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Bell 533 High Performance Helicopter. It reached a top speed of 274.6 knots (508.6 km/h; 316.0 mph) in 1969 making it the fastest compound helicopter in the world. : r/WeirdWings
![On the Horizon: New Aircraft Feature Fresh Tech and Capabilities | Aerospace News: Aviation International News On the Horizon: New Aircraft Feature Fresh Tech and Capabilities | Aerospace News: Aviation International News](https://www.ainonline.com/sites/default/files/styles/app_large_full/public/uploads/2022/12/bell-525-ship-15-62015-e0e2de-original-1612805543.jpg?itok=Fw0ul-aY)
On the Horizon: New Aircraft Feature Fresh Tech and Capabilities | Aerospace News: Aviation International News
![Bell Unveils Sleek, Stealthy New Attack-Recon Helicopter - Warrior Maven: Center for Military Modernization Bell Unveils Sleek, Stealthy New Attack-Recon Helicopter - Warrior Maven: Center for Military Modernization](https://warriormaven.com/.image/ar_4:3%2Cc_fill%2Ccs_srgb%2Cfl_progressive%2Cq_auto:good%2Cw_1200/MTkwOTAzNTc5MDU2NDgxODc3/bell_360_dsc09419.jpg)
Bell Unveils Sleek, Stealthy New Attack-Recon Helicopter - Warrior Maven: Center for Military Modernization
![U.S. Army Selects Bell and Sikorsky/Boeing to Build Prototypes for Next Generation Helicopter Program - USNI News U.S. Army Selects Bell and Sikorsky/Boeing to Build Prototypes for Next Generation Helicopter Program - USNI News](https://news.usni.org/wp-content/uploads/2014/10/image.jpg)