1、ARR No. I_Ii6wNATIONAL ADVISORY COMMITTEE FOR AERONAUTICSItTIIRTIMI: REPi)RTORIGINALLY ISSUEDSeptember 191_ asAdvance Restricted Report L4116A METHOD FOR PREDICTING THE ELEVATORI_IECTION REQIYlRED TO LANDBy R. Fabian GoransonLangley Memorial Aeronautical LaboratoryLangley Field, Va.w_CPERTY CF J_ PR
2、OPULSIONLABORATORYUBRAII_CALIFORNIAINSTITUTEOF TF._HNOi.D#WASHINGTONNACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution ofadvance research results to an authorized group requiring them for the war effort. They were pre-viously held under a security status but
3、are now unclassified. Some of these reports were not tech-nically edited. All have been reproduced without change in order to expedite general distribution.L - 95Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduc
4、tion or networking permitted without license from IHS-,-,-NAC_%,coNATIONAL ADVISORY CO_ITTEE FOR AERONAUTICSADVANCE RESTRICTED I_EPORTA NE_OD FOR FREDKCTING THE ELEVATORDEFLECTION REQUIRED TO LANDBy R. Fabian GoransonSD%I_,:ARYA method is presented for predicting from basicairplane characteristics t
5、he elovator deflection requiredto maintain optimism landing attitude. Charts forevalu_tlng the components of the equation for theelevator deflection required to land, as well as acomparison of computed and measured values for 15 air-planes, are included. This comparison of experimentaland computed r
6、esults shows that, for preliminary designpurposes, the elevator deflection required to land canbe satisfactorily predicted from the basic airplanedimensions. Because of variations in piloting technique,the computed deflection is considered as the minimumvalue required to maintain landing attitude.A
7、simplified method of obtaining the downwash anglenear the ground and a limited analysis of the effect offlap t_e and deflection on tho aerodynamic-centerlocation and pitching-moment coefficient are presentedas appendixes.INTRODUCTIONAn important consideration in the horizontal-taildesign is the prov
8、ision of adequate olevator power tomaintain optimum landing abtitude. In view of thisfact, flight measurements of elevator deflections usedduring landings were published in reference i; howeverno analytical method for estimating the elevatordeflection required to land was available at that time.The
9、present study was thersfore undertaken in order todevelop a method by which estimates of the elevatordeflection required to land could be determined fromthe basic dimensions of a preliminary layout.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2 i_
10、Z- _e c tio,_percen/40 60 80u#t_e_-cho_d loco/bn_odj /eng/,Figure 4.- Variation of fuselage and engine-nacelle momentcoefficient KF wlth relative location of wlng and body.Wing root chord used to obtain fuselage factor and localwing chord to obtain nacelle factors. (From reference 2.)Provided by IHS
11、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Fig. 5 NACA ARR No. L4116_oZ-IJ_/J0oJ/JJ_ / o_._,/ / ;it_/aa;g _aaj u a.m_c_dd _/_leu/qC,.vaCuao _,/#,_ _ _a/_-n_saad-_!u./#u60: &Roif,g_,_00Hcp_o_io /oo_q% /“0SgOl e_zng_edd- o!w_ubuvoooiIProvided by IHS Not for Resa
12、leNo reproduction or networking permitted without license from IHS -,-,-NACA ARR No. L4116 Fi_. 6J/JJJJ /J J-. -.JJJJo,-4!,Mo4-3% o_D_D 0LbO“h _%i.,Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Fig. 7 NACA ARR No. L4116%IIProvided by IHS Not for Re
13、saleNo reproduction or networking permitted without license from IHS-,-,-NACA ARR No. L4116 Figs. 8,9,4 r_Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Fig. lOaNACA ARR No. L4116Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACA ARR No. L4116 Fig. lObI!IIII40|0Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Fig. 10cNACA ARR No. L4116Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
