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The simplicity of flight
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Wing Area & Weight
Consider two paper planes, each the same size and weight. Plane B is folded in such a way that it has half the wing area of plane A.
When you fly them, B has to fly faster to achieve level flight and it needs a bigger push than A to do so. This holds true for all flight.
The relationship between weight, wing area and velocity is represented by the formula
w = 0.3 x dv²s
w = weight    0.3 = lift coefficient
d = air density    v = velocity
s = wing area
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The Equations of Flight
wing area & weight |  weight & velocity |  finesse & power |  human powered flight
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With the same push,
A will fly further than B.
The 0.3 lift coefficient relates to an angle of attack
of 6 degrees, which for birds and planes is an economic relationship. Steeper and the plane goes slower and gets more lift. Shallower and it goes faster and gets less lift.