Note to all YASim aircraft authors: the first fix discussed below is correct and has to be applied, but will (or at least may) have the effect of modifying the solution results of all YASim aircraft (tails are likely to be more effective: that means aircraft will be more stable on the whole, but less able to achieve high AoA's at full elevator). I'd be appreciative if everyone could take their favorite aircraft out for a spin and report changes -- some may need re-tuning.
Maik Justus wrote: > Andy Ross wrote: > > Maik Justus wrote: > > > Therefore for an wing without flap, spoiler and slat [...] no surface > > > element is generated. > > > > Ah, OK. Yes, this was indeed a bug; I'm kinda shocked that we never > > noticed this before, it's been there since the code was written. > > Here it (the patch) is. Applied. > But before testing it with any YASim aircraft: I probably found > another bug in surface.cpp. For "general lift" and "flap-lift" the > effect of stall is calculated in stallFunc() resp FlapLift(). Yup, that looks correct to me. Applied. I'm not sure what the points was of the extra 1.0 in the return value; maybe a holdover from an earlier version where this function returned a scalar coefficient, and not a force? > If the fuselage is large in comparison to the wing, this amount can > be rather high. I don't think that's correct. As I read the code, you would get 1N of force per fuselage surface (of which there are maybe a few dozen across a large aircraft). The first bug is a whopper. This one is pretty much noise unless you're modeling an R/C aircraft; I'm not surprised it stayed hidden for so long. Andy ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Flightgear-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-devel
