Joacim Persson schrieb: > On Sun, 2 Jul 2006, Maik Justus wrote: > > >> the helicopter simulation as it is in cvs has the bug, that any kind of >> surfaces, stabs, fuselages have no aerodynamical effect. >> > > That bugfix had a huge impact on the chinook. I still get a negative yaw > moment from the both rotors (most of the time), but I guess you have more > stuff coming in due time. (I simply turned off torque calculations. > Doesn't matter on that model anyway.) > If you put the stick forward or backward there should be a yaw effect. With the bugfix you have to cancel the torque generated by fuselage and airspeed by putting the stick backward. This could be the cause for the yaw. (Or dou you get the yaw moment with torque off?) > But I noticed something else now. Maybe it's been there all the time and I > just never saw it: > > Solution results: Iterations: 0 > > CG: -8.331, -0.003, 3.088 > ^^^^^ > (Datum used has the Z- and Y-axii along the mid of the fuselage.) > > The solver places the CG 3 meters up! (I've only been using a small > ballast-statement at the stern to trim the longitudal CG right, plus the > two engines.) This lands somewhere at the height of the rotors (fwd Z: 2.6, > aft: 3.99). (They're not THAT heavy ;) This of course creates some > interesting stability problems when not flying perfectly coordinated... > Imagine a sailboat with the whole ballast at the top of the mast. =) > > Yes, the high CG would intensify the effect. Maik
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