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 ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel