adamschneider wrote:And if it's true that "thick air requires twice the hyzer as moderate air," well, remember that humid air is thinner than dry air.
This is not the case. It's a question of viscosity. Wave your hand through the air in front of your face. Now go make the same motion with your hand in a sinkfull of water. Water resists the motion a lot more. The same principle applies to a disc in flight.
This can be observed by going out and playing in the rain. You'll find yourself flipping the bejesus out of things which, in dry weather, have a stable or overstable flight.