Mile High Gliding in Boulder, Colorado. The Q-Star was the first aircraft to use a rotary combustion chamber (Wankel) engine. It is currently being returned to flight status. The YO-3As were tactically evaluated in Southeast Asia from mid-1969 to late 1971. They were later used by the Louisiana Dept of Wildlife & Fisheries (LDWF) and the Federal Bureau of Investigation (FBI) in law enforcement, and by NASA for scientific applications. YO-3A 69-18005 is on display at the Museum of Flight in Seattle, Washington. YO-3A 69-18006 is on display at the Pima Air and Space, Tucson AZ. YO-3A 69-18007 is in storage at the Western Museum of Flight in Torrance, California. As of 2014, YO-3A 69-18010 (NASA 818) is in flyable storage at Armstrong Flight Research Center. Accidents U.S. Navy 157932 crashed March 1971, pilot killed. U.S. Navy 157933 crashed May 18, 1972, pilot killed. Specifications (X-26A Frigate) Specifications (X-26B and QT-2PC) See also Notes References American X-Vehicles (.pdf) External links X-26A Frigate (Schweizer SGS 2-32) / X-26B (Lockheed) at GlobalSecurity.org Lockheed’s Combined Sailplane & Slow-Turning Propeller at HistoryNet.com QT-2PC PRIZE CREW X-026 Glider aircraft 1960s United States experimental aircraft 1960s United States sailplanes 1960s United States military reconnaissance aircraft Mid-wing aircraft Aircraft first flown in 1967