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....

1962 : Bell 533 HPH The US Army High Performance Helicopter was a YH-40 modified for research with sweptback wings and side-mounted turbojet engines. Reached a top speed of 274.6 knots (316.0 mph, 508.6 km/h) in 1969, before being retired.

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".

El Bell 533 fue un helicóptero experimental construido por Bell Helicopter para explorar los límites y las condiciones experimentadas por los rotores de helicóptero a altas velocidades, bajo un contrato con el Ejército de los Estados Unidos, durante los años 1960.El helicóptero era un unidad de preproducción YH-40 del UH-1 Iroquois modificada y probada en varias configuraciones de ...

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.

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.