sikorsky counter rotating helicopter

Transmission for a coaxial counter rotating rotor system Abstract A transmission system for a hybrid aircraft is driven by a plurality of driveshafts and drives a translational propulsion. It had the disadvantage of a tall rotor system which was incompatible with the Armys requirement that the UTTAS be air transportable in the C-130/141. Sikorsky Global Helicopters was created in early 2009 as a business unit of the company to focus on commercial aircraft. On June 6,2005, Sikorsky announced that it would build and test a technology demonstratorthat would maneuver like a conventional helicopter and cruise at 250 knots (288mph), which is at least 60 percent faster than conventional helicopters. Sign up to receive Popular Science's emails and get the highlights. At high speeds, Gehler claimed, tiltrotors are far and away more maneuverable than compound helicopters: Right now, compound coax is having challenges turning at high speed., Thats true of less sophisticated compound helicopter designs, said Van Buiten, but not of theirs, in large part because of the two counter-rotating rotors. About the develemental phase when you already have a proven concept, insane. The two main rotors of the S-97 are coaxial, and they rotate in opposite directions, driving both lift and forward flight. Sikorsky Aircraft's coaxial X2 Technology demonstrator has achieved the 250-knot (287.69 mph) milestone that was established as the goal of the craft from its inception. With the counter-rotating rotors, no tail rotor was required to react rotor torque. The Advancing Blade Concept exhibited excellent potential for application to tactical Army aircraft. To reduce cost the drive system for the rotor and the auxiliary propulsion were not integrated. Unlike most helicopters, Sikorsky's bid uses two counter-rotating coaxial main rotors and a pusher propeller that the company says will allow for quicker acceleration and deceleration. When vertical, they act like giant propellers, allowing fast and fuel-efficient flight with no risk of retreating blade stall (because of the angle at which they meet the air). Sikorsky says that the S-97 Raider has a cruising speed of 253 mph (407 km/h, 220 kn), which is more than double the speed of conventional helicopters, and pulls three G's in the turns for. Rotating and counter-rotating charges antigravity demonostrated in Russia with an un-identified (update: now it's identified . This issue of the newsletter is devoted to the aircraft designs and paintings by Andy Whyte, who had a 40 year career at Sikorsky Aircraft. This proved the basic advancing blade concept and led to a contract in 1972 with the U.S. Army for the design, fabrication, and flight testing of the XH-59A advancing blade concept demonstrator aircraft. "Experimentalaircraft have minds of their own ? While the Armys currently leading the most near-term parts of Future Vertical Lift, the overwhelming bulk of Army rotorcraft requirements involve transport, where FVLs virtues dont matter much. Elevators were included in the tail. The subject of this newsletter is in response to an archive members question, How Are Sikorsky Helicopters Named?. Heres how it works. Where a standard helicopter uses a side-facing tail rotor to offset the torque of the main rotor in front, the pusher propeller of the S-97 will assist in high-speed acceleration and deceleration. Bell Boeing V-22 Osprey. Five years in the US Army as a translator (German and Polish). The US Army has not yet made any formal announcement about a long-term replacement for the Kiowa. Sikorsky Aircraft Corporation 6900 Main StreetP.O. With this rotor configuration, the rotors capability to generate lift would not drop off with speed, or with altitude. It was proposed by the Serbian man Dragoljub . The aircraft was designed to fly with or without the auxiliary propulsion J-60s installed. Kamov has been making dual contrarotating rotor helicopters since the 1940-s. Meanwhile, over at Bell, their FARA candidateboth companies refer to the aircraft they are working on as a competitive prototypeis the 360 Invictus, which in March was reported to be 87-percent finished. In September 2010, Sikorsky's similarly designed X2 technology demonstrator reached a speed of 250 knots (287 mph), a feat that the longtime rotorcraft maker at the time said "unofficially shattered the helicopter world speed record." Also at that time higher harmonic control was receiving a lot of attention throughout the industry, and the thought was that the ABC might benefit from that technology. Contour flight handling qualities revealed the XH-59A is capable of crossing terrain in high speed (215 knots) contour flight, thus reducing the reaction time available to the enemy targets and defenses. Its the Army that Bell and Sikorsky must convince. Click The XH-59B program was not funded. This became the XH-59A, the subject of another chapter in this Sikorsky Product History section. S-70A-1 Desert Hawk; variant for Saudi Arabian military S-70A-1L Saudi Desert Hawk Medevac variant S-70A-5 Variant for Philippine Air Force S-70A-9 Continued operation in RF environments whether thats GPS denial or communications disruption is arguably the number-one requirement for overmatch against near peers. In 1967 Sikorsky investigated new light-weight dual-hardness aircraft armor. Privacy Center SpaceX Crew-6 astronaut launch: Live updates, Heli-Skiing: Winter Thrills in Remote Areas, Marvel's 'Star Wars' comics celebrate Women's History Month with Peach Momoko covers. An H tail, with rudders, was used to get the vertical tails outboard in clean air for better effectively. To date, the Sikorsky X2 has been developed into two main helicopters: Boeing-Sikorsky SB-1 Defiant and Sikorsky S-97 Raider. Unlike most helicopters, Sikorskys bid uses two counter-rotating coaxial main rotors and a pusher propeller that the company says will allow for quicker acceleration and deceleration. Primarily among these was the use of separate engines for rotor power and auxiliary propulsion. The hubs spin in opposite directions, whicheliminates the torque effect. Terms of Use / Privacy Policy / Manage Newsletters, - The ABC had the additional advantages of not requiring a tail rotor, and a design where the control swashplates for the two rotors were buried below the rotors, both further reducing the vulnerable area of the aircraft against ballistic threats. The 6.5 ft. ducted propeller would be mounted under the rotor system to minimize aircraft size. The speed, which was achieved in level flight during a 1.1-hour flight on Wednesday, September 15, is an unofficial speed record for a helicopter, easily beating the current . With faster speeds, you get less lift capacity unless you want to pay more. ?Weinitiated X2 Technology convinced that the most productive and flexiblehelicopter is a helicopter which is capable of a significant increase in speed,?said Stephen Finger, then-president of Sikorsky Aircraft. Missions Armed reconnaissance Length 37ft Width 16ft Rotor Diameter 34ft Speed 220k Expand Composite materials technology would soon appear which could produce a better blade, with almost infinite options in geometry, at a substantially reduced cost and lighter weight. This human and technical feat has given rise to a family of aircraft that have been entered into the history of aviation. The CH-53K continues to successfully execute key performance, test, and production milestones. Counter-rotating: Hub Type: Main Rotor . One month later the first XH-59A aircraft experienced a low speed accident on the flight field. It doesnt get rid of excessive vibration at high speed, but exceptionally rigid rotor materials and advanced vibration controls do, Sikorsky says. First, like some conventional helicopters, especially Russian designs, a compound helicopter has two coaxial rotors on top that rotate in opposite directions (counter-rotation). While its unclear when the Army will make a decision as to which aircraft it wants to go with for the FARA program, the FLRAA competition is further along. Igor Sikorsky seems to be the first to settle on using a single rotor mounted at the rear of the helicopter as a way to counter the torque. Join PopSci+ to read sciences greatest stories. We have flown more than 1,200 test flight hours and the CH-53K has achieved key milestones in 2018 such as high altitude, hot temperature,and degraded visual environment flights and we will continue to accomplish test points demonstrating this aircrafts unmatched capabilities. Designs were prepared for the rotor, drive system, and controls, and preliminary designs of mission aircraft were studied. Independent control for upper and lower rotor of a rotary wing aircraft Patent number: 11440650 Abstract: An aircraft is provide including an airframe, an extending tail, and a counter rotating, coaxial main rotor assembly including an upper rotor assembly and a lower rotor assembly. The advancing blades are effectively going faster, relative to the air, because they add the helicopters forward movement to their own, so they generate more lift. I am not sure that we are cheaper than [General Atomics] but we are more flexible in the different payloads we can operate, Ron Tryfus, IAI senior vice-president for future growth, said. : The Future Vertical Lift program aims to create revolutionary replacements for todays military helicopters. The Sikorsky X2 is an experimental high-speed compound helicopter with coaxial rotors, developed by Sikorsky Aircraft, that made its first flight in 2008 and was officially retired in 2011. The test envelope was expanded to level flight at 156 knots, dive speeds to 186 knots, and altitudes to 14,000 feet. During this period the Navy, Air Force, and NASA joined the Army in providing funding support. [Related: Tilting rotors could help make Bells speedy new aircraft the next Black Hawk], It looks similar to Defiant, says Germanowski, referring to the Raider X. That's in an assault configuration; there will also be an attack variant that shares a common fly-by-wire drivetrain and many other systems, but has a different composite fuselage and is much more heavily armed. From July 1975 to March 1977 the helicopter configuration was tested. Joining the team as a motorcycle specialist, he's covered just about everything for New Atlas, concentrating lately on eVTOLs, hydrogen, energy, aviation, audiovisual, weird stuff and things that go fast. It also required titanium rather than aluminum to get the strength and modulus necessary for a practical blade design. 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