Re: YASim prop discing and turboprop engine

Berndt, Jon S wrote:

> I don't think anyone has tried this with JSBSim, yet. I've been looking
> into this lately, and have been writing an extensive paper on modeling
> aircraft with JSBSim. I _believe_ that prop effects on the wing can be
> modeled using the newest version of JSBSim-ML (JSBSim Markup Language),
> v2.0, due to the inclusion of function specifications. The idea would be
> to create both a function for a lift delta due to prop wash for each
> engine, and also a function for roll moment delta due to prop wash for
> each engine.

I had a stab at it once with the DHC6 but I needed a per engine thrust 
coefficient which wasn't available a year ago. You might want to 
consider using that one instead since a lot of data is available for it 
(and used in the configuration file), including an all ice covered 
configuration from LaRCsim/UIUC.

 From the old file:

<AXIS NAME="PITCH">
     <!-- AIAA -->
     <!-- COEFFICIENT NAME="DCmTr" TYPE="TABLE">
        Pitching_moment_due_to_right_engine_thrust
        22 2
        aero/alpha-rad
        fcs/flap-pos-deg
 
aero/qbar-psf|metrics/Sw-sqft|metrics/cbarw-ft|propulsion/c-thrust[0]
                 0.0    40.0
       -0.3491   0.003   0.000
       -0.2618   0.003   0.077
       -0.1745   0.013   0.128
       -0.1396   0.018   0.122
       -0.1047   0.029   0.117
       -0.0698   0.061   0.109
       -0.0349   0.059   0.123
       0.0000    0.072   0.144
       0.0349    0.085   0.192
       0.0698    0.094   0.320
       0.1047    0.128   0.448
       0.1396    0.189   0.504
       0.1745    0.203   0.432
       0.2094    0.224   0.376
       0.2443    0.261   0.192
       0.2793    0.291   0.000
       0.3142    0.269   0.000
       0.3491    0.234   0.000
       0.4363    0.000   0.000
       0.5236    0.000   0.000
       0.6109    0.000   0.000
       0.6981    0.000   0.000
     </COEFFICIENT -->

Erik

-- 
http://www.ehtw.info (Dutch)	Future of Enschede Airport Twente
http://www.ehofman.com/fgfs	FlightGear Flight Simulator
http://www.cafepress.com/fgfs_flightsim	 FlightGear Art


-------------------------------------------------------
This SF.Net email is sponsored by xPML, a groundbreaking scripting language
that extends applications into web and mobile media. Attend the live webcast
and join the prime developer group breaking into this new coding territory!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642