On Wed, 2002-12-11 at 21:24, Curtis L. Olson wrote: > Dave Perry writes: > > I like the c172p-3d 3d model and 3d cockpit a lot. > > > > Three comments/concerns for the recent changes to the flight model: > > 1. The nose pitch-up when adding flaps seems extreem. If I don't > > change the elevator trim a lot, the plane actually stalls. If I recall > > correctly, the Piper Tri-Pacer had a slight pitch up with added flaps. > > But the Cessna 172 nose pitches down a little and you have to > > make minor trim changes more like the c182 in FlightGear. > > I have some experience with a very high fidelity C172 model > (commercial) based on real, instrumented flight data. Even at speeds > as slow as 90 knots the model will come close to looping unless you > add a lot of down elevator. I've never tried this in a real C172, but > I can see that for a real pilot, pushing forward on the yoke to hold > the nose down after applying flaps could become an almost unconcious > act. When you are flying from mouse/keyboard it's just not the same > and these sorts of effects can be surprising. Even just with flying > with a yoke and having your hands on it, you really don't need to add > much down force to keep the nose from ballooning.
I've never noticed a nose-up tendency when I pull on the flaps. But, I tend to pull them on slowly and gently - and at a lower airspeed (<= 90mph for landing). The flaps in the C172 make you go down, not up. OTOH, when you have full flaps down and you hit the throttle (in a go-around type situation), the nose almost shoots up into the air. It takes a lot of forward force on the yoke to keep the plane level with the ground. The lack of nose-up when I'm pulling on the flaps may just be because I'm correcting for the nose-up without thinking about it. I'll try to note this (along with the left-roll tendency) the next time I go flying. -Luke -- Luke Scharf, Jack of Several Trades http://www.ccm.ece.vt.edu/~lscharf _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
