Designation: YO-3A

Lockheed YO-3A

Lockheed YO-3A Quietstar

A picture of the Lockheed YO-3A Quietstar

The YO-3A was designed to provide a very quiet aircraft for low-altitude, night reconnaissance flights over Vietnam.  Lockheed based the plane on a Schweizer SGS 2-32 sailplane.  The gliders were heavily modified to add a specially muffled engine and a slow-turning three-blade propeller.  Flying at 2,000 feet and using night vision equipment the Quietstar tracked North Vietnamese troop movements without the people on the ground ever even hearing the aircraft.  After their service in Vietnam YO-3As were used by NASA for studies of aircraft noise, by the Louisiana Department of Wildlife and Fisheries for tracking poachers, and by the Federal Bureau of Investigation.

Wingspan 57 ft

Wingspan

Length 29 ft 4 in.

Length

Height 9 ft 1 in.

Height

Weight 3,519 lbs (loaded)

Weight

Max. Speed 138 MPH

Maximum Speed

Service Ceiling 14,000 ft

Service Ceiling

Range 500 miles

Range

Engines One Continental IO-360D six-cylinder engine with 210 horsepower

Engine

Crew 2

Crew


Manufacturer
Lockheed

Markings
U.S. Army, 73rd Aviation Company, South Vietnam, 1970

Designation
YO-3A

Registration
N14425

Serial Number
69-18006

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