Redfern used a Stinson Detroiter SM-1, a high-wing monoplane with a Wright  J-5 “Whirlwind” engine, the same type of motor used on “Lucky Lindy's” Spirit of St. Louis.  According to the publication Aircraft Circulars, National Advisory Committee for Aeronautics, prepared by the Stinson Aircraft Corporation, and published in Washington in 1927,  “The Stinson Model SM-1 was the first monoplane of the illustrious ‘Detroiter’ series and successor to the popular SB-1 cabin biplanes (Ed. Note: It was also the first aircraft to be fitted with a Diesel engine. See here and here). The first SM-1 ever built won the 1927 Ford Air Tour, flown by Eddie Stinson himself. Thirty-six planes were reported built in 1927, and many were used in attempts to set world records. Although comparatively large, the SM-1 performed and handled well and could be landed in the traditional cow pasture. The factory price was $12,000 to $12,500 and included such standard equipment as inertia-type engine starter, metal propeller, wheel brakes and wings wired for navigational lights. Pontoons were also available.”

Redfern went to the Stinson Aircraft Factory in Detroit to supervise the installation of additional fuel tanks and other modifications in the Stinson Detroiter. "With Eddie Stinson in the second seat, Paul took off in the modified Stinson at 9:40 a.m. on August 5 and reached Brunswick, Georgia, at 7:40 p.m. He averaged 86 miles an hour on this non-stop flight,” according to Redfern's father.  John Underwood states in his book, The Stinsons -- A Pictorial History, that Eddie Stinson tried to persuade Redfern that two days of flying "was more than a man could stand." He was unable, however, to convince Redfern to take another pilot with him.