Detail No More Whirly-Splat   Oleh:  [s.n] Jenis: Article from Bulletin/Magazine Dalam koleksi: The Economist (http://search.proquest.com/) vol. 402 no. 8774 (Mar. 2012), page s6. Topik: Whirly-Splat; Helicopter; Hybrid-Electric Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.70 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel If a fixed-wing aircraft loses power, the pilot can at least rely on the wings to provide lift until the plane's forward velocity falls below its stall speed. A helicopter, by contrast, derives both propulsion and lift from its blades. If they stop rotating, a rapid and terminal encounter with the ground beckons. To prevent that, the blades of most helicopters have a special clutch that disengages them from the engine if the engine stops. The pilot must then change the pitch of his craft to let it enter a mode called auto-rotation, in which the rush of air as it descends keeps the blades whirling, thus providing lift that slows the fall. Both of these man-oeuvres would be less hazardous if the pilot could call on a second source of power to turn the blades for a few seconds while he was performing them, and Jean-Michel Billig and his team at Euro-copter (part of EADS, an aerospace and defense group) hope to provide just that. They are introducing the fashionable idea of hybrid-electric drive into helicopters. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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