曝光臺 注意防騙 網曝天貓店富美金盛家居專營店坑蒙拐騙欺詐消費者

the segment BC (Fig. 2.36) of the flare can be approximated by a circular arc. Let
R be the radius of this arc. Note that ZBOC : y. The appropriate equations of
motion for flight along the arc BC are
                                                                              W T/2
            L-Wcosy= Rg
                             T-D- Wsiny -0
Then,
        T-D
                                                      sin y ~ ~
                         W
Assuming y to be small, we obtain
                                  R - _ T/2W
          g~L W~
(2.346)
(2.347)
(2.348)
(2.349)
Assunung that the velocity remains constant on the arc BC and is equal to 'VA and
CL = CL,max,
L = ~p V~SCL,max
    = ;:p(1.3 Vsran)2scL,max
     -  1.69 W
        R = O+r99g
         S2 - g:Ry
(2.350)
(2.351)
(2.352)
    Estimation of landing ground run.   The forces acting on the aircraft during
the ground run are shown in Fig. 2.37.
Let
Fa = TR + D + p,(W - L)
                L
Fig. 2-37    Forces acting on an airplane duringlanding run.
(2.353)
154             PERFORMANCE, STABILITY, DYNAMICS, AND CONTROL
be the net retarding force during the ground run. Here, TR is the reverse thrust.
Then,
                                                   W iV dV  = -Fa                                    (2.354)
                  g ds
                                                                                            Wd( V 2)                                                   (2.355)
               ds=- 2gF
As before, we assume that the angle of attack during the ground runis held constant
and the net retarding force Fc{ varies as the square of the velocity as given by
                                        Fa = Fo + F V: F V2                           (2.356)
　
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