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The Curtiss XBT-4 was the designation given to a single O-1E Falcon when it was converted to act as a possible basic trainer. The conversion was carried out in June 1930, soon after the introduction of the Basic Trainer classification, and was similar in concept to the Douglas BT-1 (based on the Douglas O-2K) and the Douglas BT-2 (based on the O-32). It was produced as Curtiss's entry into an Army Basic Trainer competition that was launched in 1929. Although the BT-4 was slightly lighter than the O-1E, its speed actually fell very slightly. The Army didn't place any orders for the BT-4, and the sole example was converted into the XO-1G
Engine: Curtiss V-1150E liquid cooled engine
Power: 435hp
Crew: 2
Span: 38ft
Length: 27ft 2in
Height: 10ft 6in
Gross weight: 4,146lb
Max speed: 140mph