I haven't seen charts like those you describe for the AH planes although there are performance curves available for speed and climb rate at a given altitude. I'm sure the turn rates are part of the code as that would have to be a fairly important component of the flight model. I see you're looking for G 1-6 as I'm sure you understand that 6G is the point at which you would black out within a few seconds. That's a constant. Structurally, yeah they're all different and that would also be part of the models and another constant. That plane would start to break apart at a certain stress level every time. You know the performance numbers would be impacted by configuration of the aircraft and also by the altitude? The weight of things like fuel, bombs and ammo, whether you're using flaps, etc., would all impact turn performance. A piston engine might generate more power at one altitude than another affecting power to weight ratio again affecting turn rate. Some planes that are beasts below 15K are all but useless above 20K. That said there is no set in stone number (other than the structural limits) regarding turn rates as it's all relative to the variables above. The turn rate charts you're looking for, if you look closely, are performance numbers for a particular aircraft using a particular configuration at a particular altitude. They would be accurate but only for those parameters.