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I had been searching for a handbook like this for a while wanted to post the link for it here so others can benefit from it and add links to similar no fee handbooks.  It's useful for traditional heli and multicopter UAV pilots that want reference material.

http://www.faa.gov/library/manuals/aircraft/media/faa-h-8083-21.pdf

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Preface

The Rotorcraft Flying Handbook is designed as a technical manual for applicants who are preparing for their private, commercial, or flight instructor pilot certificates with a helicopter or gyroplane class rating. Certificated flight instructors may find this handbook a valuable training aid, since detailed coverage of aerodynamics, flight controls, systems, performance, flight maneuvers, emergencies, and aeronautical decision making is included.

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Feel free to add links to similar no fee publications.