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Homework Help: Calculating landing distance for Flight

  1. Nov 22, 2014 #1
    1. The problem statement, all variables and given/known data
    An a/c has an approach speed of45 m/s with descent angle of 7.1 deg. if the a/c load factor is 1.2 and constant deceleration at touch down is .25g (g=9.81).its total landing distance approx over a 15m high obstacle is

    2. Relevant equations

    Sa=(h-hf)/tan( teta)
    R-radius,hf-flare height,Sa-approach dist,Sf-flare distance,Sg-ground roll
    3. The attempt at a solution
    well i have found value for approach and flare distance.but for ground roll im lacking mass to consider for calculation or do i miss smeting?.. any suggestion wld be helpfull.
  2. jcsd
  3. Nov 23, 2014 #2


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    in your work-energy equation for Sg, m/F per Newton 2 is given! Or use the kinematic equations instead.
  4. Nov 23, 2014 #3


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    You have an initial horizontal velocity at touchdown and the deceleration. That's enough. For ground roll, and leaving aside air resistance, mass doesn't matter.
  5. Nov 23, 2014 #4
    yeah.i see it now,its a simple force eqn. thanks all
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