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[1] [4] A stick & tissue balsa model airplane under construction, still manufactured by Guillow's. During World War II, the supply of balsa wood was diverted to the war effort for the manufacture of rafts and life jackets. Guillow's was forced to use alternative materials like cardboard or pine wood to manufacture the model kits.
The first experimental aircraft specification, for a transonic rocket plane, was placed in 1945, and the first operational flight of an X-plane took place when the Bell X-1 made its first powered flight nearly three years later at Muroc Air Force Base, California, now known as Edwards Air Force Base. [3]
As used here, an experimental or research and development aircraft, sometimes also called an X-plane, is one which is designed or substantially adapted to investigate novel flight technologies. [ 1 ] [ 2 ] [ 3 ]
First flight of the full-sized aircraft was originally forecast in 2009 for 2010, but by July 2012 only a 1/4 scale model had been flown. [ 3 ] [ 5 ] In February 2014 the design had passed through the final round of wind tunnel testing, and in March 2014 the first carbon fiber parts were made for the conforming flying prototype.
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[1] [2] Alberto Santos-Dumont was the first to offer for free construction plans, publishing drawings of his Demoiselle in the June 1910 edition of Popular Mechanics. [6] The first aircraft to be offered for sale as plans, rather than a completed airframe, was the Baby Ace in the late 1920s. [7]
DARPA launched the project in mid-2022, wanting a plane that could lift large, heavy loads by skimming the water in ground effect, and capable of operating at mid-altitudes of up to 10,000 feet (3,000 m). Utilizing the ground effect, flying at an altitude equal to 5% of the wingspan can deliver 2.3 times more efficient flight performance.
A model of the Transonic Truss-Braced Wing aircraft in a wind tunnel at NASA's Ames Research Center. By early 2019, following extensive wind tunnel testing at NASA Ames Research Center, an optimized truss and more sweep for the 170 ft (52 m) span wing allowed flying higher and faster, up from Mach 0.70–0.75 to Mach 0.80 like current jetliners. [3]