar = 5.71 -> aspect ratio
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c = 5.25 ft -> midspan chord
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Once more: Source are TOTALY UNCHECKED. I hope it will work, but I do not
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dare to claim that ewerything will work first time you compile it.
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Good Luck!
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Gordan
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gsikic@public.srce.hr
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PS
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Work to be done (for myself):
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Landing gear (it is just navion_gear.c copied for now, these are similar
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class of aircraft, so it should work),
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Alpha_max is still undone,
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Spin (if I find any references concerning simulating spin),
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Efect of ground,
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Flaps,
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.......
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