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Bell 525 Relentless : ウィキペディア英語版
Bell 525 Relentless

The Bell 525 Relentless is an American medium-lift helicopter, under development by Bell Helicopter. The Bell 525 was unveiled at the 2012 Heli-Expo in Dallas, Texas in February 2012. The helicopter first flew on July 1, 2015.
==Design and development==
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, with tactile cues. The system is triple redundant, and is developed in two simulator environments.〔 The 525 will be powered by a pair of GE CT7-2F1 turboshaft engines, with a new composite five-blade main rotor system.〔 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.〔("Bell 525 Brochure" ). ''Bell Helicopter'', February 2012. pdf〕〔("‘Relentless’ 525 To Be Largest Bell Helicopter" ). ''AINOnline'', February 2012. 〕
The Bell 525 is designed to fit the emerging "Super-Medium" size category suited ideally to support offshore oil and gas operations,〔http://www.flightglobal.com/news/articles/analysis-oil-prices-create-super-uncertainty-409077/〕 with 50% of the customers coming from that sector.〔Maher, Guy. "('Flight Testing' the Bell 525 Relentless )" ''Vertical'', 10 July 2014. Accessed: 23 July 2014. (Archived ) on 23 July 2014.〕 Helicopters under development in the same class are the Eurocopter EC175 and the AgustaWestland AW189.〔 The Bell 525's maiden flight was planned for late 2014.〔("Bell Helicopter Reveals the Latest in the Bell 525 Program during HELI-EXPO 2014" ). Bell Helicopter, February 25, 2014.〕 PHI, Inc. is the launch customer for the type.
After a six-month delay, the Bell 525 took its first flight on July 1, 2015. Bell expects certification in 2017.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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