AERONAUTICS FOURTH ANNUAL REPORT OF THE NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS 1918 , .,. .-.... ..... ,_. .. $ .,,:..:, .*J:ii 457 . ...= ...... .... WASHINGTON GOVEBNhIFLNTPmNTrNG OFFICE l,zo . coNmm. The National AdvieoryOmnmitteefor AeronauticJY. ...**..*.* ., .*..*.... 9 bmtien@ ti@atim ....... .. L. 10 The executive committee. 10 Subcommitkle ..........- .. .. 10 tictiom oftiemtittie ......... ... 13 ~tionof tientic mdr. wmk........ 14 Actititiee ofthe technical subcomnu"tti ...... ... 14 Aim& dwfgn and .titieetipblem ..... 14 Navigationofaircraft. aeronauticinstruments, md ~fiM ........ .16 Pow&plan@forA ....... ..L . - 16 Standardization and fnveatigationof materiafa for&craft ..... ....... 20 SWlmfitim for@t ............. 20 Free Sight @k ...... 20 R81ationofthe stmoephemto acmxmutice......... 21 Q.mformtittee .............. 23 The r=m’ch laboratory........... .. 24 The wind tunnel ........ 24 omc9 Oftw2_utid hem ............ 24 Themtitie ~ati. Wncyfor &e=ttiement d@uW ......... ....... 26 Aircraftproduction........... 26 ~Ohke~omn r.ch . .. .. .. .. .. .. .. .. .. .. .. .. 25 Mence=d ~titia ....... 26 Airmail Km&e... .... .. 26 (lid aeriel tmmport ..... 27 Electromagneticeyncbronfzerformroneutfcel macbimeguns.... .. .. .. 27 Veneerwingconstruction...... .... ..*...... 27 Airplanemapping camera... .. 27 Aimraftengine fide .......... 27 Evolution ofakcraft engfnea...... 28 Aeronauticalfl.lventiom..... 29 Technfcal?0pOd8............. 20 Generalproblem and activities........ ......... 22 E!emeoutatandfngprob~enmin aeronaudce..... w iL SbbfIity w determined by msthematiml fnvmtfgation..... 44 B. A&peed metersand aeronauticfmtrumenta.... .. 44 c. WmgSectione...... .. .. 44 . D. @51MLI..... ....... ... .. 44 E. ~pdl~ ...... 47, F. Form ofaiqiane ..... .. .. .. 47 G. MO communication......... 47 H. Meteorologyfn relstion to aeronsutice.... 47 Phyrdcalproblems... 48 A. Noncomxdvemateriala.............. 48 B. Flat aud camberedenrkcee........ 48 C. Terminal connections.... .. 48 D. bnetructive materide ... 4s E. &n-tion dbuopt@= for~Wr-ti&@ ... --------------------------------------- 49 F. Nomenclatureforaeronr+uticn....... 49 G. f3peciJIcstfonEforaeronautic nwterhih...... ..- . 49 H. Biblfogmphyof881’O~Uti@. 49 I. OoWction,m- and ieeuanceofreporfa.. ............. .. 49 J. Limitation ofeizeofairplanea..... ...... .. .. 49 Financfrdreport... .. ..