Monday at the Museum: 14 X-planes at the National Museum of the U.S. Air Force

The "X" classification in research and development simply marks an invention's current use as "experimental." Some such inventions make it beyond that stage; the majority of those that follow did not. Whatever their contributions to aeronautics in the United States, these X-planes can be appreciated for their interesting designs. 1. The Avrocar Actually Canadian in …

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