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National advisory committee for aeronautics
I\rar.,
1931.1
BOOK
REVIEWS.
39.5
applied to the general problem of the interference effects for a g-dimensional biplane, and formulae and charts are given which permit the characteristics of the individual wings of an arbitrary biplane without sweepback or dihedral to be calculated. In the final section the conclusions drawn from the application of the theory to a considerable number of special cases are discussed, and curves are given illustrating certain of these conclusions and serving as examples to indicate the nature of the agreement between the theory and experiment. Report No. 364, The Pressure Distribution Over the Wings and Tail Sur103 faces of a PW-9 Pursuit Airplane in Flight, by Richard V. Rhode. pages, illustrations, quarto. Washington, Government Printing Office, 1930. Price sixty cents. The investigation reported herein was conducted at Langley Field, Va., by the National Advisory Committee for Aeronautics at the request of the Army Air Corps to determine (I) the magnitude and distribution of aerodynamic loads over the wings and tail surfaces of a pursuit-type airplane in the maneuvers likely to impose critical loads on the various subassemblies of the airplane structure, (2) to study the phenomenon of center of pressure movement and normal force coefficient variation in accelerated flight, and (3) to measure the normal accelerations at the center of gravity, wing-tip, and tail, in order to determine the nature of the inertia forces acting simultaneously with the critical aerodynamic loads. The investigation comprised simultaneous measurements of pressure at 120 stations distributed over the right upper wing, left lower wing, right horizontal tail surfaces, and complete vertical surfaces in one installation and the same number of points distributed over those portions of the wings in the slipstream and the left horizontal tail surfaces in another installation, during a series of level flight runs, pull-ups, rolls, spins, dives, and inverted flight maneuvers. Measured also were the accelerations mentioned above, angular velocities, air speed, and control positions simulatneously with the pressures. The results obtained throw light on a number of important questions involving structural design. Some of the more interesting results have been discussed in some detail, but in general the report is for the purpose of making this collection of airplane-load data obtained in flight available to those interested in airplane structures. Report No. 371. Present Status of Aircraft Instruments, by Subcommittee on Air Navigation Instruments, N. A. C. A. 26 pages, illustrations, quarto. Washington, Government Printing Office, 1930. Price fifteen cents. The present state of development of aircraft instruments is summarized with emphasis on the present trend of development. The report includes sections on speed instruments, altitude instruments, navigation instruments, power plant instruments, oxygen instruments, instruments for aerial photography, fog flying instruments, general problems, and summary of instrument and research problems. The relative utility of the various types of instruments available for any one definite purpose is discussed in so far as reliable data are available. The research problems considered include both those of special interest to instrument engineers and to operators of aircraft. References are given to the more recent fundamental papers on the subject. R.
1931.1
BOOK
REVIEWS.
39.5
applied to the general problem of the interference effects for a g-dimensional biplane, and formulae and charts are given which permit the characteristics of the individual wings of an arbitrary biplane without sweepback or dihedral to be calculated. In the final section the conclusions drawn from the application of the theory to a considerable number of special cases are discussed, and curves are given illustrating certain of these conclusions and serving as examples to indicate the nature of the agreement between the theory and experiment. Report No. 364, The Pressure Distribution Over the Wings and Tail Sur103 faces of a PW-9 Pursuit Airplane in Flight, by Richard V. Rhode. pages, illustrations, quarto. Washington, Government Printing Office, 1930. Price sixty cents. The investigation reported herein was conducted at Langley Field, Va., by the National Advisory Committee for Aeronautics at the request of the Army Air Corps to determine (I) the magnitude and distribution of aerodynamic loads over the wings and tail surfaces of a pursuit-type airplane in the maneuvers likely to impose critical loads on the various subassemblies of the airplane structure, (2) to study the phenomenon of center of pressure movement and normal force coefficient variation in accelerated flight, and (3) to measure the normal accelerations at the center of gravity, wing-tip, and tail, in order to determine the nature of the inertia forces acting simultaneously with the critical aerodynamic loads. The investigation comprised simultaneous measurements of pressure at 120 stations distributed over the right upper wing, left lower wing, right horizontal tail surfaces, and complete vertical surfaces in one installation and the same number of points distributed over those portions of the wings in the slipstream and the left horizontal tail surfaces in another installation, during a series of level flight runs, pull-ups, rolls, spins, dives, and inverted flight maneuvers. Measured also were the accelerations mentioned above, angular velocities, air speed, and control positions simulatneously with the pressures. The results obtained throw light on a number of important questions involving structural design. Some of the more interesting results have been discussed in some detail, but in general the report is for the purpose of making this collection of airplane-load data obtained in flight available to those interested in airplane structures. Report No. 371. Present Status of Aircraft Instruments, by Subcommittee on Air Navigation Instruments, N. A. C. A. 26 pages, illustrations, quarto. Washington, Government Printing Office, 1930. Price fifteen cents. The present state of development of aircraft instruments is summarized with emphasis on the present trend of development. The report includes sections on speed instruments, altitude instruments, navigation instruments, power plant instruments, oxygen instruments, instruments for aerial photography, fog flying instruments, general problems, and summary of instrument and research problems. The relative utility of the various types of instruments available for any one definite purpose is discussed in so far as reliable data are available. The research problems considered include both those of special interest to instrument engineers and to operators of aircraft. References are given to the more recent fundamental papers on the subject. R.