The X-26 Frigate is the longest-lived of the X-plane programs. The program included the X-26A Frigate sailplane and the motorized X-26B Quiet Thruster versions: QT-2, QT-2PC, and QT-2PCII. All were based on the Schweizer SGS 2-32 sailplane. Development The X-26A was used by the United States Navy to train test pilots in the condition of yaw/roll coupling. Since jet trainers were known to be dangerous in this condition, the X-26 was based on the Schweizer SGS 2-32 sailplane. Sailplanes react much slower and are easier to control than jet aircraft, making the X-26 a much safer training platform. Four aircraft were originally ordered. Three of the original planes crashed. The Navy purchased a replacement for each of the crashed units. Operational history Two Schweizer 2-32s, 67-15345 and 67-15346, from the U.S. Naval Test Pilot School X-26 Program, were modified to QT-2 configuration (QT for Quiet Thruster) by the Lockheed Missiles & Space Company and civil registered as N2471W and N2472W. In 1967 the aircraft were modified by adding a Continental O-200 engine, V-Belt RPM reduction system, four-bladed Fahlin fixed pitch wooden propeller, and associated airframe upgrades. After demonstrating quiet flight, the aircraft were again modified to military QT-2PC configuration, known only as Tail Numbers "1" and "2", with avionics and camouflage for night operation. They were successfully evaluated in Southeast Asia under the Prize Crew OpEval program for covert ("stealthy") tactical airborne observation in the spring of 1968 (during Têt). The two QT-2PCs were returned to the Test Pilot School in 1969 and re-designated X-26Bs. The #1 QT-2PC was re-designated "67-15345" and the #2 aircraft was used for spare parts. The original X-26 glider version was then designated X-26A. Lockheed continued the covert airborne surveillance program with one Q-Star (House Test Aircraft) and eleven pre-production YO-3As. Surviving aircraft Both of the aircraft from the original QT-2 / X-26B program survive today. The X-26B aircraft known as QT-2 N2471W and QT-2PC #1 is located (as of 2019) in the collection of the US Army Aviation Museum at Ft. Rucker AL. The original N number N2471W was reassigned in 2019 to another Schweizer SGS 2-32 glider, (serial #7, formerly N2758Z) owned by Mile High Gliding of Boulder Colorado. The second X-26B aircraft known as QT-2 N2472W and QT-2PC #2 was restored to SGS 2-32 configuration and has been operated for many years (and known as "72 Whiskey") for paid scenic rides at