Can anyone confirm this equation? Prop. Thrust

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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?
 

Answers and Replies

FredGarvin
Science Advisor
5,050
6
You might want to try this one:

[tex]T=P_{io}^{2/3}(2 \rho A)^{1/3}[/tex] where

[tex]T[/tex] = thrust
[tex]P_{io}[/tex] = (induced) power of the engine
[tex]\rho[/tex] = density
[tex]A[/tex] = propeller area
 
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