On Thursday 06 April 2006 17:58, Hal V. Engel wrote: > On Thursday 06 April 2006 08:30 am, Mike Rawlins wrote: > > --- Lee Elliott <[EMAIL PROTECTED]> wrote: > > > On Wednesday 05 April 2006 20:45, [EMAIL PROTECTED] > > > > > > wrote: > > > > Trying to stall the C172r with 9.10.3 pre > > > > > > > > JSBSIM new version won't stall. Flies slow and > > > > > > loses > > > > > > > altitude but does not stall. > > > > > > > > YASIM stalls but no stall horn. Sound increases > > > > > > and changes > > > > > > > pitch as speed slows, then I get the drop off but > > > > > > never get > > > > > > > a stall horn? > > > > > > > > Ray KPHN > > > > > > The instrument probably needs tweaking. > > > > > > LeeE > > > > Are there any aircraft that behave appropriately with > > respect to stalling? I like flying c173, B737, and > > Fokker 100. In particular, it would be nice if the > > 737 would stall when lift is insufficient, etc. I > > assume modeling this is very difficult. > > > > Cheers, > > Mike > > I have yet to find any aircraft in FlightGear that stalls in a > realistic way. As you approach the stall the aircraft should > shudder and shake and this should become more pronounced as > the stall deepens. The shuddering and shaking should also be > audible. At the final stages of the stall depending on the > aircraft it should either mush straight ahead while still > shuddering and shaking or it should drop a wing and (for some > aircraft) enter a spin. Aircraft with a "critical wing" such > as the P-51 should stall with little warning (perhaps a little > shaking just before full stall) and should drop a wing very > quickly when stalled. Instead it mushes straight ahead like a > trainer but without any shuddering or shaking. Very > unrealistic. This is IMO one of the most important things > that needs improved in FG. > > Hal
Not speaking with any authority on the topic but while stalls are a very important aspect of flying, by definition, they are out of the 'normal' flight regime. Most, and certainly initial effort is going to be directed towards behaviour within the normal flight envelope but as Jon SB has pointed out FG, or JSBSim at least, has reached the point where effort will start to be devoted to this aspect of flight. However, JSBSim's approach is completely different to that of YASim, which has some out of the envelope behaviour 'built-in'. Having done quite a few disparate aircraft in YASim I think that given good enough reference data a YASim config could be tuned to be very close to reality in stall situations. When you think about it, the shuddering/buffet you encounter at/near stall is another area of out-of-the-enevlope flight behaviour. However, I think this could faked very convincingly already in YASim and probably in JSBSim too, simply by playing with mass distribution depending on conditions (anyone want to give it a go? :) LeeE ------------------------------------------------------- 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 _______________________________________________ Flightgear-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/flightgear-users
