Deep Stall

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Deep Stall

Author : Philip K. Lawrence,David W. Thornton
Publisher : Routledge
Page : 160 pages
File Size : 48,9 Mb
Release : 2017-05-15
Category : Business & Economics
ISBN : 9781351945851

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Deep Stall by Philip K. Lawrence,David W. Thornton Pdf

Deep Stall applies a framework of strategic analysis to the Boeing Company. Boeing is the world's largest aerospace / defence company, with turnover in the region of US $60bn. The book examines the relative decline of Boeing in the civil aircraft market in relation to European manufacturer, Airbus. The aim of the book is to utilize the concept of strategic value to explain Boeing's decline. The authors define this concept as investment in people and technology to leverage future market success by developing innovative new products, arguing that Boeing has neglected strategic value in favour of shareholder value, defined in terms of short-term cash benefits. The rationale for the book exists both in the fact that the story in itself is interesting and also in the wider framework of analysis concerning the correct strategic approach for running a high technology business. The argument illustrates what can happen when quarterly returns become the predominant strategic rationale for a company. In the U.S. the business media (Economist, Forbes, Fortune, and Business Week etc) are now focusing on the question of Boeing's decline and the major implications for the U.S. national interest. Boeing is one of the jewels in the US technology crown, but today U.S. jobs and capability are being exported abroad, with most of its aircraft program work based in Asia. This is a hot topic in the US which explains why the business media are now so interested in this question. The book sits squarely in the centre of this debate. Deep Stall concludes with a brief analysis of the recent fight-back that has been evident in Boeing's fortunes and the successful campaign to sell the new 787. The authors probe the question of whether Airbus or Boeing is likely to dominate in the next ten or fifteen years.

A Study of Dynamic Stall Vortex Development Using Two-Dimensional Data from the AFDD Oscillating Wing Experiment

Author : Myung J. Rhee
Publisher : Unknown
Page : 112 pages
File Size : 51,5 Mb
Release : 2002
Category : Aerodynamic load
ISBN : NASA:31769000647134

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A Study of Dynamic Stall Vortex Development Using Two-Dimensional Data from the AFDD Oscillating Wing Experiment by Myung J. Rhee Pdf

The purpose of this study is to examine the previously unpublished instantaneous pressure data of the Aeroflightdynamics Directorate Two-Dimensional (2D) and Three-Dimensional (3D) Oscillating Wing Experiment to better understand the process of dynamic stall vortex development on the NACA 0015 airfoil. This report presents representative 2D instantaneous pressure data for the upper and lower surfaces of the airfoil at various chordwise locations obtained at specific angles of attack during upstroke and downstroke cycles. Furthermore, the report contains a complete set of plots of instantaneous pressure distributions for the upper surface for all the 2D data sets obtained in the experiment. First, the lift, drag and pitching moment data of various testing conditions are reviewed and analyzed to classify the data both with and without a boundary layer trip into "no stall," "moderate stall," and "deep stall" data. Next, instantaneous pressure distributions on the upper surface of the airfoil are examined for the study of vortex development. The lift and pitching moment data are analyzed to document the dynamic overshoot which delays the development of the stall on the airfoil. Next, the range of angles of attack are selected where the lift and pitching moment data shows significant changes from unsteady flow behavior daring oscillation cycles. Furthermore, based on the unsteady flow characteristics found in each classification of dynamic stall, analysis is continued to identify the conditions where the reduced frequency clearly affects the unsteady flow behavior of the airfoil during the oscillation. This can result in a change of the dynamic stall classification of the airfoil response under various unsteady flow conditions. These conditions are discussed in detail in the comparative studies.

TAC Attack

Author : Anonim
Publisher : Unknown
Page : 36 pages
File Size : 47,5 Mb
Release : 1985
Category : Airplanes, Military
ISBN : MINN:31951D00691639B

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TAC Attack by Anonim Pdf

Advances in Wind Turbine Blade Design and Materials

Author : Povl Brondsted,Rogier P. L Nijssen
Publisher : Elsevier
Page : 485 pages
File Size : 44,8 Mb
Release : 2013-10-31
Category : Technology & Engineering
ISBN : 9780857097286

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Advances in Wind Turbine Blade Design and Materials by Povl Brondsted,Rogier P. L Nijssen Pdf

Wind energy is gaining critical ground in the area of renewable energy, with wind energy being predicted to provide up to 8% of the world’s consumption of electricity by 2021. Advances in wind turbine blade design and materials reviews the design and functionality of wind turbine rotor blades as well as the requirements and challenges for composite materials used in both current and future designs of wind turbine blades. Part one outlines the challenges and developments in wind turbine blade design, including aerodynamic and aeroelastic design features, fatigue loads on wind turbine blades, and characteristics of wind turbine blade airfoils. Part two discusses the fatigue behavior of composite wind turbine blades, including the micromechanical modelling and fatigue life prediction of wind turbine blade composite materials, and the effects of resin and reinforcement variations on the fatigue resistance of wind turbine blades. The final part of the book describes advances in wind turbine blade materials, development and testing, including biobased composites, surface protection and coatings, structural performance testing and the design, manufacture and testing of small wind turbine blades. Advances in wind turbine blade design and materials offers a comprehensive review of the recent advances and challenges encountered in wind turbine blade materials and design, and will provide an invaluable reference for researchers and innovators in the field of wind energy production, including materials scientists and engineers, wind turbine blade manufacturers and maintenance technicians, scientists, researchers and academics. Reviews the design and functionality of wind turbine rotor blades Examines the requirements and challenges for composite materials used in both current and future designs of wind turbine blades Provides an invaluable reference for researchers and innovators in the field of wind energy production

General Aviation Aircraft Design

Author : Snorri Gudmundsson
Publisher : Butterworth-Heinemann
Page : 1146 pages
File Size : 43,5 Mb
Release : 2021-10-31
Category : Business & Economics
ISBN : 9780128226476

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General Aviation Aircraft Design by Snorri Gudmundsson Pdf

General Aviation Aircraft Design, Second Edition, continues to be the engineer’s best source for answers to realistic aircraft design questions. The book has been expanded to provide design guidance for additional classes of aircraft, including seaplanes, biplanes, UAS, high-speed business jets, and electric airplanes. In addition to conventional powerplants, design guidance for battery systems, electric motors, and complete electric powertrains is offered. The second edition contains new chapters: Thrust Modeling for Gas Turbines Longitudinal Stability and Control Lateral and Directional Stability and Control These new chapters offer multiple practical methods to simplify the estimation of stability derivatives and introduce hinge moments and basic control system design. Furthermore, all chapters have been reorganized and feature updated material with additional analysis methods. This edition also provides an introduction to design optimization using a wing optimization as an example for the beginner. Written by an engineer with more than 25 years of design experience, professional engineers, aircraft designers, aerodynamicists, structural analysts, performance analysts, researchers, and aerospace engineering students will value the book as the classic go-to for aircraft design. The printed book is now in color, with 1011 figures and illustrations! Presents the most common methods for conceptual aircraft design Clear presentation splits text into shaded regions, separating engineering topics from mathematical derivations and examples Design topics range from the "new" 14 CFR Part 23 to analysis of ducted fans. All chapters feature updated material with additional analysis methods. Many chapters have been reorganized for further help. Introduction to design optimization is provided using a wing optimization as an example for the beginner Three new chapters are offered, two of which focus on stability and control. These offer multiple practical methods to simplify the estimation of stability derivatives. The chapters introduce hinge moments and basic control system design Real-world examples using aircraft such as the Cirrus SR-22 and Learjet 45

Aeroplane and Commercial Aviation News

Author : Anonim
Publisher : Unknown
Page : 564 pages
File Size : 42,9 Mb
Release : 1965
Category : Aeronautics
ISBN : STANFORD:36105117452511

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Aeroplane and Commercial Aviation News by Anonim Pdf

Airfoil Dynamic Stall and Rotorcraft Maneuverability

Author : Anonim
Publisher : Unknown
Page : 62 pages
File Size : 45,9 Mb
Release : 2000
Category : Electronic
ISBN : NASA:31769000634140

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Airfoil Dynamic Stall and Rotorcraft Maneuverability by Anonim Pdf

The loading of an airfoil during dynamic stall is examined in terms of the augmented lift and the associated penalties in pitching moment and drag. It is shown that once stall occurs and a leading-edge vortex is shed from the airfoil there is a unique relationship between the augmented lift, the negative pitching moment, and the increase in drag. This relationship, referred to here as the dynamic stall function, shows limited sensitivity to effects such as the airfoil section profile and Mach number, and appears to be independent of such parameters as Reynolds number, reduced frequency, and blade sweep. For single-element airfoils there is little that can be done to improve rotorcraft maneuverability except to provide good static clmax characteristics and the chord or blade number that is required to provide the necessary rotor thrust. However, multi-element airfoils or airfoils with variable geometry features can provide augmented lift in some cases that exceeds that available from a single-element airfoil. The dynamic stall function is shown to be a useful tool for the evaluation of both measured and calculated dynamic stall characteristics of singleelement, multi-element, and variable geometry airfoils.

JAR Professional Pilot Studies

Author : Phil Croucher
Publisher : Lulu.com
Page : 560 pages
File Size : 50,6 Mb
Release : 2004-03-01
Category : Aeronautics
ISBN : 9780968192825

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JAR Professional Pilot Studies by Phil Croucher Pdf

Ground study material for European pilot's written exams - aeroplanes & helicopter.

Nuclear Regulatory Commission Issuances

Author : U.S. Nuclear Regulatory Commission
Publisher : Unknown
Page : 208 pages
File Size : 42,7 Mb
Release : 2005-10
Category : Nuclear energy
ISBN : MINN:31951D025278841

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Nuclear Regulatory Commission Issuances by U.S. Nuclear Regulatory Commission Pdf

Experiment Station Record

Author : United States. Office of Experiment Stations
Publisher : Unknown
Page : 1348 pages
File Size : 49,6 Mb
Release : 1898
Category : Agricultural experiment stations
ISBN : HARVARD:HX3PHY

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Experiment Station Record by United States. Office of Experiment Stations Pdf

Agriculture in Some of Its Relations with Chemistry

Author : Francis Humphreys Storer
Publisher : Unknown
Page : 620 pages
File Size : 42,6 Mb
Release : 1897
Category : Electronic
ISBN : RUTGERS:39030041554306

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Agriculture in Some of Its Relations with Chemistry by Francis Humphreys Storer Pdf