Bell 533

The Bell 533 was a research helicopter built by Bell Helicopter to explore the limits and conditions experienced by helicopter rotors at high airspeeds under contract with the United States Army during the 1960s. The helicopter was a YH-40—a pre-production version of the UH-1 Iroquois—modified and tested in several helicopter and compound helicopter configurations.

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The Bell 533 was a research helicopter built by Bell Helicopter to explore the limits and conditions experienced by helicopter rotors at high airspeeds under contract with the 2

Made by Bell Helicopter.

It is the successor of the Bell UH-1 Iroquois .

The Bell 533 was an experimental helicopter used by Bell Helicopters to test new technologies and product developments.3
Finally, the Bell 533 reached a top speed of 274.6 knots (316.0 mph, 508.6 km/h) in 1969, but it too was a one-off research test bed as well.4
Developed From
Bell UH-1 Iroquois
Predecessor
Bell UH-1 Iroquois
Category
Compound helicopters
Military helicopters
United States experimental aircraft 1960-1969
Lists
* List of VTOL aircraft
Manufacturer
Bell Helicopter
Similar Aircraft
* Lockheed XH-51* Sikorsky S-69 * Sikorsky S-72
Number Built
One
Related
* UH-1 Iroquois
First Flight
10
Primary user
United States Army
Status
On display
Fort Eustis
Virginia
National Origin
United States
See Also
* Gyrodyne

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