I am forwarding this to home so I can remember to 
investigate this. Is it safe to download the entire set of 
fgfs files from CVS, yet?? :-)

Jon



On Tue, 17 Sep 2002 16:05:15 -0500
  "Curtis L. Olson" <[EMAIL PROTECTED]> wrote:
>David Megginson writes:
>> Perhaps you could explain the problem in more detail: we 
>>get a lot of
>> "why does the plane pull to the left?" questions from 
>>people who don't
>> know about adverse yaw, so we usually assume that's the 
>>problem.
>> 
>> First, you mentioned that the plane veers to the left 
>>not only during
>> power climb but during initial rollout.  How big is the 
>>veer?  Does it
>> just drift off the runway slowly (as in real life), or 
>>does it turn
>> sharply?
>> 
>> If the turn is sudden, then you can test the problem by 
>>unplugging all
>> joysticks, rudder pedals, yokes, and other controllers, 
>>then trying it
>> using only the keyboard (hold down Page Up to advance 
>>the throttle).
>> If the veer isn't as bad, then one of your controllers 
>>might be
>> miscalibrated.
>
>For what it's worth, with the default JSBSim C172 using 
>keyboard
>control (the assumption being there is no possible 
>joystick
>calibration issues) I observe the following.
>
>After giving full throttle, at the beginning of the roll 
>out, I'm
>forced to give full right rudder to keep the aircraft 
>rolling
>approximately straight, but as the speed begins to pick 
>up I can
>slowly back off the rudder.  By the time I'm doing 40-50 
>knots, I can
>roll straight with neutral rudder.
>
>This almost feels to me like the nose wheel is completely
>ineffective, even at low speeds, but I haven't 
>investigated closely.
>
>Regards,
>
>Curt.
>-- 
>Curtis Olson   IVLab / HumanFIRST Program 
>      FlightGear Project
>Twin Cities    [EMAIL PROTECTED] 
>                 [EMAIL PROTECTED]
>Minnesota      http://www.menet.umn.edu/~curt 
>  http://www.flightgear.org
>
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