WOW - A Boeing 707 upside down! "The Famous Boeing 707 Prototype Barrel Roll Over Lake Washington" On Aug. 7, 1955, Boeing’s chief test pilot, the legendary Alvin “Tex” Johnston, pulled an impressive stunt in the prototype of the Boeing 707. At a speed of 490 miles an hour, he flew the 248,000-pound aircraft upside down. An engineer managed to capture the moment on camera where you can see the engine overlooking Washington city This was the Boeing's entry into the commercial jet age. | Ireland W