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The Eurocopter X³ (X-Cubed) is a retired experimental high-speed compound helicopter developed by Airbus Helicopters (formerly Eurocopter).A technology demonstration platform for "high-speed, long-range hybrid helicopter" or H³ concept, [1] the X³ achieved 255 knots (472 km/h; 293 mph) in level flight on 7 June 2013, setting an unofficial helicopter speed record.
[2] [32] The demonstrator then reached a new record speed of 260 knots (300 mph; 480 km/h) in a shallow 2˚ to 3˚ dive, [33] which was just short of the 303 mph achieved by the Sikorsky S-69 technology demonstrator helicopter. [34] Sikorsky states that the X2 has the same noise level at 200 knots that a regular helicopter has at 100 knots.
Uncrewed torpedo speed claims range from 60 knots (110 km/h; 69 mph) for the British Spearfish torpedo [64] to 200 knots (370 km/h; 230 mph) for the Russian VA-111 Shkval. [ 65 ] ^ a b Ground effect vehicles (a.k.a. "Wing-In-Ground effect vehicles") are classified as maritime vessels, rather than aircraft, by the International Maritime ...
The Airbus RACER (Rapid and Cost-Effective Rotorcraft) is an experimental high-speed compound helicopter developed by Airbus Helicopters from the Eurocopter X³. It was revealed at the June 2017 Paris air show, final assembly slated to start in mid-2020 for a 2021 first flight. Actual first flight was in 2024.
Although the official record for fastest piston-engined aeroplane in level flight was held by a Grumman F8F Bearcat, the Rare Bear, with a speed of 850.23 km/h (528.31 mph), the unofficial record for fastest piston-engined aeroplane in level flight is held by a British Hawker Sea Fury at 880 km/h (547 mph).
Once in commercial service, it could be the fastest high-speed train in the world, surpassing China’s current CR400 model, which debuted in 2017 and operates at 350 kilometers (217 miles) per hour.
While it may have been designed as the fastest propeller-driven aircraft, this goal was never realized due to severe stability problems. [7] This record speed is also inconsistent with data from the National Museum of the United States Air Force, which gives a top speed of "only" 840 km/h (520 mph; 450 kn) or Mach 0.70. [8] McDonnell XF-88B
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