Andy Ross <[EMAIL PROTECTED]> said: > Jim Wilson wrote: > > Andy Ross said: > > > The bad pilot technique theory is looking pretty good. If YASim can > > > get to 1400fpm at 300 knots, then I move that it be declared > > > officially innocent on all counts. :) > > > > Well maybe not yet...it is better with today's patch...but still run > > out of steam in the 29000 range. It also may be time related. In > > otherwords the situation gets worse over time. > > It's not time related. First off, ditch the autopilot. It gets stuck > behind the power curve every time I use it. When it does this, it > very rapidly (in the space of 30 seconds or so) gets you trimmed all > the way down to 200 knots, at which point the engines can't keep you > in the air anymore and you have to dive to regain airspeed. Just trim > for speed; this is really easy to do in an aircraft this big. You can > verify that the climb performance drops slowly off toward zero as the > altitude increases, and recovers as you descend. I've done a zillion > of these this afternoon. :)
Actually, I'm very familiar with how the autopilot works and the issue you are describing :-) For example's sake however, 300fpm and full throttle should have been maintainable with the autoplot code as it is. Believe me I'm babying this thing to get it up as high as possible. That said, my latest test (trimming for speed, no autopilot) shows a slight increase in the attainable altitude ceiling with your xml adjustment. But I'm still hitting top at just over FL300. When I switch to the old weathercm to see if I can get the FL360 yasim won't initialize the 747 (tried dc3 and c172 and they both come up). Any chance we're looking at another 2.95.2 math issue here...for both this bug and the differences in what we are seeing for flight performance? The evidence for my "time" question is that after I hit a stall and drop down several thousand to recover full speed, that attainable altitude ceiling decreases by 5-10% or so. It's only a question about possible accumulating error trouble, but you know the code and if my question doesn't turn on a light then don't worry about it. Just trying to help :-) Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
