Bell V-280 Valor

The Bell V-280 Valor is a third-generation tilt-rotor concept being developed by Bell Helicopter and Lockheed Martin^[1] for the United States Army's Future Vertical Lift (FVL) program. The aircraft was officially unveiled at the 2013 Army Aviation Association of America's (AAAA) Annual Professional Forum and Exposition in Fort Worth, Texas, with a projected first flight in 2017.

Development

On 5 June 2013, Bell announced that the V-280 Valor design had been selected by the US Army for the Joint Multi-Role (JMR) Technology Demonstrator (TD) phase. The JMR-TD phase is the technology demonstration precursor to Future Vertical Lift (FVL). The army classified the offering as a Category I proposal, meaning it is a well-conceived, scientifically or technically sound proposal pertinent to program goals and objectives with applicability to army mission needs, offered by a responsible contractor with the competent scientific and technical staff supporting resources required to achieve results.^[2] JMR-TD contracts were expected to be awarded in September 2013, with flights scheduled for 2017.^[3] On 9 September 2013, Bell announced it would team up with Lockheed Martin to develop the V-280. Lockheed will provide integrated avionics, sensors, and weapons to the aircraft. Additional partners were announced in the following months,^[1] including Moog Inc. for the flight control systems,^[4] GE Aviation for the engines,^[5] GKN for the tail structure,^[6] Spirit AeroSystems for the composite fuselage,^[7] Eaton Corporation as the distributor of hydraulics and power generation systems,^[8] and Astronics Advanced Electric Systems to design and manufacture power distribution systems.^[9] Israel Aerospace Industries, the first international partner recruited for the V-280, will supply the nacelle structures, and Textron sister company TRU Simulation & Training will build a high-fidelity marketing simulator and desktop maintenance trainer.^[10]

On 2 October 2013, the U.S. Army awarded a technology investment agreement to Bell Helicopters for the V-280 Valor tiltrotor under the Joint Multi-Role program.^[11] Awards were also given to AVX Aircraft, Karem Aircraft, and a Sikorsky-Boeing team. JMR is not to develop a prototype for the next family of vehicles, but to develop technologies and interfaces. The TIAs give the four teams nine months to complete preliminary design of their rotorcraft, which the Army will then review and authorize the construction of two competing demonstrators to fly in 2017. While there is a potential for an early downselect, the four teams are focused on the 2017 flight demonstrations.^[12][13] Each of the four teams received $6.5 million from the Army for phase I of the program, although Bell is investing an undisclosed amount of its own money.^[14] On 21 October 2013, Bell unveiled the first full-scale mock-up of the V-280 Valor at Association of the United States Army 2013.^[15]

On 11 August 2014, the Army informed the Bell-Lockheed team that they had chosen the V-280 Valor to continue with the JMR demonstration program. The Boeing-Sikorsky team offering the SB-1 Defiant was also chosen.^[16] Announcement of the selections was officially made on 3 October 2014, and the teams will begin building technology demonstration aircraft for test flights beginning in 2017.^[17] Bell unveiled a full-scale mock-up of the V-280 Valor on the floor at AUSA 2014 to showcase the configuration and design of the high-speed platform. It is focused on the infantry squad and is to handle much like a helicopter in terms of low-speed agility to have unprecedented pitch, roll, and yaw response for those operations. Roughly the size of the current medium-lift helicopter, the V-280 is designed to travel twice as fast and twice as far. Bell is pitching these capabilities for movement over vast areas like the Pacific; the program director said the need for forward arming and refueling points could be eliminated and that one FOB (forward operating base) in the middle of a country, such as Afghanistan, could cover the entire country.^[18]

Design

The V-280 is reported to be designed for a cruising speed of 280 knots (320 mph; 520 km/h), a top speed of 300 knots (350 mph; 560 km/h), a range of 2,100 nautical miles (2,400 mi; 3,900 km), and an effective combat range of 500 to 800 nmi (580 to 920 mi; 930 to 1,480 km). Expected maximum takeoff weight is around 30,000 lb.^[19] In one major difference from the earlier V-22 Osprey tiltrotor, the engines remain in place while the rotors and drive shafts tilt. A driveshaft runs through the straight wing, allowing both prop rotors to be driven by a single engine in the event of engine loss. The V-280 will have retractable landing gear, a triple-redundant fly by wire control system, and a V-tail configuration. The wings are made of a single section of carbon fiber composite, reducing weight and production costs. The V-280 will have a crew of 4 and be capable of transporting up to 14 troops. Dual cargo hooks will give it a lift capacity to carry a 10,000 lb (4,500 kg) M777A2 Howitzer while flying at a speed of 150 knots (170 mph; 280 km/h). The fuselage is visually similar to that of the UH-60 Black Hawk medium lift helicopter. When landed, the wing is in excess of seven feet from the ground, allowing soldiers to egress easily out of two 6-foot (1.8 m) wide side doors and door gunners to have wide fields of fire. Although the initial design is a utility configuration, Bell is also working on an attack configuration.^[20][21][22]

GE Aviation will manufacture the engines for the V-280, with the prototype (air vehicle concept demonstrator, or AVCD) using the General Electric T64.^[23] The specific engine for the model performance specification (MPS) is unknown, but has funding from the Army's future affordable turbine engine (FATE) program.^[5] The V-tail structure and ruddervators, made by GKN, will provide high levels of maneuverability and control to the airframe. It will be made of a combination of metals and composites.^[6] Features in the interior include seats that wirelessly charge troops’ radios, night-vision goggles, and other electronic gear and windows that display three-dimensional mission maps.^[24]

Special emphasis has been placed on reducing the weight of the V-280 in comparison to the V-22, which in turn would reduce cost. To do this, composites are used extensively in the wing, fuselage, and tail. Wing skins and ribs are made of a honeycomb-stiffened "sandwich" construction with large-cell carbon cores for fewer, larger, and lighter parts. Skins and ribs are paste-bonded together to eliminate fasteners. With these measures, costs are reduced by over 30 percent compared to a scaled V-22 wing.^[25] While the Osprey has a higher disk loading and lower hover efficiency than a helicopter, the V-280 will have a lower disk loading and longer wing for greater hover and cruise efficiency.^[10]

References

External links

External images

Full-size mock-up

• http://bellv280.com/ and http://bellv280.com/wp-content/uploads/FVL-Fact-Sheet-AAAA-2013-web.pdf
• http://www.bellhelicopter.com/cf/ceoBlog.cfm
• http://www.youtube.com/watch?feature=player_embedded&v=1O3Onyas984