Jon S Berndt wrote:
3) This one just occurred to me: I wonder if the control inputs from stick and rudder are linear? Or, are they perhaps graduated?
The controller devices can be all over the place, but as I mentioned, I'm trying to factor that out -- for example, I'm looking at how the aircraft reacts to a perturbance rather than how much stick it takes to bank, etc. Tony mentioned phugoids and Dutch roll, both of which I've been watching. I also tested both with a spring-loaded joystick and with the mouse (which has no autocentering action at all).
I think you might have been onto something with the moments of inertia: our current IXX, IYY, and IZZ apply to a Cessna 182, which is a heavier plane than a 172, though with the same wing area and wingspan. Here are the 182 numbers we're currently using:
IXX = 948 IYY = 1346 IZZ = 1967
What numbers do you have for the Cherokee?
All the best,
David
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