Op 02-01-12 09:37, thorsten.i.r...@jyu.fi schreef: From a general flight dynamics standpoint: all issues point to a too low weight (including the breaking).
Cheers, Eric > Continuing the list: > > DG-101G: > > I tried to do some soaring in the DG-101G. There seems to be something > wrong with the plane's inertia. > > * To turbulence, it reacts much more violently than other planes. I > thought a while ago that this may be due to a different implementation of > turbulence in YaSim and JSBSim, but I'm not sure any more. Even a moderate > magnitude of 0.2 leads to wild ups and downs from -4 m/s to + 4 m/s (the > variomenter seems to react instantly, which is another thing which isn't > very realistic). > > * The real giveaway is aerotow. I have to add that this is something I can > fly and have done in real life, there's no way I am doing anything wrong. > On the ground, when the dragger starts to pull and the rope comes under > tension, the glider suddenly accelerates forward to ~180 km/h rises wildly > and *overshoots* the dragger as if even the small force exerted by the > rope could accelerate the glider tremendously (no intertia). In reality, > it takes a lot of time to accelerate the glider under aerotow on the > ground - for about 10 seconds someone needs to run with the glider to keep > the wings level, for another 10 seconds or so the glider can do it on its > own, then the glider lifts off the ground, finally the dragger lifts. It > is quite physically impossible for the glider to overshoot the drag plane > from above (and quite easy in the simulation), basically all you need to > do is keep behind the dragger and try not to lift its tail too much, > controlling speed is not an issue. > > In addition, I was unable to get any brake action either on the ground or > in the air. The ground friction coefficients seem to be all wrong, the > plane can roll for a kilometer after touchdown, but in reality once the > tail comes down, that exerts quite a bit of drag and slows the plane down > even if no brakes are applied to the wheel. > > Right now the only thing that does seem to work properly is gliding > outside of thermals (probably the missing inertia factor cancels here, or > the problem is with external forces only, but there are none?). > > English Electric Lightning: > > Nothing wrong with it, but if anyone would like to add a new splash screen > picture, I have a nice series from the top of a ballistic arc at around > 65.000 ft with nice aerial views of Nevada. Just let me know. > > * Thorsten > > > ------------------------------------------------------------------------------ > Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex > infrastructure or vast IT resources to deliver seamless, secure access to > virtual desktops. With this all-in-one solution, easily deploy virtual > desktops for less than the cost of PCs and save 60% on VDI infrastructure > costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox > _______________________________________________ > Flightgear-devel mailing list > Flightgear-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/flightgear-devel > > ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
