Sometimes when I am flying the Cessna 172, I start up the>engine with the spacebar but after I release it, the propeller>stops spinning again, but at other times this does not>happen.sounds as if it's supposed to model a realistic engine? >4. Sometimes when I am in the air, the plane will start to>pitch and dive for no apparent reason, especially to the left.>Is this connected with the previous problem?how exactly did you ensure that all your controls are 'centralized'?If you enable the hud while your controls are in neutral position, does the hud display neutral positions, too?>3. I have already>ensured all my controls are centralised before take off.What are your weather settings?Have you verified whether the problem remains the same if you simply disable all winds (disable metar!)?Also, does the problem appear to be specific to certain aircraft/FDMs?JSBSim aircraft are somewhat famous for this tendency.>2. I compensated for this by moving>the rudder so the plane turns right, but when I reset the>rudder position the plane starts veering again.

Whenever I accelerate any plane down the runway, it will>start to veer to the left. >I've been using Flightgear for a few weeks now, and I must>say it is an excellent program. These are the cases where you may indeed benefit from FlightGear's open architecture, providing you the possibility to simply refine or even replace any aircraft's FDM in order to improve it.>Finally, I would like to know, what would happen if I fly into>an area that I do not have scenery for?try it: you won't see any terrain/scenery, so the only thing you'll get is ocean, however the navaids remain working. Without knowing any details (aircraft, weather settings (temperature!), configuration, altitude, airspeed etc.) it is hard to determine if the behaviour you are seeing is indeed a 'bug' or indeed realistic.Besides, not all FlightGear aircraft can currently be considered to be functional, some have a pretty basic FDM that will only work properly within a certain flight envelope.The citation is a good example for this: it's an excellent model and features an awesome 3D cockpit, however its FDM is barely flyable-unfortunately. How do I prevent the>above two from happening?So, there are many things that need to be taken into account. >and so far I have not managed to land any plane and>keep it on the ground a single time either it crashes (gets>stuck) or bounces into the air again. Likewise, the weather settings may also influence the aircraft's peformance.Apart from that I am not sure if you are familiar with the fact that IAS (indicated airspeed) necessarily decreases at altitude, even though your TAS (true airspeed) and ground speed may be totally sufficient. stall?), you will want to verify that you are using a proper AoA and configuration (flaps, gear). However, if you slow down ridiculously (i.e. If I turn>in small increments, nothing seems to happen at all.How exactly do you control FlightGear (keyboard,mouse,joystick/yoke), is this a general problem, or does it also occur if you switch control mode?And what's the value of your /sim/model-hz property?Have you tried adjusting this value to your hardware?Also, does the same problem occur if you use the autopilot to control the aircraft?>Also,whenever I climb, I will start to lose airspeed drastically>after some time,regardless of the angle of incline of the elevator, in general, climbing usually entails an decrease in airspeed, so you have to compensate for this by increasing thrust. When I do the same to the>YF-23, it pitches to the left and starts to stall. For example, when I turn the 737 right, it will start>pitching and diving dangerously. Regarding the terrain follow, I'm experiencing the>problem for most of the planes I've flown so far (such as the>Cessna 172, Boeing 737, YF-23, etc.), and as for the wind>speed, I've already turned wind off.Are using any sort of input hardware (joystick,yoke,pedals)?If so: are you sure that your controls are in a centered/neutral position?>And I also seem to be experiencing problems turning the>planes. >Ok, I'm not sure about the FDM version, but I'm using FG>0.9.9.

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