Vx/Vy
Just reading up on some POF - looked through some old posts and came across this: "Vy is the speed of maximum excess power = power available - power required. If power available were not a function of speed, that would be the same as minimum power required speed (minimum sink rate for a glider). But since power available increases with speed, Vy occurs at a higher speed than minimum power required."
*"But since power available increases with speed" - can someone explain this to me?