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2. McDonnell XV-1 - Wikipedia

   en.wikipedia.org/wiki/McDonnell_XV-1

   The XV-1 began tethered hovering flight tests on 11 February 1954, with test pilot John R. Noll. The tether had lead weights intended to keep the aircraft in ground effect until issues with the rotor's tip-jet propulsion system were solved. On 14 July 1954, the lead weights were removed and the XV-1 conducted its first free hovering flight. [1]

3. Bell XV-15 - Wikipedia

   en.wikipedia.org/wiki/Bell_XV-15

   The first XV-15 prototype aircraft, N702NA, was transferred back to Bell for company development and demonstration use. On 20 August 1992, the aircraft crashed while being flown by a guest test pilot. He was lifting off for a final hover when a bolt slipped out of the collective control system on one pylon, causing that rotor to go to full pitch.

4. Bell XV-3 - Wikipedia

   en.wikipedia.org/wiki/Bell_XV-3

   XV-3 in forward flight Bell XV-3 in a hover, 1955. This was first version with 3-blade rotors and crashed. XV-3 test, in vertical flight with 2 blade rotors. In 1951, the Army and Air Force announced the Convertible Aircraft Program and released the Request for Proposals (RFP) to solicit designs from the aircraft industry.

5. BERP rotor - Wikipedia

   en.wikipedia.org/wiki/BERP_rotor

   Even when hovering, the rotor tips may be travelling at a significant fraction of the speed of sound. As the helicopter accelerates, its overall speed is added to that of the tips, meaning that the blades on the forward-moving side of the rotor sees significantly higher airspeed than the rearward-moving side, causing a dissymmetry of lift.

6. Helicopter flight controls - Wikipedia

   en.wikipedia.org/wiki/Helicopter_flight_controls

   Helicopter rotors are designed to operate at a specific rotational speed. The throttle controls the power of the engine, which is connected to the rotor by a transmission. The throttle setting must maintain enough engine power to keep the rotor speed within the limits where the rotor produces enough lift for flight.

7. Tethered flight test - Wikipedia

   en.wikipedia.org/wiki/Tethered_flight_test

   Tethered rocket test Tethered VTOL test. A tethered flight test is a type of flight testing where a machine is connected by a tether to the ground. Tethered testing may be used when motion through the atmosphere is not required to sustain flight, such as for airship; [1] vertical take-off and landing (VTOL), rotary wing or tiltwing aircraft (tethered hovering); [2] or for tests of certain ...

8. Startling video shows moment man survives helicopter crash ...

   www.aol.com/shocking-moment-man-survives...

   The Robinson R44 aircraft spun out of control on its approach to the helicopter garage at Pearland Regional Airport around 9:30 Sunday morning, the dizzying CCTV footage of the incident showed.

9. Sikorsky R-4 - Wikipedia

   en.wikipedia.org/wiki/Sikorsky_R-4

   The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, [1] the United States Navy, the United States Coast Guard and the United Kingdom's Royal Air Force and Royal Navy. In U.S. Navy and U.S. Coast Guard service, the helicopter was known as the Sikorsky HNS-1.