The General Dynamics F-16XL was a derivative of the F-16 Fighting Falcon, with a cranked-arrow delta wing. It was originally conceived as a technology demonstrator, later entered the United States Air Force’s (USAF) Enhanced Tactical Fighter (ETF) competition but lost to the F-15E Strike Eagle. Several years after the prototypes were shelved, they were turned over to NASA for additional aeronautical research. Both aircraft are currently stored at Edwards AFB.
21 September 1956 – Grumman company test pilot Tom Attridge shoots himself down in a Grumman F-11F Tiger, BuNo 138260, during a Mach 1.0 20 degree dive from 22,000 feet. Tom fires two bursts from the fighter’s 20mm cannon during the descent, and as he reaches 7,000 feet (2,100 m) the jet is struck multiple