It must have been white knuckle time for those aboard the Canadian Pacific Douglas DC-8. Going supersonic in an airliner not designed for flight above the speed of sound certainly has an element of risk.

Health and safety regulations today might prevent such a flight, but back in the 1960s things were different. Test pilot Bill Magruder had the idea and so the decision was made – let’s try to get the DC-8 above Mach 1 on a test flight.

A Supersonic Douglas DC-8

Why would they do this? Well, to show that the plane wouldn’t fall apart at such speeds, of course! The people at Douglas decided to use an aircraft destined for Canadian Pacific, which was registered N9604Z in flight testing. It was a Douglas DC-8-42, powered by four Rolls-Royce Conway engines.

The date set was 21 August 1961 and the aircraft took off from Long Beach and headed to Edwards Air Force base. With fuel on board for a half hour flight, Bill took the DC-8 up to a record 52,000 feet and pushed the plane over into a dive.

At around 45,000 feet, supersonic flight was achieved with the aircraft reaching Mach 1.01 for about 16 seconds. After some hairy moments pulling out of the dive, the aircraft landed safely. The executives at the company were quite pleased and the flight test team all received a US$1,000 bonus for their efforts, a wad of cash at a time when the average annual salary was US$5,700.

Overall Thoughts

The full story about the supersonic Douglas DC-8 is in Air & Space Magazine online here. Flight test engineer Richard H. Edwards gives a first hand account of the flight, and it’s well worth the read.

After the flight, the aircraft was delivered to Canadian Pacific on 15 November 1961 and received the Canadian registration CF-CPG. First it was named Empress of Montreal and later Empress of Buenos Aires with CP Air (as the airline became known). It was withdrawn from service in 1980 and scrapped the following year.

Did you know that a Douglas DC-8 had gone supersonic? Thank you for reading and if you have any comments or questions, please leave them below.

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Featured image via Skythings on Diecast Aviation Forum.
Canadian Pacific ground shot via The Mighty Eight.
Inflight with F-104 via The Aviation Geek Club.