动力机械和机身手册1(90)

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                     v2        V:
                                                                    b) Propejler aircraft
           Fig.233   Variation offorces witb'velocityduringtakeotfgrourufrun
where V7 is tihe velocit)r atliiftofiFancj
Then,
Fo = T - ,u W
Fi =T-D
                            l,s'ds = 2W f.Vi (__)
                      W - T/12     Fo
                    si=2g  Fo- -F,) e.~
The liftoff or the takeOffveloao] ~s usuaiUy equal to 1.2  Vsam.
(2.321)
(2.322)
(2.323)
(2.324)
                                               AIRCRAFT PERFORMANCE
    To minimiz;e                                                         149
  acceleratingfo:cthF.groO:r~dofru;n sr, we have to ma     re the value of the net
    takeoff ground run is the ang;ethefPtt,amkame9iff,that ~/ax;LY~, (2.e3~;~.optimize the
    dFa dD':r.'
       (ICL=-dCL+J [
                                                                            = --2q Sk CL + htqS
           =0
where q = 1l2p y2  Then,                                                                               (2.325)
                                      CL ~ C2 = 2~
           (2.326)
whereC2itenotesthe\ralueoflif/coefiicien :nFoismaximum.l[\en,
                                          Sl.min = -, (,,:.:)e:. Fo
where                     Fi*        (2.327)
Analtemativew ;mjniFm;z:T_qS(CDo+kCL    (2.328)
  takeoff. The .ffs~~p~e  d,gmtt_lift d:m:cg teshingcreas d tjir~ {S t012Xl2)seffS -    h-lifi dew:ces for
valueoftalceoff! rvl.butthebeneftispartiallyo: ~ec,xelnodfandmc~the
in dr:ag. Wheth:thththe%round di~stance is sm.aller for operation at lift coefiaent
c~oq:hlgt,raCti;Zon:wi 'deploymentofthehigh_liftdevicesdependsontheaircraft
　
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