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Flying Machines: Construction and Operation: A Practical Book Which Shows, in Illustrations, Working Plans and Text, How to Build and Navigate the Modern Airship.

  
[title page]
  
PREFACE.
  
IN MEMORIAM.
  
CONTENTS

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EVOLUTION OF TWO-SURFACE FLYING MACHINE. By Octave Chanute.
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CHAPTER II. THEORY, DEVELOPMENT, AND USE.
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CHAPTER III. MECHANICAL BIRD ACTION.
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CHAPTER IV. VARIOUS FORMS OF FLYING MACHINES.
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CHAPTER V. CONSTRUCTING A GLIDING MACHINE.
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CHAPTER VI. LEARNING TO FLY.
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CHAPTER VII. PUTTING ON THE RUDDER.
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CHAPTER VIII. THE REAL FLYING MACHINE.
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CHAPTER IX. SELECTION OF THE MOTOR.
  
[section]
  
Average Weight Per Horse Power.
  
How Lightness Is Secured.
  
Multiplicity of Cylinders.
  
Horse Power and Speed.
  
Great Waste of Power.
  
What the Propeller Does.
  
Kinds of Propellers Used.
  
Placing of the Motor.
  
No Perfect Motor as Yet.
  
Features of Darracq Motor.
  
Propeller Thrust Important.
  
Designs for Propeller Blades.
  
Difference in Propeller Efficiency.
  
Comparison of Two Designs.
  
Experts Fail to Agree.
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CHAPTER X. PROPER DIMENSIONS OF MACHINES.
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CHAPTER XI. PLANE AND RUDDER CONTROL.
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CHAPTER XII. HOW TO USE THE MACHINE.
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CHAPTER XIII. PECULIARITIES OF AIRSHIP POWER.
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CHAPTER XIV. ABOUT WIND CURRENTS, ETC.
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CHAPTER XV. THE ELEMENT OF DANGER.
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CHAPTER XVI. RADICAL CHANGES BEING MADE.
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CHAPTER XVII. SOME OF THE NEW DESIGNS.
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CHAPTER XVIII. DEMAND FOR FLYING MACHINES.
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CHAPTER XIX. LAW OF THE AIRSHIP.
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CHAPTER XX. SOARING FLIGHT. By Octave Chanute.
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CHAPTER XXI. FLYING MACHINES VS. BALLOONS.
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CHAPTER XXII. PROBLEMS OF AERIAL FLIGHT.
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CHAPTER XXIII. AMATEURS MAY USE WRIGHT PATENTS.
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CHAPTER XXIV. HINTS ON PROPELLER CONSTRUCTION.
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CHAPTER XXV. NEW MOTORS AND DEVICES.
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CHAPTER XXVI. MONOPLANES, TRIPLANES, MULTIPLANES.
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CHAPTER XXVII. 1911 AEROPLANE RECORDS.
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CHAPTER XXVIII. GLOSSARY OF AERONAUTICAL TERMS.

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previous sectionCHAPTER IX. SELECTION OF THE MOTOR. Flying Machines: Construction and Operation: A Practical Book Which Shows, in Illustrations, Working Plans and Text, How to Build and Navigate the Modern Airship.
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Difference in Propeller Efficiency.

That there is a great difference in propeller efficiency is made readily apparent by the comparison of effects

illustration

Engine and Propeller of Curtiss Biplane.

[Description: Black and white photograph: Engine and propeller.]
produced in two leading makes of machines—the Wright and the Voisin.

In the former a weight of from 1,100 to 1,200 pounds is sustained and advance progress made at the rate of 40 miles an hour and more, with half the engine speed of a 25 horse-power motor. This would be a sustaining

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capacity of 48 pounds per horsepower. But the actual capacity of the Wright machine, as already stated, is 50 pounds per horsepower.

The Voisin machine, with aviator, weighs about 1,370 pounds, and is operated with a so-horsepower motor.

illustration

One of the Four-Bladed Propellers.

[Description: Black and white illustration: Four-blade propeller.]
Allowing it the same speed as the Wright we find that, with double the engine energy, the lifting capacity is only 27 1/2 pounds per horsepower. To what shall we charge this remarkable difference? The surface of the
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planes is exactly the same in both machines so there is no advantage in the matter of supporting area.

previous sectionCHAPTER IX. SELECTION OF THE MOTOR. Flying Machines: Construction and Operation: A Practical Book Which Shows, in Illustrations, Working Plans and Text, How to Build and Navigate the Modern Airship.
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