Northrop YF-17 lost the US Air Force’s Lightweight Fighter contest but evolved into the F/A-18…
Hughes XV-9 tested hot-cycle propulsion with tip-jet rotors in the 1960s, proving the concept but…
Promavia Jet Squalus was a lightweight multi-role trainer designed for military and civilian use, but…
Waco Model W Aristocraft was an unconventional postwar light aircraft with innovative design, but despite…
Boeing Skyfox aimed to modernize the aging T-33 into a low-cost jet trainer with better…
Tupolev Tu-110 was a four-engine Soviet jetliner developed from the Tu-104 but canceled in 1958…
Boeing XB-15, a 1930s “super bomber,” set payload records but was canceled due to low…
Cierva W.9 tested a tail-rotorless helicopter concept during WWII, pioneering early NOTAR ideas before its…
Bristol XLRQ aimed to give US Marines amphibious glider capability in WWII, but shifting doctrine…
Bernard H.V.220 aimed to compete in the 1931 Schneider Trophy, but engine failures and delays…
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