I noticed that all of the YASim models tended to nose down with
neutral elevator. I assumed that it was a W&B problem and tried
shifting weight all over the place in the J3 cub (and even moved the
wings around), but nothing fixed the problem.
In the end, I figured out that the YASim solver simply did not know
where to put the elevator for cruise. We know that the elevator is
normally near to a neutral position (or slightly forward) for light
aircraft, but YASim doesn't.
Originally, the YASim J3 Cub config file had this:
<cruise speed="64" alt="0">
<control-setting axis="/controls/throttle[0]" value="0.75"/>
<control-setting axis="/controls/mixture[0]" value="0.75"/>
</cruise>
I simply added the elevator axis (with a slight nose-down bias for
cruise), and it now glides just fine with neutral elevator:
<cruise speed="64" alt="0">
<control-setting axis="/controls/throttle[0]" value="0.75"/>
<control-setting axis="/controls/mixture[0]" value="0.75"/>
<control-setting axis="/controls/elevator" value="0.1"/>
</cruise>
I recommend that other people designing YASim flight models try
something similar.
All the best,
David
--
David Megginson, [EMAIL PROTECTED], http://www.megginson.com/
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