On Sun, 2009-11-22 at 16:06 -0600, James Turner wrote:
> Update of /var/cvs/FlightGear-0.9/data/Aircraft/c172p/Nasal
> In directory baron.flightgear.org:/tmp/cvs-serv24918/Nasal
>
> Modified Files:
> action-sim.nas
> Log Message:
> Dave Perry:
>
> This patch adds main gear rotations about the fuselage attach points
> that keep the wheels in contact with the ground as the compression
> increases and decreases. I also rotated the main fairings and wheels
> 4 degrees so the wheel axles are horizontal sitting on the ground.
> The left and right main gear struts, wheels, and fairings were
> adjusted to be mirrored (symetric) in the c172p.ac. I also increased
> the rpm boundary between the Propeller and Propeller.slow selects.
>
>
> Index: action-sim.nas
> ===================================================================
> RCS file: /var/cvs/FlightGear-0.9/data/Aircraft/c172p/Nasal/action-sim.nas,v
> retrieving revision 1.1
> retrieving revision 1.2
> diff -u -r1.1 -r1.2
> --- action-sim.nas 18 Nov 2009 20:36:13 -0000 1.1
> +++ action-sim.nas 22 Nov 2009 22:06:31 -0000 1.2
> @@ -43,6 +49,25 @@
>
> var update_actions = func {
>
> +# Compute compression induced main gear rotations
> +#
> +# constants
> + var R_m = 0.919679;
> + var h0 = 0.63872;
> + var theta0_rad = 0.803068;
> + var radTOdeg = 57.295779;
> +
> +# Right main
> + var delta_h = dhR_ft.getValue()*12/39.4;
> + var right_alpha_deg = ( math.acos( (h0 - delta_h)/R_m ) - theta0_rad
> )*57.295779;
> +
> +# Left main
> + var delta_h = dhL_ft.getValue()*12/39.4;
> + var left_alpha_deg = ( math.acos( (h0 - delta_h)/R_m ) - theta0_rad
> )*57.295779;
> +
> +
> +
> + # outputs
> if ( navLights.getValue() ) {
> instrumentLightFactor.setDoubleValue(1.0);
> # Used double in case one wants to later add the ability to dim the
> instrument lights
The relationship between feet and meters is exactly 0.3048 feet per
meter. Your conversion value of 12/39.4 is approximately 0.30456... It
would be better to do:
# constants
...
var radTOdeg = 57.295779;
var ftTOmeter = 0.3048;
...
# Right main
var delta_h = dhR_ft.getValue()*ftTOmeter;
var right_alpha_deg = ( math.acos( (h0 - delta_h)/R_m ) - theta0_rad
)*radTOdeg;
# Left main
var delta_h = dhL_ft.getValue()*ftTOmeter;
var left_alpha_deg = ( math.acos( (h0 - delta_h)/R_m ) - theta0_rad
)*radTOdeg;
This is more exact and also avoids two divisions per frame.
Thanks,
Ron
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