.

REPORT No. 91 t

NOMENCLATURE

FOR AERONAUTICS

~ TEREEPARTS , BY NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS

195

INTRODUCTION.

The following nomenclature and list of symbols were approved by the Executive Committee of the National Adtisory Committee for Aeronautics, for publication as a technical report on ApriI 1, 1920, on recommendation of the Subcommittee on Aerodynamics. The purpose of the committee in the preparation and publimtiori of this report is to secu!e uniformity in the official documents of the Government, smd, as far as possible, in technical and other commercial publications. This report supersedes all previous publications of the committee on this subjec.t. The Subcommittee on Aerodynamics had charge of the preparation of the report. Ik was materially assistedby an Interdepartmental Conference on Aeronautical Nomenclature and Symbols, organized by the Executive Committee, with the approval of the War and Navy Departments, for the purpose of giving adequate representation. to the divisions of the Army Air Service and to the bureaus of the Navy Department mast concerned. The first meeting of the interdepartmental conference was held on October 23, 1919, and the second meeting on January 15, 1920, at which meeting this report was unanimously approved and recommended t.o the Subcommittee cm Aerodynamics, with the reservation that stability terms and power-pkmt terms be given further and special consideration. The stability terms -wereaccordingly referred for special consideration to Messrs.E. B. WilSOLJ’.C Eh.msaker,ii. F. Zahm, E. P. Warner, and H. Bateman, and the power-plant terms -were referred to the Subcommittee on Tower plants for Aircraft. The complete report was adopted by the Subcommittee on Aerodynamics on March 8, 1920, and recommended to the Execuii~e Committee for approvaI and publication. The personnel of the two organizations primariIy concerned with the preparation of this report follows. WBCOMMITTEEON AERODYNAMICS. Dr.Tom F. HiimoED,Chairman. Cwnmsnder J. G.HUNSAKER, UtitedStatesNavy. Dr.30SEPII S. AXES,ViG?Chairman. Dr. A. F. %.w Prof.@IA-RLES F, MARVIX. Dr.L. J. BIUGGS. M. T. H. BANE, UnitedShtesArmy. Dr.M. D. HERSEY. Lieut.001.V. E. (MaK, ‘UnitdStatesArmy. ~. E. ~. ~AEh3R,&IW2@J.

CONFERENCE ON AEFtONAtJTICAL NOMENCLATURE AA? SYMBOLS. INTERDEPARTMENTAL ?iAVYDEPARTMENT.

NATIOXm ADVDOEY COX3fmEE FORAEROXAmIm.

Bureau of @m&ms

Dr,JOSEPE S. kEi3, (%air’man. Prof.~mmEs F. ~VIN. Mr. G. W. LEWIS. %fr.E. P. ~ARh3% Mr.J. F. v[croEY,&creta??. W.AE DEPA13TUEXT. Air S%ruice, Fas%ington:

G-J.E. S. GORRELL. Lieut.G-J.L TV.ROBBINS. Maj.ROBERT SOUBIIZAN. ~aj. &f.AxWEM @iBY. Air Seruice, Engineering Dizisian:

CM.T. ELBANE. Lieut.@I. V. ~. ~wK. Mr.’77.F. GEIiHARDT.

Commander KENNETH IVm-mci. 13uw2u of ConMwtior2 and Repa