Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Can anyone confirm this equation? Prop. Thrust

  1. Feb 5, 2007 #1
    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?
     
  2. jcsd
  3. Feb 6, 2007 #2

    FredGarvin

    User Avatar
    Science Advisor

    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
     
    Last edited: Feb 6, 2007
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Can anyone confirm this equation? Prop. Thrust
  1. Prop Question (Replies: 2)

Loading...