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Homework Help: Thrust,drag and lift on airplane Question

  1. Dec 14, 2009 #1
    1. The problem statement, all variables and given/known data

    If the engine thrust is F(T)=130kN and the plane's weight is W=180kN,determine the atmospheric drag F(D) and the wing lift F(L).
    What is the distance s to the line of action of the drag force?

    3. The attempt at a solution

    Well I have trouble with this question because I don't know where to start.In my statics book there is nothing on airplanes or about drag,thrust and lift.

    I was thinking like the resultant force = F(T)- F(D)

    I dont know the relationship between the drag,thrust and lift and couldnt find anything in my statics book.
    So any hint or advice how to start it would be greatly appreciated or is there any equation I need to use.

    http://img685.imageshack.us/img685/1364/11212009113824am.jpg [Broken]
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Dec 15, 2009 #2


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    its flying at constant velocity... so all accelerations must be zero, ie. static equilibrium...
  4. Dec 15, 2009 #3
    so then the drag is 130 and the lift is 180
    and to determine s I can take moments at point where W is pointing
    is this right?
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