Beechcraft's Model 34 Twin-Quad stands as the largest aircraft ever produced by the company, despite never entering commercial production. Developed between the late 1940s and early 1950s, it was designed to serve as a regional airliner capable of carrying up to 20 passengers.
The Twin-Quad featured a unique V-tail design and was powered by four Pratt & Whitney R-985 radial engines, each producing 450 horsepower. This configuration promised enhanced safety and power for its size. The first prototype took flight on October 1, 1947, but the project faced challenges due to a post-war surplus of military aircraft and competition from established models like the Douglas DC-3.
According to History.net, these factors hindered the Model 34's market success. Beechcraft eventually shelved the project in the early 1950s after producing just one prototype. Despite this, it left a lasting impression as a symbol of Beechcraft's innovation.