From: Ralf G. <rge...@kn...> - 2007-07-21 16:46:33
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Hi, IIRC you can specify functions (e.g. tables) in JSBSim which are in a first step completely unrelated to lift, drag, sideforce or any of the moments. The files output by DATCOM+ do this for the ground effect by establishing a table of additional coefficients based on the ratio of height AGL and span. These coefficients are then multiplied on the basic lift and drag. Simply place a function outside any of the axis definitions and then use it as a property in your axis functions. An example can be seen in the Seneca-model by Torsten Dreyer: http://cvs.flightgear.org/cgi-bin/viewvc/viewvc.cgi/data/Aircraft/SenecaII/SenecaII-jsbsim.xml?content-type=text%2Fplain&view=co Search for "ground-effect-factor-lift". You could use this to describe the downwash based on the current AoA and whatever is needed in addition. Cheers, Ralf |