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The Bell 47 is a single-rotor single-engine light helicopter manufactured by Bell Helicopter. It was based on the third Bell 30 prototype, which was the company's first helicopter designed by Arthur M. Young. The 47 became the first helicopter certified for civilian use on 8 March 1946.
In March 1957 two Bell 47Js were bought by the United States Air Force as presidential transport and designated H-13J. [1] On 13 July 1957 a H-13J was the first helicopter used by a United States president when it carried Dwight D. Eisenhower from the White House. [1]
Bell 47: 1945 5,600 Single piston engine helicopter Bell D-35: 1945 0 Twin engine flying wing fighter with reaction jet for aircraft control Bell X-1: 1946 7 Experimental single rocket engine airplane Bell XH-15: 1948 3 Prototype single piston engine utility helicopter Bell X-5: 1951 2 Experimental single jet engine airplane Bell X-2: 1952/1955 2
The fuel economy in aircraft is the measure of the transport energy efficiency of aircraft. ... 5.47 L/100 km (43.0 mpg ‑US) [58] ATR 42-500: 1995: 48
This engine produced 425 shp (317 kW), yet it weighed so little that it had to be mounted behind the helicopter's fuel tanks and rotor mast for weight-and-balance reasons. The light weight of turbines made them ideal for helicopters, whose performance had long been constrained by the low power-to-weight ratios of piston engines. Turbine power ...
In 1960, the US Army settled for a rotary wing platform. The YT63-A-3 first flew in a variant of the Bell 47 helicopter in 1961. A modified version of the engine (YT63-A-5) with the exhaust pointing upwards (to avoid grass fires) soon followed. This version, rated at 250 hp, passed the Model Qualification Test in September 1962.
Turbocharged, vertically-mounted engine model for helicopters, with a dry sump oil system and a different automatic waste gate control setting for a higher power rating. It produces 280 hp (209 kW) at 3200 rpm for takeoff, with a compression ratio of 7.3:1, a dry weight of 465 lb (211 kg) and fitted with a Marvel-Schebler MA-6AA carburetor.
The T55 serves as the engine on several major applications including the CH-47-Chinook, the Bell 309, and the Piper PA-48 Enforcer. The T55 also serves as the core of the Lycoming ALF 502 turbofan . Since the T55 was first developed, progressive increases in airflow , overall pressure ratio, and turbine inlet temperature have more than tripled ...