The Bell 533 was a research helicopter built by Bell Helicopter under contract with the United States Army during the 1960s, to explore the limits and conditions experienced by helicopter rotors at high airspeeds.

The Bell 533 was a research helicopter built by Bell Helicopter under contract with the United States Army during the 1960s, to explore the limits and conditions experienced by helicopter rotors at high airspeeds.

On 6 April, 1965, the Model 533 flew at 402km/h in level flight and 409km/h in a shallow dive. It showed also its outstanding manoeuvrability in performing 2g turns and 60deg banks at speeds around 320km/h, and a Mach number of 0.985 was recorded by the advancing blades of the rotor.

Dec 13, 2017 · An early-model Huey was outfitted with wing mainplanes and fuselage-mounted jet engines for added propulsion to become the Bell Model 533 - also known as the "High Performance Helicopter". Bell Helicopter satisfied the U.S. Army requirement for the project and the two teamed up to bring the Model 533 to fruition in August of 1961.

Jun 28, 2021 · The Bell 533 was referred to as the High Performance Helicopter (HPH) by the Army, and reached a top speed of 274.6 knots (508.6 km/h; 316.0 mph) in 1969, before being retired....

Aug 13, 1976 · The Bell 533, 56-9723, in on3 of its many configurations. It was flown with two- and four-bladed main rotors, with and without wings, and with and without turbojet engines. (Bell Helicopter Corporation)

Army to test the limits of high-speed rotorcraft with combined engine configurations. Early Huey models were fitted with wing main aircraft and fuselage mounted jet engines to provide additional propulsion, becoming the Bell 533 - also known as the "High Performance Helicopter".

The Bell 533 was built in 1959 from the first YH-40 (one of six pre-production aircraft that led to the UH-1) in response to a request from the United States Army's Transportation Research Command for a vehicle to test emerging rotorcraft technologies.

Converted by Bell with modified rotor mast inside a redesigned fairing, a modified vertical tail unit, and extensive streamiling, resulting in level flight speeds of over 170 mph and 180 mph in shallow dives. Later equipped with two 920-lbst turbo-jet engines (one on either side of …

Aug 10, 2021 · As a leader in HSVTOL technology, Bell has pioneered innovative VTOL prototypes like the X-14, X-22, XV-3, XV-15, Bell 533, TR911X and many others.