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26 juin 2014 4 26 /06 /juin /2014 07:20
Boeing Phantom Swift Joins VTOL X-Plane Competition


25/06/2014 by Paul Fiddian - Armed Forces International's Lead Reporter


Boeing's Phantom Works division believes its entry into DARPA's VTOL X-Plane competition could shape the next generation of vertical takeoff and landing-capable aircraft designs.


In February 2013, DARPA (the US Defense Advanced Research Projects Agency) reached out to industry for future VTOL aircraft concepts. Its VTOL X-Plane search involves types with a high payload capacity that can reach and maintain high flight speeds but also hover very efficiently. "We are looking for true cross-pollinations of designs and technologies from the fixed-wing and rotary-wing worlds", DARPA's Ashish Bagai commented at the time.


Boeing's Phantom Swift concept is essentially an aircraft-helicopter hybrid of the type required. So far, Phantom Works has developed, built and test-flown a scaled-down technology testbed and, in March this year, the Phantom Swift officially joined the VTOL X-Plane programme as a competing design.


Boeing Phantom Swift


Boeing's Phantom Swift is equipped with a pair of large fans, fitted internally, which supply vertical lift. When the aircraft moves between vertical and forward flight, these fans stop supplying power and wingtip-placed fans take over. The same fans on the wingtips are used to enhance stability when the Phantom Swift is in hover mode.


Boeing says that, with this fan arrangement, the Phantom Swift is at least 50 per cent more efficient in the hover than a typical helicopter. It's expected to have a top speed of 740 kilometres per hour and, according to the US defence/aerospace firm, the Phantom Swift's configuration template could be replicated in other designs, ultimately creating a whole developmental series.


Phantom Swift: VTOL X-Plane


The full-sized Phantom Swift will have a wing span of 50 feet (15.2 metres) and a fuselage length of 44 feet (13.4 metres), weighing in at 12,000 lb (5,450 kilograms).


"The combination of body-fans and tilt-wing fans for improved controllability is the unique feature of the Phantom Swift", Boeing's Brian Ritter told media representatives today. "In the challenge of efficient hover and high-speed flight the answer is in ducted-fan technology, and this is something that Boeing is now investing heavily in."


Four competing designs are involved in the DARPA VTOL X-Plane competition, which is currently in its Phase 1 stage. Phase 3, the final stage, will see the winning design selected.

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23 mars 2014 7 23 /03 /mars /2014 12:20
Phantom Swift photo Boeing

Phantom Swift photo Boeing


20.03.2014 Romain Guillot journal-aviation.com



La DARPA (Defense Advanced Research Projects Agency) a finalement sélectionné quatre finalistes pour la phase 1 du programme VTOL-X. Après Sikorsky en décembre et Aurora Flight Science le mois dernier, l’agence de recherche américaine pour les programmes de défense a annoncé que Boeing et Karem Aircraft participeraient également au programme.


Boeing proposera évidemment son Phantom Swift, dont un modèle réduit conçu en à peine un mois a déjà volé dans un hangar de Philadelphie en septembre 2013. Karem Aircraft mise quant à lui sur un appareil avec propulseurs basculables.


Les différents acteurs ont maintenant 22 mois pour finaliser leur projet, le gagnant qui sera retenu par la DARPA devant pouvoir tester son concept en vol entre 2017 et 2018.


Rappelons que l’objectif final du programme VTOL-X est de concevoir (phase 2) et faire voler (phase 3) un démonstrateur capable de décoller et atterrir verticalement, tout en permettant des vitesses en palier comprises entre 300 et 400 nœuds. Le démonstrateur devra aussi être capable d’emporter une charge représentant au moins 40% de sa masse maximale, comprise entre 4,5 et 5,4 tonnes.


La phase 1 est partiellement financée par la DARPA, à la différence des phases 2 et 3 complètement contractualisées. La totalité du programme VTOL-X représente une enveloppe de 130 millions de dollars.

VTOL-X concept Karem Aircraft

VTOL-X concept Karem Aircraft

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