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Bell V-280 Valor

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V-280 Valor
Bell V-280 in high-speed cruise configuration
Role Vertical lift aircraft
National origin United States
Manufacturer Bell / Lockheed Martin
First flight 18 December 2017[1]
Status Under development; flight testing

The Bell V-280 Valor is a tiltrotor aircraft being developed by Bell and Lockheed Martin for the United States Army's Future Vertical Lift (FVL) program.[2] The aircraft was officially unveiled at the 2013 Army Aviation Association of America's (AAAA) Annual Professional Forum and Exposition in Fort Worth, Texas. The V-280 made its first flight on 18 December 2017 in Amarillo, Texas.[3]

Development

On 5 June 2013, Bell Helicopter 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.[4] JMR-TD contracts were expected to be awarded in September 2013, with flights scheduled for 2017.[5]

On 9 September 2013, Bell announced it would partner 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,[2] including Moog Inc. for the flight control systems,[6] GE Aviation for the engines,[7] GKN for the tail structure,[8] Spirit AeroSystems for the composite fuselage,[9] Eaton Corporation as the distributor of hydraulics and power generation systems,[10] and Astronics Advanced Electric Systems to design and manufacture power distribution systems.[11] 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.[12]

On 2 October 2013, the U.S. Army awarded a technology investment agreement to Bell for the V-280 Valor tiltrotor under the Joint Multi-Role program.[13] Awards were also given to AVX Aircraft, Karem Aircraft, and a Sikorsky-Boeing team. The JMR program is not intended 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.[14][15] 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.[16] 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.[17]

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.[18] 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.[19] 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.[20]

Although Bell sold its share in the AW609 program in 2011, Bell continues to work on the AW609 and considers commercial potential for the V-280, as a military mass production of 2–4,000 aircraft could reduce unit cost to commercially acceptable levels.[21][22] However, in 2016, Bell stated that it preferred the 609 for commercial use, and intended to offer the V-280 for military use only. Bell also stated that conventional helicopters were not part of Bell's military future.[23]

V-280 Valor prototype in flight at the 2019 Alliance Air Show, Fort Worth, TX

Prototype

In June 2015, Bell's subcontractor Spirit AeroSystems began assembly of the composite fuselage for the first prototype V-280 Valor,[24] which was delivered in September 2015.[25] In total, the design and manufacturing of the fuselage was completed in only 22 months.[26] Although the V-280 is initially planned for the JMR demonstration program, Bell does not anticipate much difference between it and a final FVL entry.[27] By January 2016, the V-280 demonstrator was 23 percent complete,[28] with the fuselage and wings mated together in early May 2016.[29] The demonstrator aircraft began ground vibration testing in Amarillo during February 2017, with the aircraft reaching 95 percent complete.[30]

The demonstrator was undergoing ground testing in October 2017.[31][32] Bell released a video on 18 December showing the first flight with the area around the pivots blurred.[33] In April 2018, it has run for 75 hours on the ground and flown for 19 hours, up to 80 knots (90 mph; 150 km/h), before transitioning to airplane flight by the end of the month.[34] By the end of the month, it attained 140 kn (160 mph; 260 km/h) with proprotors 60-deg. forward, and is planned to reach its airplane cruise configuration with horizontal pylons in summer.[35] It reached 190 kn (220 mph; 350 km/h) in cruise mode with horizontal propellers on 11 May.[36]

After 155 hours of rotor turn time and 70 flight hours, by October 2018 it had reached 250 kn (290 mph; 460 km/h) at 80% proprotor cruise speed. It was also flown to a 45° bank angle at up to 200 kn (230 mph; 370 km/h), achieved a 4,500 ft/min (23 m/s) climb rate at 160 kn (180 mph; 300 km/h), exceeded 200 kn (230 mph; 370 km/h) with less than 50% torque, and recorded a peak load factor of 1.9 g. Its longest flight covered 270 mi (230 nmi; 430 km) in 2.1 hours and it was moved to Arlington, Texas to continue testing closer to the US Army.[37]

After one year of flight tests, it reached its 280-knot (320 mph; 520 km/h) target by January 2019, as it will continue to expand its flight envelope: low-speed agility, bank angles, and autonomous operations.[38] In March, the V-280 reached 300 kn (345 mph; 556 km/h) as it was flown for over 100 hours, before low-speed manoeuvrability tests.[39] [40]

Design

V-280 in flight with rotors tilted to hover configuration.

The V-280 is reported to be designed for a cruising speed of 280 knots (320 mph; 520 km/h) (hence the name V-280),[41] 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 pounds (14,000 kg).[42] 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 reinforced polymer composite, reducing weight and production costs. The V-280 will have a crew of four 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 7 ft (2.1 m) 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.[43][44][45]

Whether different variants of the V-280 would fill utility and attack roles or a single airframe could interchange payloads for either mission, Bell is confident the Valor tiltrotor platform can fulfill both duties; the U.S. Marine Corps is interested in having one aircraft to replace utility and attack helicopters, but the Army, which leads the program, is not committed to the idea and wants distinct platforms for each mission. Bell and Lockheed claim an AV-280 variant can launch rockets, missiles, and even small unmanned aerial vehicles forward or aft with no rotor interference, even in forward flight and cruise modes with the rotors forward.[27]

GE Aviation will manufacture the engines for the V-280, with the prototype (air vehicle concept demonstrator, or AVCD) using the General Electric T64.[46] The specific engine for the model performance specification (MPS) is unknown, but has funding from the Army's future affordable turbine engine (FATE) program.[7] 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.[8] 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.[47]

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.[48] Bell expects the V-280 to cost around the same as an AH-64E or MH-60M.[49] 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.[12] As the AW609 has already performed autorotation, it is expected that the V-280 (with similar disc loading) will demonstrate the same capability.

Specifications

Data from bellflight.com,[50] militaryfactory.com[51]

General characteristics

  • Crew: 4
  • Capacity: 14 troops
  • Length: 50.5 ft (15.4 m)
  • Width: 81.79 ft (24.93 m)
  • Height: 23 ft 0 in (7 m)
  • Empty weight: 33,069 lb (15,000 kg)
  • Max takeoff weight: 57,320 lb (26,000 kg)
  • Powerplant: 2 × General Electric T64 turboshaft
  • Propellers: 35 ft 0 in (10.7 m) diameter

Performance

  • Cruise speed: 320 mph (520 km/h, 280 kn)
  • Combat range: 580–920 mi (930–1,480 km, 500–800 nmi)
  • Ferry range: 2,400 mi (3,900 km, 2,100 nmi)
  • Service ceiling: 6,000 ft (1,800 m) ; in hover out of ground effect at 95 °F (35 °C)
  • Disk loading: 16[52] lb/sq ft (78 kg/m2)

See also

Related development

Aircraft of comparable role, configuration, and era

References

  1. ^ Judson, Jen (20 December 2017). "V-280 Valor flies for the first time". Defense News.
  2. ^ a b "Bell Helicopter and Lockheed Martin team on V-280 Valor", AirFramer, September 9, 2013. Accessed: September 9, 2013.
  3. ^ "Bell Helicopter Achieves First Flight of V-280 Valor". Heliweb Magazine. 2017-12-18. Retrieved 2017-12-18.
  4. ^ Drwiega, Andrew. "The Generation Game" Air International January 2014, p. 106. Accessed: 17 June 2014.
  5. ^ Bell V-280 Valor Selected for Army’s JMR-TD Program Archived 2013-07-18 at the Wayback Machine - Bell press release, 5 June 2013
  6. ^ "Moog to design, manufacture flight control system for Bell V-280 Valor" AirFramer. Accessed: 11 October 2013.
  7. ^ a b Bell switches engine supplier for next tiltrotor, chooses GE - Flightglobal.com, 16 October 2013
  8. ^ a b GKN Aerospace to develop V-Tail for Bell V-280 Valor Archived 2013-10-18 at the Wayback Machine - GKN news release, 17 October 2013
  9. ^ Spirit AeroSystems to build V-280 fuselage - Flightglobal.com, 21 October 2013
  10. ^ Courtney Howard. "Bell Helicopter chooses Eaton hydraulics and power generation system for Bell V-280 Valor". avionics-intelligence.com.
  11. ^ Bell Helicopter, Astronics Announce Cooperative Agreement - Asdnews.com, 5 May 2014
  12. ^ a b Bell Adds To V-280 Tiltrotor Team For Army JMR Demo - Aviationweek.com, 14 October 2014
  13. ^ "Army awards JMR-TD program technology investment agreement with Bell Helicopter for next-generation tiltrotor demonstrator" AirFramer 8 October 2013. Accessed: 11 October 2013.
  14. ^ Karem Unveils Variable-Speed Tiltrotor For U.S. Army JMR Demo - Aviationweek.com, 2 October 2013
  15. ^ Army selects four companies for advanced rotorcraft concepts - Flightglobal.com, 3 October 2013
  16. ^ Doubts Swirl around Army’s Next Generation Helicopter Fleet - Defensetech.org, 25 October 2013
  17. ^ Bell unveils V-280 Valor mock-up - Flightglobal.com, 21 October 2013
  18. ^ Army Picks Firms to Build Future Helicopter - DoDBuzz.com, 12 August 2014
  19. ^ U.S. Army Selects Bell and Sikorsky/Boeing to Build Prototypes for Next Generation Helicopter Program - News.USNI.org, 3 October 2014
  20. ^ Bell Touts New Tilt-Rotor High-Speed Helicopter - Defensetech.org, 14 October 2014
  21. ^ Black, Thomas. "Bell Helicopter exploring civilian market for new tilt-rotor aircraft" Archive1 Archive2
  22. ^ Rohit Jaggi. "Helicopter market eyes civilian tilt-rotor models". Financial Times. Archived from the original on October 24, 2014. We're talking 2–4,000 aircraft
  23. ^ HELI-EXPO: Bell rules out future conventional military helicopter developments
  24. ^ V-280 Valor: Bell Starts Building Joint Multi-Role Prototype - Breakingdefense.com, 19 June 2015
  25. ^ "Spirit delivers first V-280 tiltrotor aircraft fuselage to Bell (+ video)". kansas. Archived from the original on 2015-09-23.
  26. ^ Spirit AeroSystems used HyperSizer software for V-280 Valor program - CompositesWorld.com, 21 December 2015
  27. ^ a b Bell sees V-280 Valor as common attack-utility platform - Flightglobal.com, 2 July 2015
  28. ^ Bell preparing to affix V-280 wing as ‘Valor’ takes shape - Flightglobal.com, 20 January 2016
  29. ^ Bell Helicopter mates fuselage and wings of first V-280 - Flightglobal.com, 4 May 2016
  30. ^ V-280 Valor begins ground vibration testing - Verticalmag.com, 16 February 2017
  31. ^ Prototype Bell V-280 VALOR up on the test pedestal at Bell Helicopter Plant in Amarillo, TX - Flightaware.com
  32. ^ James Drew (Oct 3, 2017). "Bell V-280 Ready For First Flight". Aviation Week & Space Technology.
  33. ^ Bell V-280 Valor achieves first flight - Vertical Magazine
  34. ^ Jen DiMascio (Apr 9, 2018). "Bell's V-280 To Fly Like Aircraft". Aviation Week Network.
  35. ^ James Drew (Apr 26, 2018). "Bell V-280 Passes 140 Kt. On Way To 'Cruise Mode'". Aviation Week Network.
  36. ^ Garrett Reim. "Bell Helicopter V-280 tilts rotors to cruise mode 16 MAY, 2018". Flightglobal.
  37. ^ Graham Warwick (Oct 29, 2018). "The Week In Technology, Oct. 29-Nov. 2, 2018". Aviation Week & Space Technology.
  38. ^ Dominic Perry (25 Jan 2019). "Bell V-280 hits 280kt speed goal". Flightglobal.
  39. ^ Garrett Reim (16 April 2019). "Bell V-280 Valor tiltrotor reaches 300kt". Flightglobal.
  40. ^ "Bell V-280 Tilt Rotor Aircraft Flies Demonstration". The Dallas Morning News. Retrieved 2020-01-29.
  41. ^ YouTube
  42. ^ Huber, Mark. "Bell Applying 525 Technology to V-280" AIonline, 3 August 2014. Accessed: 4 August 2014. Archived on 4 August 2014.
  43. ^ "PICTURES: Bell unveils V-280 Valor". Flightglobal.com.
  44. ^ "Bell unveils V-280 Valor tiltrotor concept for U.S. Army program". Aerospace Blog.
  45. ^ Bell V-280 Valor Spotlighted at SOFIC - Defensemedianetwork.com, 23 May 2013.
  46. ^ Warwick, Graham. "Speed vs. cost" Aviation Week & Space Technology p. 31, 25 August 2014. Accessed: 26 August 2014.
  47. ^ Army May Pick Future Helo Designs This Summer - Defensetech.org, 5 May 2014
  48. ^ Affordability Challenge In Pursuit Of Army JMR/FVL - Aviationweek.com, 25 August 2014
  49. ^ V-280 fuselage delivery highlights focus on cost
  50. ^ "Specification: Bell V280". bellflight.com. Retrieved 2018-04-18.
  51. ^ "Bell V-280 Valor 3rd Generation Tiltrotor Technology Demonstrator - United States". militaryfactory.com. Retrieved 2019-01-23.
  52. ^ [1]
Wikimedia Commons has media related to Bell V-280.
External images
image icon Bell V-280 image gallery
image icon Mock-up photos by American Helicopter Society
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