The Barkley-Grow T8P-1 was an airliner developed in the United States shortly before the Second World War. Although it saw limited production, the type was well-received as a bush plane in Canada. Typical for the era, the Barkley-Grow T8P-1 was a low-wing monoplane of all-metal construction with a twin tail (an additional third tail was installed, à la Lockheed Constellation, when fitted with floats). The T8P (standing for Transport, 8 Passenger) was designed to be simple and rugged, thus the main units of the tailwheel undercarriage were not retractable, and this may have negatively impacted the type's reception in the marketplace. A novel design feature, however, was the wing structure. Barkley used what might be called a "horizontal cell" technique that has no ribs or spars. Long tapered strips of aluminium were bent to form V shapes which were then riveted tip to tip to form an "X". These "X"s are riveted inside the wing side by side to produce the long "cells". This wing structure was unique to the Barkley-Grow and according to mechanics who worked on the aircraft it was very light, very stiff, very expensive to build, and difficult to repair if damaged, but it gave no problems in service. Like its two main competitors, the Lockheed Model 12 Electra Junior and the Beech 18, the T8P-1 was originally designed to a 1935 Bureau of Air Commerce specification (eventually won by the Lockheed entry). Sales in the US were disappointing, only 11 being built, and most machines (seven) were sold to Canada, where the fixed undercarriage was no obstacle to the fitting of skis or pontoons. One was selected for a record flight from Washington D.C. to Peru, and another was used in the Antarctic by the US Navy.
