On 07/03/2007 02:45 PM, Berndt, Jon S wrote:
> A positive elevator angular deflection (about the +Y
> axis) makes the trailing edge of the elevator move down, resulting in a
> negative pitching moment.
>
> Likewise, a positive rotation of the rudder about the Z axis (positive
> downward, with Y positive out the right wing and X positive foward)
> results in the trailing edge moving left, resulting in a negative yawing
> moment.
You can't argue that FG does both of these things correctly in
accordance with that rule.
It follows one convention for yaw, and the opposite convention for
pitch. If you don't believe me, use the browse-internal-properties
popup, and check the properties against cockpit control deflections
and/or control surface deflections.
I try to align all my conventions with the _pilot's_ point of
view. The pilot is not looking at the rudder deflection. The
pilot thinks that a positive deflection of the cockpit yaw control
is whatever produces a positive yaw-wise motion of _the whole aircraft_.
You didn't write what you meant - that is, your statements (as written) were backwards for yaw and pitch. Instead of referring to rudder or elevator (physical aerosurface) deflection, you should have referred to pilot control stick/yoke inputs.
Jon
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