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**can anyone confirm this equation?? Prop. Thrust**

there are many websites that calculate propeller Thrust, and they never show any formulas for it... and i somehow manage to find the formula from NASA website, but when i compare the result with each other, i get totally different numbers...

Thrust = (density)(pi)(radius of prop)^2(2)[(2Vk(RPM) + k(RPM^2)]

where k is coefficient of efficiency of prop.

V = speed, V=0 when static

if i just work with the units only, i get the force unit no problem, but the result is way off from the number from websites..

anyone know which one is correct?