Re: [Jsbsim-devel] properties for lift, drag thrust, etc.

[Tony P. <ap...@ea...>]

On Sun, 2003-09-14 at 12:40, David Culp wrote:
> I've been testing the T-38 and have a sub-panel set up to display aerodynamic 
> properties while flying.  The thrust display looks correct, but the drag is 
> sometimes way off (often negative), so I'm looking at the wrong property.  
> Here is what I have now:
> 
> Thrust:  /fdm/jsbsim/forces/fbx-prop-lbs
> Drag:    /fdm/jsbsim/forces/fbx-aero-lbs
> Weight:  /fdm/jsbsim/inertia/weight-lbs
> Alpha:   /fdm/jsbsim/aero/alpha-wing-rad  ( /57.295779 )
> Lift:    /fdm/jsbsim/forces/fbz-aero-lbs

Look at the fw*-aero properties, fwx is the total drag and fwz the total
lift.  These are in wind axes (the axis system the coefficients are in),
not body so they can't be summed with the prop and inertial forces
directly.  The fb*-aero are the result of transforming the fw*
properties to body axes.

> 
> 
> Are there properties which better represent what I'm looking for?
> 
> Thanks,
> Dave
-- 
Tony Peden <ap...@ea...>