I've just been reworking the FDM of my Colditz Escape Glider to get it
to work with 0.9.10 and the new JSBSim .xml format.
So far so good, but....
1) How do I get the 'autopilot' menu item to grey out and go away
please? I've tried studying the c172p and conclude that it does it by
specifying its own autopilot which automagically greys out the default
one. I don't want one at all. How to do that please?
2) If I dive the colditz glider vertically down it manages to hold this
vertical flight until it hits the ground. Two problems ...
2a) I reckon it ought to try and pull out of the dive as the lift over
the wings increases. I assume that the JSBsim applies a torque due to
wing lift about the claimed CG of the 'plane, and if so then I need to
have my CG behind the wing root somewhere. Presumably I've not got it
far enough behind. Does this sound like a likely cause of excessively
easy vertical dive? Needless to say, without a real Colditz Glider to
measure, I'm having to estimate the position of CG.
2b) The Colditz Glider in vertical dive mode (see above) manages to
achieve about mach 6 (:-)). I tried fiddling with "drag due to mach" in
the .xml file to try and limit the terminal velocity, but it doesn't
seem to do much. A human being in freefall manages about 120mph
(190km/h) apparently, and I'm not sure I'd expect a crude wood and
fabric airplane to do much more than that. What's the right way to model
drag due to velocity?
Thanks in advance for any clues.
Steve
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