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So really, "What is the air speed velocity of an unlaiden swallow?"
It's quite simple:
Drag on a body in a fluid is:
D = 1/2 (Cd*pi*r^2*rho*Vo^2) Cd = coefficient of drag of the swallow pi = 3.1415... r = radius of bird cross-section (approximating as a circle) rho = viscosity of air Vo = velocity For steady state flight, D (drag) = T (thrust), so:
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| Vo = sqrt(T/Cd*pi*r^2*rho) |
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