## The Elements of Aerofoil and Airscrew TheoryMore than half a century has elapsed since the first edition of The Elements of Aerofoil and Airscrew Theory appeared in 1926, a period in which massive advances have been made in the understanding and description of aerodynamic phenomena. Yet Glauert was an acknowledged master of his subject and his book remains the most lucid and best organised introduction to the fundamental principles of aerodynamics that has ever been written. This new paperback edition reprints the text of the second edition of 1947, with supplementary notes by H. B. Squire. |

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### Contents

Introduction | 1 |

Bernoullis Equation | 10 |

The Stream Function | 18 |

Circulation and Vorticity | 33 |

The Velocity Potential and the Potential Function | 48 |

The Transformation of a Circle into an Aerofoil | 58 |

The Aerofoil in Two Dimensions | 80 |

Viscosity and Drag | 94 |

The Flow round an Aerofoil | 156 |

Biplane Aerofoil | 171 |

Wind Tunnel Interference on Aerofoils | 189 |

The Airscrew Momentum Theory | 199 |

The Airscrew Blade Element Theory | 208 |

The Airscrew Wind Tunnel Interference | 222 |

Appendix | 227 |

Bibliography | 230 |

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### Common terms and phrases

aerofoil section airscrew angle of incidence angular velocity aspect ratio axial velocity Bernoulli's equation biplane system blade element body boundary layer centre of pressure chord circulation round closed curve conformal transformation coordinate corresponding determined distance drag coefficient elliptic loading equal expressed finite flat plate flow past flow pattern fluid element fluid solution form drag formula hence induced drag integral interference irrotational Joukowski laminar lift coefficient lift force line vortex load grading curve monoplane aerofoil normal induced velocity numerical values obtained parallel perfect fluid plane potential function profile drag radial rectangular aerofoil represents resultant force rotation round the aerofoil shown in fig slipstream source and sink span stagnation point straight line stream function stream lines surface thrust and torque trailing edge trailing vortices two-dimensional motion uniform stream velocity components velocity of sound velocity potential viscosity vortex sheet vortex system wind tunnel