The language of aeronautics may not be familiar to you. Georges Delamare's dictionnaire en ligne d'aéronautique might be of some assistance (it includes 144 000 words or expressions, and may be downloaded on you HD for personal use).The dictionary is hosted on Pilotlist : you will find explanations about the theory of flight, and some answers to the many questions which may arise when reading theses stories : what is stalling, what is the angle of attack, what is the influence of load on flight performances, what is the use of feathering etc. Unfortunately for our English-speaking readers, all the explanations are given in French. An excellent account of the theory of flight may be found on Aviation History.
Pilot Friend : all about flying, including the history of technology (you fill find for instance detailed papers on air-cooled piston engines, from rotary to static radials
See also Terminology and Abbeviations of the Army Air Forces (over 500 abbreviations are listed).
Aircraft Engine Historical Society : for a better undestanding of some ot the following stories. All you need to know about piston engines, with technical data, diagrams, online articles
Design analysis of the P47 Thunderbolt : originaly published in the January 1945 issue of Industrial Aviation.
Aeronautics in Theory and Experiment : (1920) a rather dry and technical book, but an essential reading for the understanding of the state of art at the end of WWII. Much progress had been accomplished beween 1920 and 1940 (Million Book Project).
DjVu : download the plug-in
A History of Aeronautics by E. Charles Vivian (1920). Gutenberg Project : hence, only plain txt with no illustrations (some drawings would have been more than welcome), and no reference to the edition used for the conversion to a text file.

WW2 Forum : Shared by a number of websites. All WW2-related topics.

Preface, by Wally Hoffman
RAF
USAAF General
USAAF Fighters
USAAF Bombers Europe
USAAF Bombers Pacific
USAAF Training, Air control, POWs...

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