Bell V-280 Valor Tilt Rotor First Flight
Unlike the earlier Bell-Boeing V-22 Osprey the V-280, targeted to cruise at 280 kts, does not tilt its engines (two GE T64s) only its rotors. This eliminates engine lubrication complexity and reduces the hot efflux effects on the ground. To achieve this engine power is transmitted through a spiral bevel gearbox that transfers power to the proprotor gearbox. This rotates on two spherical bearings. Bell are clearly sensitive about the design solution as both video and photographs have been altered to blur the mechanism and preserve the Valor’s modesty.
In the event of an engine failure, power is transmitted by a cross-shaft, similar to that on the V-22, from the operative engine to the opposite proprotor.
The V-280 had previously conducted ground runs on a test stand at Amarillo, TX:
It features a triple-redundant fly by wire (FBW) control system.
UPDATE 26 February 2018: The V-280 has now flown for 9 hours and been rotors running for 56 hours. The first US Army pilot flew it 7 February 2018.
UPDATE 15 May 2018: V-280 has now completed a transition to forward flight and achieved 190 kts.
UPDATE 20 June 2018: Bell’s V-280 Valor shows off agility, speed in first public flight demo
UPDATE 18 December 2018: V-280 Reducing Risk For Future Army Tiltrotor, Bell Says
UPDATE 9 January 2019: Flying the Bell V-280 Valor: Tru Simulation Technical Demonstrator
UPDATE 29 January 2019: Bell to roll back V-280 funding until US Army competition
Bell plans to make no more significant investments in its V-280 Valor tiltrotor until the US Army makes a commitment to Future Vertical Lift Capability Set 1 or Capability Set 3 programmes.
After the V-280 reached its 280kt (519km/h) speed goal on 23 January, Bell believes that it sufficiently demonstrated the tiltrotor technology.
UPDATE 21 May 2019: V-280 Passes Key Agility Test
JMR-TD and FVL
The Bell V-280 Valor program is part of the Joint Multi Role Technology Demonstrator (JMR-TD) initiative, started in 2013, which runs into 2019. Construction of the V-280 began in June 2015.
The JMR-TD program is the R&D precursor to the Department of Defense’s Future Vertical Lift (FVL) programme that will be the basis for the replacement of the majority of US military rotorcraft and undoubtedly reshape the US rotorcraft industry.
The V-280 program brings together Bell Helicopter, Lockheed Martin, GE, Moog, IAI, TRU Simulation & Training, Astronics, Eaton, GKN Aerospace, Lord, Meggitt and Spirit AeroSystems (who make the fuselage) – collectively referred to as Team Valor.
Team Valor’s main rival for FVL is a team of Sikorsky (now part of Bell’s team-mate Lockheed Martin!) and former Bell V-22 partner Boeing, who joined forces to develop the SB>1 Defiant. This combines a coaxial rotor with a pusher propeller.
UPDATE 26 December 2018: The 30,000lb (13.6t) prototype SB>1 has been rolled out and is due to fly early in 2019.
UPDATE 21 March 2019: The SB>1 flies.