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Phoenix666 writes:

NASA has posted freely available e-books on aeronautics on their website that might be of interest to flight enthusiasts.

Titles include:

• Unlimited Horizons: Design and Development of the U-2. Over the span of more than six decades, the U-2 evolved from a relatively basic, high-altitude camera platform for performing clandestine reconnaissance missions into a complex, multisensor platform that has been adapted for a multitude of civil and military roles. Variants in more than a dozen configurations have been used for intelligence gathering, strategic and tactical reconnaissance, communications relay, battle-damage assessment, treaty monitoring and verification, disaster relief, environmental and Earth resources studies, and a wide variety of scientific research.
• Elegance in Flight: A comprehensive History of the F-16XL Experimental Prototype and its Role in NASA Flight Research
• Probing the Sky: Selected NACA Research Airplanes and Their Contributions to Flight
• Flying Beyond the Stall
• Cave of the Winds
• A New Twist in Flight Research: The F-18 Active Aeroelastic Wing Project

Original Submission