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Homework Help: Aircraft Performance Question -- Berguet

  1. Jun 30, 2014 #1
    1. The problem statement, all variables and given/known data
    What cruise velocity should the aircraft fly to maximize the cruise range?
    Aircraft mass (excluding fuel), m0= 14000kg
    Mass of fuel, mf = 2500kg
    Specific fuel consumption of aircraft engine, sfc = 2.8[itex]\times[/itex]10-5 kg/N/s
    Drag polar, CD = 0.02+0.08CL^2
    Planform area of aircraft wings, S = 65m2

    2. Relevant equations
    Breguet Equation
    Coefficient of Lift

    3. The attempt at a solution
    I am trying to find the coefficient of lift but there has been no given velocity. I then try to find the velocity but there is no given coefficient of lift. I feel like I'm going around in circles.
    L=W (14000+2500)[itex]\times[/itex]9.81=161865N
    Last edited: Jun 30, 2014
  2. jcsd
  3. Jul 1, 2014 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Are you not assuming uniform level flight?
    Does that not make the lift equation rather simple?

    How about showing the details of the working, with reasoning, that you have already.
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