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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.
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.
www.milehighgliding.com
/ref> 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
American X-Vehicles
(.pdf)
at GlobalSecurity.org
at HistoryNet.com
QT-2PC PRIZE CREW
{{X-planes 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
Development
The X-26A was used by the United States Navy to train test pilots in the condition of yaw/roll coupling. Sincejet
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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 Mile High Gliding in Boulder, Colorado./ref> 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
The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, t ...
(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
The NASA Neil A. Armstrong Flight Research Center (AFRC) is an aeronautical research center operated by NASA. Its primary campus is located inside Edwards Air Force Base in California and is considered NASA's premier site for aeronautical res ...
.
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
at GlobalSecurity.org
at HistoryNet.com
QT-2PC PRIZE CREW
{{X-planes 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