Vivian Meazza <[EMAIL PROTECTED]> said: > > Josh Babcock > > > Vivian Meazza wrote: > > > > > > > >I enter the loop in a shallow dive, 2nd stage boost on, 350 > > kts, pull > > >baaack the stick and the model rolls violently and does not > > enter the > > >loop ... Works fine in other models so it's not the obvious - the > > >joystick. But I expect I'm doing something wrong. > > > > > > > > > > > Yup. Specifically, you are doing a snap roll. If you can > > keep the the > > AOA down, the plane won't stall and go into a snap roll. You > > could also > > try adding some flaps, but I'm not sure if that would bleed > > off too much > > energy. Best to just make the loop bigger. Remember, pull back a > > little, and the plane goes up. Pull back a lot, and the > > plane goes down > > ... fast. > > Thanks for the advice. It's not easy without Pilot's Notes specifying some > entry conditions. I was guessing 350 kts I was probably pulling back too > hard, difficult to remember. Too slow, and the model falls off the top, of > course. Back to the Hunter - it's much easier - but I designed it that way, > and it flew that way too :-).
It sure is fun doing those, I just tried it for the first time in a while on the p51. You want to get up in the air (4500-5000ft agl). Manfold pressure should be in the 50-55 range, and prop pitch at max rpm. Go into a nice dive and pull back in the low 2000ft range. Once you get it the aircraft going good you can actually pull back pretty hard...and you can do multiple loops if your pilot has the stomach. You'll stall it quicker if you do a large loop, it gives gravity too much time to bleed off your momentum. Flaps will increase drag and not really help much with those stalls. The FDM is probably a little off. Andy just made a prop gearing change to YASim a couple weeks ago that should be useful in making the P51-D more accurate with a little tinkering. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
