We've seen what happens when the cardboard pieces are held horizontally in an air flow. We've seen what happens when the cardboard pieces are held at a slight angle in the air flow. Now let's take a look at what happens when the angle of the cardboard (or airplane wing) is too steep. At what point does this take place? What happens when the cardboard pieces are tilted too much in the air stream? The cardboard pieces will drop because lift no longer applies. The action/reaction becomes ineffective when the cardboard is tilted too steeply. In addition, the low pressure above the board flips over to the bottom when the angle of the cardboard is too steep. The resulting effect makes the cardboard (and the plane) drop because there is no lift. . .

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