Hello Olivier, Olivier Faivre schrieb am 25.06.2009 20:52: > Hello guys, > ... > Actually, the wing is done with only one piece, 7° dihedral, no twist. > Can I use the "mstab" command to specify the outer wing and the > regular "wing" command for the inner one ? yes > In the readme file, I read this for mstab : these surfaces are not > involved with the solver computation these surfaces are not involved > with the solver computation... > > I'm not sure to well understand. > if you define a yasim FDM you have to define two configurations with different airspeed, typ. cruise and approach. Yasim modifies lift and drag factors and the incidence of the wing to meet these configurations. Therefore the incidence of a wing will be modified by the yasim solver (only once - when the model is loaded) while the incidence of a mstab is unchanged. > > Second question about readme : > > I read this in the fuselage section: > Factors for the generated drag in the fuselages "local coordinate system" > with x pointing from end to front, z perpendicular to x with y=0 in the > aircraft coordinate system. > > > E.g. for a fuselage of a height of 2 times the width you can define cy=2 and > (due to the doubled front surface) cx=2 > > Again, I' don't understand the meaning of CX=2 and CY=2... a fuselages generates drag. In former time Yasim assumed fuselages to have equal width and height. This was changed by the addition of cx, cy,... If you have a very narrow fuselage the drag in z-direction (vertical) should be smaller than in y-direction. Lets think of a fuselage 1m in width and 4m in height: For this case you can define the width as the mean value of width in z- and y-direction (2m) and modify the drag value in z-dircection by a factor of .5 (cz=0.5) and in y-direction by a factor of 2 (cy=2). But I think for most aircrafts these effects are small. These factors were added for fixing problems with helicopters, where the fuselage is in the downwind of the main rotor. > > > > Thanks for your help ;-) > welcome > Olivier Faivre > > > From France Best regards, Maik
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