|This article needs additional citations for verification. (December 2008)|
|Role||Reconnaissance — Night|
|Manufacturer||Lockheed Missiles and Space Corporation|
|Primary user||United States Army|
|Developed from||Schweizer SGS 2-32|
The Lockheed YO-3 "Quiet Star" was an American single-engined, propeller-driven aircraft that was developed for battlefield observation during the Vietnam War. It was designed to be as quiet as possible, and was intended to observe troop movements in near-silence during the hours of darkness.
Design and development
The YO-3A was designed to a U.S. Army specification of 1968, which called for an observation aircraft that would be acoustically undetectable from the ground when flying at an altitude of 1,200 feet (355 m) at night.
Lockheed Missiles and Space Company located in Sunnyvale, California was contracted to produce two prototype aircraft. In 1966, the company built two QT-2 "Quiet Thrusters", using a modified [Schweizer SGS 2-32]] glider. The prototype QT-2s were then modified to the QT-2PC "PRIZE CREW" configuration. The QT-2PC had a silenced engine and a slow turning propeller for quiet operation. 
Following operational trials with the QT-2PC in Vietnam, a production aircraft, designated the YO-3A was ordered. This aircraft's design was also based on the Schweizer SGS 2-32 glider. Like the QT-2PC, the YO-3A has a large wingspan and a larger canopy area for observation. Two crew members (a pilot and a observer) are seated in tandem. The observer is located at the front of the cockpit. The YO-3 is a an all-metal low-wing monoplane of semi-monocoque construction. The control surfaces of the YO-3 including the the ailerons and rudder are fabric covered. The engine cover, canopy, engine exhaust shroud, wing-root fairings, and wheel-well fairings were constructed of fiberglass. The YO-3 has retractable tailwheel-type landing gear. 
The YO-3A was powered by an air-cooled, six-cylinder, horizontally opposed, fuel injected, Continental Model No. I0-360D engine. The engine is coupled to a slow turning propeller through a belt pulley-drive system. The propeller reduction ratio is 3.33:1. Originally equipped with a six bladed ground-adjustable-pitch propeller, this was replaced in March 1971 with a three bladed laminated constant speed wooden propeller produced by Ole Fahlin. The engine cowling and firewall were lined with fiberglass material to dampen and contain engine noise.
The YO-3A is equipped with an Asymmetrical Exhaust System. A crossover exhaust pipe is used to remove exhaust from the left bank of engine cylinders to the right side of the engine compartment. This crossover joins the right bank exhaust pipe and exits along the lower right side of the engine compartment. The exhaust gases are then moved through an acoustical fairing into a dissipating and resonating muffler continuing to the aft end of the fuselage.
Nine of the 11 YO-3As produced operated in South Vietnam, at night, from 1970 to 1971 (14 months) and never took a round or were shot down. The YO-3A was very successful in spotting movement by the North Vietnamese, but its deployment late in the American involvement in Vietnam reduced its value in that war. By early 1973 all American troops were out of Vietnam.
Following combat evaluation of the QT-2s in Vietnam by the Army, nine production YO-3As were sent to Long Thanh North, Vietnam, in 1970. Three were sent to Phu Bai Combat Base and two to Binh Thuy Air Base. Observations were initially made visually (80%), later followed on with a Night Vision Aerial Periscope developed by Xerox Electro-Optical of Pasadena, California. The mission equipment on the YO-3A was a Night Vision Aerial Periscope with infrared illuminator. One YO-3A was equipped with a laser target designator. The laser designator system was never used.
The YO-3A operated silently at 1,000 feet, or lower, depending on terrestrial background noise. Some pilots were known to have gone unobserved over the enemy at 200 feet. Occasionally, daylight flights were made over the rivers. Crew chiefs would monitor the YO-3A flying over the maintenance section prior to deployment, listening for rattles, whistles or other noises. The propeller, even at 500 feet over the maintenance area, made only a light flutter, heard just as it approached. This was followed by a light rushing of wind over the wings. There was no audible sound once the aircraft had passed over. If any abnormal noises were heard, the aircraft returned to the runway, where duct tape and other measures were employed to quiet noticeable sounds.
After Vietnam, two YO-3As, 69-18006 and 69-18007, were used by the Louisiana Department of Fish and Game. The aircraft was effective at catching poachers. The FBI eventually acquired the aircraft, and operated the type for several years, assisting the apprehension of kidnappers and extortionists.
NASA took possession of one YO-3A, 69-18010. Following service with the U.S. Army this aircraft was transferred to an airframe and powerplant mechanics school. NASA's Ames Research Center located at Moffett Federal Airfield in California acquired the YO-3A from the school in 1977. NASA equipped the aircraft with wing-tip and tail-mounted microphones. These microphones were used to record the in-flight acoustic signatures of a variety of U.S. Army helicopters and Tiltrotor aircraft. The YO-3 was also used to measure sonic booms from the Lockheed SR-71 Blackbird. In 1997, the NASA YO-3A was transferred to the Dryden Flight Research Center (now Armstrong Flight Research Center) at Edwards Air Force Base, in California. The YO-3A remained in a flyable storage state until October 2004. Then the YO-3A was flown back to Ames to support rotorcraft research again for nearly two years before once again returning to Dryden. In 2015, the aircraft was retired by NASA and sold by the General Services Administration at auction to the Vietnam Helicopters Museum. 
- QT-1 Quiet Thrust
- Prototype single-seat glider conversion
- QT-2PC PRIZE CREW
- Two-seat version, two built for combat evaluation
- One-aircraft for propeller development
- Production aircraft for the United States Army, 11 built
- 18000 is on display at the United States Army Aviation Museum located at Fort Rucker, Alabama.
- 18001 is on display at the Hiller Aviation Museum located in San Carlos, California.
- 18005 is on display at the Museum of Flight at Boeing Field in Seattle, Washington.
- 18006 is on display at the Pima Air & Space Museum, located in Tucson, Arizona.
- 18007 is currently in storage at the Western Museum of Flight in Torrance, California.
- 18010 is currently in storage at the Vietnam Helicopters Museum located in Concord, California.
- Crew: 2
- Length: 29 ft 4 in (9.093 m)
- Wingspan: 57 ft (17.374 m)
- Height: ()
- Wing area: 213.1 ft2 (19.797 m2)
- Aspect ratio: 1:7 at 80kts IAS
- Max. takeoff weight: 3800 lb (1,723.653 kg)
- Maximum speed: 103 mph (165.762 km/h)
- Cruise speed: 80.6 mph (126.64 km/h)
- Stall speed: 64.4 mph (119.27 km/h)
- "QT-2PC PRIZE CREW". Retrieved 2015-05-03.
- "YO-3A “Quiet Star” Silent Stealth Airplane". Vietnam Helicopters Museum. Retrieved 2015-05-02.
- Andrade 1979, p. 140.
- Peter Merlin, Public Affairs NASA Armstrong Flight Research Center. "Quiet Research Aircraft Retires to California Museum". NASA Armstrong Flight Research Center Website. Retrieved 2015-05-02.
- Andrade, John. U.S. Military Aircraft Designations and Serials since 1909. Hinckley, UK: Midland Counties Publications, 1979. ISBN 0-904597-22-9.
- The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). London: Orbis Publishing, 1985.
- Munson, Kenneth. Bombers in Service, Patrol and Transport Aircraft Since 1960. London: The Macmillan Co., 1972. ISBN 978-0-71370-586-7.
|Wikimedia Commons has media related to Lockheed YO-3.|
- Lockheed's Combined Sailplane & Slow-Turning Propeller at HistoryNet.com
- Quiet Aircraft Association
- QT-2PC PRIZE CREW
- Lockheed QT-2 / Q-Star / YO-3A 1971 at the Virtual Aircraft Museum ]
- Lockheed YO-3A Quiet Start: The Original Stealth Aircraft of the Vietnam War]
- YO-3A Acoustic Research Aircraft Image Gallery