VT-51

VT-51
Name	VT-51
Type	Experimental aircraft
National origin	United States
Manufacturer	Vought
First flight	1945
Status	Experimental project
Primary user	United States Navy

VT-51. The VT-51 was an experimental tail-sitter VTOL aircraft developed by Vought for the United States Navy in the mid-1940s. Conceived during a period of intense innovation in aviation technology following World War II, it represented an early and ambitious attempt to create a practical vertical take-off and landing fighter. The program, however, was short-lived, facing significant technical challenges and ultimately being canceled after the construction of a single non-flying prototype.

Overview

The VT-51 project emerged from the United States Navy's post-war interest in developing aircraft that could operate without the need for long aircraft carrier decks. This initiative was part of a broader exploration of VTOL and STOL concepts by several aerospace manufacturers, including Convair and Lockheed Corporation. The design was a direct response to a Navy specification for a compact fighter that could be deployed from smaller vessels or austere shore bases, potentially changing naval aviation tactics. As a tail-sitter, the aircraft was designed to take off and land on its tail, a configuration also explored in contemporary projects like the Convair XFY Pogo and the Lockheed XFV.

Design and development

The VT-51 was designed by a team at Vought's facility in Dallas, Texas, leveraging the company's experience with naval aircraft like the F4U Corsair. Its most distinctive feature was the tail-sitter configuration, with the aircraft resting on a set of extensible landing gear attached to its tail surfaces. Power was supplied by a single Allison T40 turboprop engine, a powerful new powerplant that drove two large, contra-rotating propellers mounted in the nose. The airframe was relatively compact, with a short fuselage and straight wings to facilitate the vertical attitude during landing. The cockpit was designed with a complex instrumentation layout to aid the pilot during the difficult transition between vertical and horizontal flight, a major engineering challenge of the era.

Operational history

The operational history of the VT-51 was extremely limited, as the program never progressed beyond ground testing. The sole prototype, often referred to by its Bureau of Aeronautics designation, was used for extensive ground runs and tethered testing to evaluate the powerplant and control systems. The project was hampered by the developmental problems associated with the innovative Allison T40 engine, which also plagued other aircraft like the Douglas A2D Skyshark. Furthermore, the fundamental difficulties of controlling a tail-sitter aircraft, particularly during the critical landing phase, proved immense. With the shifting priorities of the Korean War era and the success of more conventional jet aircraft, the United States Navy canceled the VT-51 program in the early 1950s before the prototype ever achieved free flight.

Variants

Only one variant of the VT-51 was built. The project did not advance sufficiently to warrant the development of different models or dedicated trainer versions. Some design studies and proposals for improved versions with more powerful engines or refined control systems were likely discussed internally at Vought, but none were authorized for construction. The concept's inherent challenges meant that resources were not allocated for further evolution beyond the initial prototype.

Operators

The only intended and potential operator of the VT-51 was the United States Navy. The aircraft was developed under a Navy contract and was evaluated by Navy personnel, including test pilots from Naval Air Station Patuxent River. No units were ever equipped with the type, and the prototype never entered service with any squadron or air wing. The project remained entirely within the realm of experimental military research and development.

Specifications (VT-51)

* **Crew:** 1 * **Powerplant:** 1 × Allison T40-A-2 turboprop, driving contra-rotating propellers * **Wingspan:** Approximately 25 ft (7.6 m) * **Length:** Approximately 30 ft (9.1 m) * **Max takeoff weight:** Estimated 10,000 lb (4,500 kg) * **Performance (estimated):** Maximum speed: 400 mph (640 km/h); Service ceiling: 30,000 ft (9,100 m) * **Armament (proposed):** 4 × 20 mm Hispano-Suiza HS.404 cannon or unguided rockets

Category:Abandoned military aircraft projects of the United States Category:VTOL aircraft Category:Vought aircraft Category:United States experimental aircraft 1940–1949