Bell 525 Relentless

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Bell 525 Relentless
Role Medium-lift utility helicopter
National origin United States
Manufacturer Bell Helicopter
Status Under development

The Bell 525 Relentless is a proposed American medium-lift helicopter, currently under development by Bell Helicopter. The Bell 525 was unveiled at the 2012 Heli Expo in Dallas, Texas on February 12, 2012. Bell expects the 525 to take its first flight in late 2014, with certification expected in 2015.

Design and development[edit]

The Bell 525 is being developed to meet a requirement for a medium lift helicopter. It will be constructed primarily from composites and metal and is to be the first commercial helicopter to incorporate fly-by-wire flight controls,[1] with tactile cues. The system is triple redundant, and is developed in two simulator environments.[2] The 525 will be powered by a pair of GE CT7-2F1 turboshaft engines, with a new composite five-blade main rotor system.[3] The cost of the 525 has not yet been determined, but it is expected to be cost competitive on missions between 50 and 400 nmi, performed by helicopters such as the AgustaWestland AW139 and Sikorsky S-92.[4][5]

The Bell 525 is designed to fit the emerging "Super-Medium" size category suited ideally to Offshore Oil and Gas support operations,[6][specify] with 50% of the customers coming from that sector.[2] Helicopters in development that are similar include the Eurocopter EC175 and the AgustaWestland AW189.[3] The Bell 525's maiden flight is planned for late 2014,[7] with certification to follow in 2015.[3] PHI, Inc. is the launch customer for the type.[3]

Specifications (Bell 525)[edit]

Data from Bell Helicopter[8]

General characteristics

  • Crew: 1 or 2
  • Capacity: 16 or 20 passengers
    7,400 pounds (3,400 kg) useful load
  • Gross weight: 19,300 lb (8,754 kg)
  • Fuel capacity: 2,400 liters (530 imp gal; 630 US gal)
  • Powerplant: 2 × General Electric CT7-2F1 turboshaft, 1,800 shp (1,300 kW) each
  • Main rotor diameter: 54 ft 6 in (16.61 m)

Performance

  • Cruising speed: 178 mph; 287 km/h (155 kn)
  • Range: 575 mi; 926 km (500 nmi) with a 1,530 pounds (690 kg) payload
  • Service ceiling: 20,000 ft (6,096 m)

Avionics

See also[edit]

Aircraft of comparable role, configuration and era

References[edit]

  1. ^ "Bell's 525 is Relentless". Sport Aviation: 14. April 2012. 
  2. ^ a b Maher, Guy. "'Flight Testing' the Bell 525 Relentless" Vertical, 10 July 2014. Accessed: 23 July 2014. Archived on 23 July 2014.
  3. ^ a b c d Norris, Guy (February 20, 2012). "Bigger Bell (web title: Bell Rings In Changes With Super-Medium 525 Relentless)". Aviation Week & Space Technology (New York: McGraw-Hill) 174 (7): 36–37. 
  4. ^ "Bell 525 Brochure". Bell Helicopter, February 2012.
  5. ^ "‘Relentless’ 525 To Be Largest Bell Helicopter". AINOnline, February 2012.
  6. ^ http://www.ascendworldwide.com
  7. ^ "Bell Helicopter Reveals the Latest in the Bell 525 Program during HELI-EXPO 2014". Bell Helicopter, February 25, 2014.
  8. ^ [1]

External links[edit]