RR-5

The RR‑5 is a twin‑engine, turboprop research aircraft developed by Ford Aerospace in the early 1970s as part of the company’s effort to diversify beyond its well‑known automotive ventures. The project began in 1971 after Ford’s aerospace division secured a contract from the U.S. Air Force to explore high‑altitude, long‑duration flight for atmospheric sampling and remote‑sensing missions. The prototype rolled out in 1974 and first flew on 12 March 1975, entering limited service with the Air Force Test Center in 1977.

Key features include a lightweight composite airframe, a variable‑geometry wing that can be adjusted in flight to optimise lift‑to‑drag ratio, and a pair of Pratt & Whitney PT6A‑67D turboprop engines delivering 1,600 shaft horsepower each. Advanced avionics, a fly‑by‑wire control system, and an integrated data‑acquisition suite allowed researchers to conduct continuous measurements up to 45,000 feet for more than 20 hours.

The RR‑5’s significance lies in demonstrating that a commercial‑spun aerospace program could produce an aircraft capable of both scientific research and maritime patrol roles. Its design principles influenced later tilt‑rotor and unmanned aerial platforms, cementing Ford Aerospace’s brief but impactful contribution to modern aviation technology.