I am thinking if the project needs a low cost quiet low level reconnaissance aircraft they might have Lockheed YO-3 "Quiet Star"
Lockheed YO-3 "Quiet Star"
General characteristics
Crew: Two
Length: 30 ft 0 in (9.14 m)
Wingspan: 57 ft 0 in (17.37 m)
Wing Area: 180 sq. ft. (16.70 sq. m)
Powerplant: 1 × Continental six-cylinder horizonally-opposed, 210
Source
http://en.wikipedia.org/wiki/Lockheed_YO-3