Aeroplane construction
Transcriber’s Note
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A Handbook on the various Methods and Details of Construction employed in the Building of Aeroplanes
BY SYDNEY CAMM ASSOCIATE FELLOW ROYAL AERONAUTICAL SOCIETY
LONDON CROSBY LOCKWOOD AND SON 7, STATIONERS’ HALL COURT, LUDGATE HILL
1919
PRINTED BY WILLIAM CLOWES AND SONS, LIMITED, LONDON AND BECCLES.
The articles embodied with other matter in this book, were intended as a broad survey of the principles and details of modern aeroplane construction, concerning which there is a noticeable deficit amongst existing aeronautical literature.
They were written at a time when specific references to modern British aircraft were forbidden, and although from a comparative point of view this is to be regretted, the details and methods dealt with are, in the author’s opinion, representative of those most generally used in machines of present-day design. It is hoped that the book will appeal not only to those engaged on the manufacture, but also to those concerned with the uses of aircraft.
S. C.
The purpose of this book is to give some indication of the principles and methods of construction of modern aeroplanes, as distinct from those considerations pertaining purely to design, although occasional references to various elementary principles of aerodynamics have been found necessary to illustrate the why and wherefore of certain constructional details.
To many the aeroplane is a structure of appalling flimsiness, yet the principle which it exemplifies, that of obtaining the maximum strength for a minimum of weight, constitutes a problem of which the solving is not only an unceasing labour, but one demanding the observance of the best engineering procedure. The whole future of aviation, commercially or otherwise, may be said to be indissolubly bound up with the development of efficiency; and whether this is to be attained in improvements in aerodynamical qualities, by the discovery of a material giving a greatly enhanced strength to weight ratio, or by progress in the arrangement of the various members of the complete structure of the aeroplane, is a matter upon which some diversity of opinion exists. However, it is certain that the very great developments of the last few years are due more to refinements in design rather than construction; and it is questionable whether the constructional work of the modern aeroplane has developed equally with design, so that, even taking for granted the oft-repeated, but very doubtful, statement that we are approaching the limitations of design, there is certainly plenty of scope for experiment and improvement in the constructional principles of the modern aeroplane.
Sydney Camm
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PREFACE
TABLE OF CONTENTS
AEROPLANE CONSTRUCTION
Standardization of Details.
Methods of Manufacture.
Metal Construction.
Variable Qualities of Wood.
Shrinkage.
Unreliability of Tabulated Tests.
Virginia Spruce.
Norwegian Spruce.
Ash.
Hickory.
Walnut.
Mahogany.
Birch.
Poplar.
Oregon Pine.
Other Woods.
Multi-ply Wood.
Defects in Timber.
Steel.
Steel Tube.
Aluminium.
Duralumin.
Spar Sections.
Hollow Spar Construction.
Strut Sections.
Strut Materials.
Tapering of Interplane Struts.
Design of Strut Sections.
Fuselage Struts.
Effects of Standardization.
Shaping of Main Spars.
Defects of Glue in Wing Spars.
Arrangement of Planes.
Types of Wing Ribs in Use.
Ribs under Compression.
Importance of Even Contour.
Wing Tip Details.
The Sagging of Fabric.
False Ribs.
Pressure at Leading Edge.
Effect of Lateral Control.
Leading and Trailing Edges.
Efficiency of the Raked Wing Tip.
Wing Baffles.
Metal Wing Construction.
Fabric Attachment.
Brazing and Welding.
Connections in Use.
Head Resistance of Strut Sockets.
The Pratt Truss.
Monoplane Trussing.
Wireless Wing Structure.
Anchorage of Lift Wires.
Biplane Trussing.
Single Strut Systems.
1½ Strut Machines.
Drift Bracing.
Properties of the Various Types.
Fuselage Types.
Box-Girder Type.
Jointing of Longerons.
Diagonal Wood Bracing.
Three-ply Fuselage.
The Monocoque Type.
Fuselage Contours.
Types in Use.
Steel Tube Fuselage Construction.
Principles of Design.
Undercarriage Types.
Recent Developments.
Methods of Suspension.
Shock Absorbing Effect of Tyres.
Connections.
Axle Fairings.
Undercarriage Brakes.
Housing of Undercarriage during Flight.
Main Principles.
Control by Inherent Stability.
The Instinctive Principle.
Vertical Column Control.
Wheel Controls.
The “Dep” Control.
The Wright System.
Various Wires used.
Result of Tests.
Stranded Cable.
Cable Connections.
Relative Strengths.
Streamline Wires.
Essential Requirements of an Engine Mounting.
Materials.
Rotary Engine Mountings.
Overhung Mounting.
A Stationary Engine Mounting.
Multi-Engine Mountings.
Accurate Part Production.
Drilling of Bolt Holes.
Locking of Bolts.
Truing of Main Planes.
Fabric Covering of Planes.
Fuselage Erection.
Checking of Fuselage.
Alignment of Complete Machine.
Alignment of Machine in Side Elevation.
Plan Alignment of Machine.
Tension of Wires.
INDEX.
Transcriber’s Notes