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

Aerospace Calculating static thrust

  1. Aug 31, 2011 #1
    I want to make a quad rotor UAV. i studied a lot but i did not find how static thrust is being calculated. In physics forum i have found an equation which is given below but i can not understand what is 'frac' and 'rho'.
    Equation is:
    T=\frac{c_T}{c_p}\frac{P}{nD}

    Where:
    P = power (ft-lb/s or kWW)
    T = Thrust (lb or kN)
    D = Prop Diameter (ft or m)
    n = rotation speed (rev/s)
    c_P = Power coefficient
    c_T = Thrust coefficient

    And:

    c_P=\frac{P}{\rho n^3 D^5}

    c_T = \frac{T}{\rho n^2 D^4}
     
  2. jcsd
  3. Aug 31, 2011 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    \frac is badly formed latex. If you provide a link to the earlier post, that may help someone interpret the formulas. rho is probably the density of the fluid in which the rotor or propeller is acting.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook