The objective of this Aeronautical Engineer’s Data book is to provide a concise and useful source of up-to-date information for the student or practising aeronautical engineer. Despite the proliferation of specialized information sources, there is still a need for basic data on established engineering rules, conversions, modern aircraft and engines to be available in an easily assimilated format. An aeronautical engineer cannot afford to ignore the importance of engineering data and rules. Basic theoretical principles underlie the design of all the hardware of aeronautics. The practical processes of fluid mechanics, aircraft design, material choice, and basic engineering design form the foundation of the subject. Technical standards, directives and regulations are also important – they represent accumulated knowledge and form invaluable guidelines for the industry.