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8 results for “drag”

Formulae (8)

v_t = \sqrt{\frac{2mg}{\rho A C_d}}

Constant fall speed when drag balances gravity.

F = 6\pi\mu r v

Drag on a small sphere in viscous flow.

F_D = \tfrac{1}{2}\rho v^2 C_D A

Aerodynamic drag on a moving body.

D = \tfrac{1}{2}\rho v^2 S C_D

Aerodynamic drag force on the aircraft, analogous to lift with a drag coefficient.

GR = \dfrac{d}{h} = \dfrac{L}{D}

Horizontal distance traveled per unit of altitude lost equals the lift-to-drag ratio.

C_{D,i} = \dfrac{C_L^2}{\pi e AR}

Drag due to lift, decreasing with higher aspect ratio and span efficiency.

AR = \dfrac{b^2}{S}

Ratio of wingspan squared to wing area; higher AR reduces induced drag.

T = \dfrac{W}{L/D}

In steady level flight, thrust must equal drag, which is weight divided by L/D.