Installation de winglets: Quel coût pour quelle rentabilité?
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elmer
Inscrit le 27/09/2005 |
# 20 juin 2007 14:01 | |
C'est bon, j'abandonne aussi...  |
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Beochien
Inscrit le 13/02/2007 |
# 1 novembre 2007 14:41 | |
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Bonjour Ca avais bien commencé pour les winglets ... 1+1 ça fait pas 2 JPRS _________________ JPRS |
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Beochien
Inscrit le 13/02/2007 |
# 2 juin 2008 12:35 | |
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Bonjour Aviation Partners ... un grand négoce que ces Winglets ... et 6% annoncés sur le 767-300, de plus vu les retards 787, la solution Winglets est même commandée avant homologation .. Bon, Airbus fera moins bien sur le A330 avec sa prochaine évolution moteur chez RR (4-5%) !! Vraiment et seulement des ailes trop bien faites chez Airbus ???  Et Aviation Partners spécialisés dans les fers à repasser de Boeing Quand même qq questions à se poser !! Du Herald ... J'ai repêché ce vieux thread, ne sachant ou le poster celui là !! http://www.heraldnet.com/article/200806 ... 15497/1005 JPRS Paris _________________ JPRS |
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sevrien
Inscrit le 08/08/2006 |
# 30 juin 2008 17:16 | |
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Lien : DATE:27/06/08. SOURCE:Flight International Fuel price surge highlights worth of winglets By Max Kingsley-Jones While winglets have been available as an upgrade for airliners for decades, the sudden rise in the cost of fuel has seen demand surge as operators aim to eke out every last bit of efficiency from their aircraft. The Boeing 737 is the only mainline airliner in production to be offered with winglets as an option. The airframer says the upgrade can reduce fuel consumption (or boost range) by up to 4%. Airbus has been evaluating winglet designs for its A320 family and is about to launch a third round of test flights using a design developed by Aviation Partners. If successful, a decision to offer the upgrade could be made before year-end. ..... Le rest de l'article est intéressant, aussi ! |
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sevrien
Inscrit le 08/08/2006 |
# 30 juin 2008 17:26 | |
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Lien : http://www.flightglobal.com/articles/20 ... mtion.html DATE:27/06/08. SOURCE:Flight International As fuel costs spiral, winglets are a simple way for airlines to cut fuel consumtion The biggest single "bolt-on" performance enhancer for airliners has been the blended winglet, developed jointly by Aviation Partners and Boeing in 1999. Originally designed for the Boeing Business Jet, they appeared in 2000, but their transfer to the 737-700 and -800 (and later the -300/500, 757 and 767) proved so popular that more than 1,750 blended winglet systems are in service with at least 100 airlines in more than 40 countries. Yet the technology is relatively simple. As an aircraft flies, the disturbed air moving across the upper wing surface produces vortices at the wingtip. The blended winglet is shaped with a large radius and a smooth reduction in chord that controls the air and produces much smaller vortices at the tip. The result is reduced drag, which translates directly into improved fuel consumption of between 4% and 6%, and better aerodynamic performance from increased lift. For a 737-700/800, the winglets are 2.5m (8.2ft) high, with a chord variation tapering from 1.2m wide at the base to 0.61m at the tip. They also increase the wingspan by 1.37m. ....Détails techniques fournis (simples à comprendre). ------------------------- Although the 737 winglets weigh about 55kg each, this is more than offset by typical fuel savings of between 4% and 6%, or an increase in range of 240km/h (130nm) for the -700/800 and 195km for the -300. Payload increases are 2,630kg for the -800, 2,315kg for the -300 and 2,000kg for the -700. Given the spiralling price of fuel, these savings mean that the return on investment (see table) is achieved in a shorter period of time. Retour sur investissement ... rapide ! -------------------------------- .....As the installation is relatively simple and can usually be carried out at the same time as a heavy maintenance check, there are now about 30 maintenance facilities around the world carrying out this work. Ce point est important! Installation & entretien non onéreux, et faciles à planifier ! --------------------- The two major 737 customers are Ryanair and Southwest, and both carriers have their eye on cost reductions. Southwest has been an Aviation Partners Boeing customer since 2003, ordering 170 blended winglet sets for retrofit on its 737-700s, but also specifying them for future new-build aircraft. Ryanair ordered 225 sets plus 193 options in February 2005. As well as refits, all new aircraft deliveries from January 2006 have had factory-installed winglets. Il y aura de l'émulation ! ------------------------ Retrofitting on the 757-200 The 757-200 winglets are 2.5m high and give a 2.9m span increase, with a weight of 132kg per shipset plus ballast of 112kg. An additional 355kg comes from outer wing skin replacement, in-tank stringer reinforcement and fastener replacement. Flap leading-edge vortex generators are also installed under a service bulletin. Modification time is nine to 15 days (typically taking less than 3,800h). A modified aircraft gains 370km of range or 4,870kg extra payload. The first winglet-equipped 757-200 flew in April 2005 on an aircraft belonging to Continental Airlines, which has ordered 41 shipsets and options for a further 47 aircraft. The US Federal Aviation Administration supplemental type certificate was awarded just over a month after the first flight, on 23 May. The customer list now includes American Airlines (with 20 orders), Icelandair (seven orders and 31 options) and three corporate 757 operators. BA a installé des winglets sur ses B757-200 de la filiale OpenSkies. ---------------- The 767-300ER has the largest winglets at 3.34m high, adding 3.3m to the aircraft's wingspan, and the heaviest at 243kg per shipset. The wing modifications are the same as for the 757-200, with 109kg of flutter ballast added. Conversion time is expected to take between 5,500h and 7,000h. The operating empty weight and maximum zero fuel weight of a winglet-equipped aircraft are increased by 1,070kg to maintain payload capability, plus there is a 590km range increase. An American Airlines aircraft is being used in an eight-month flight-test certification programme, and Aviation Partners Boeing anticipates it will receive its FAA STC by November. Current customers include American (58 sets), Austrian Airlines (six) and Delta Air Lines (15). The benefits of reduced fuel consumption and improved aerodynamic performance can be realised in a number of ways. With less fuel required for a particular route, a trade-off can be made in favour of greater payload. Alternatively, greater range can bring more destinations into reach with a smaller aircraft, increasing efficiency by better matching capacity to market demand. This could be the replacement of a larger aircraft flying at less than capacity or establishing new direct routes that could not support a larger aircraft. Greater operational flexibility is created by having more lift available. Take-off can be made at a lower thrust setting (typically a 3% derate), using less fuel and reducing engine wear and tear and external noise. Normal thrust levels can produce a steeper climb-out, providing greater obstacle clearance and reducing noise as the aircraft climbs higher, faster. Greater payload can also be carried, particularly from airfields at high altitudes and temperatures or with shorter runways. GOL in Brazil has ordered winglets sets for 60 737-800s and combined them with Boeing's short-field performance package to permit full payload operations from the short 1,320m and 1,940m runways at the Rio de Janeiro (Santos Dumont) and São Paulo (Congonhas) downtown airports. Fuel savings American Airlines is a convert to blended winglets, having ordered them for 77 737-800s and 104 757-200s as well as the 767. It has calculated that for the 757 fleet, depending on fleet utilisation and average sector length, savings will be up to 760,000 litres (200,000USgal) of fuel per aircraft per year, while the 767s should achieve savings of 64-80 million litres and a reduction of 423,000t of CO2 emissions. Once all three fleets are equipped, the airline reckons it will save over 160 million litres of fuel a year. This is in addition to the more than 360 million litres of fuel that it saves annually through its FuelSmart conservation programme. It has also expressed interest in winglets for the Boeing MD-80, with the same design being applicable to the Boeing 717, and Aviation Partners Boeing is considering these variants. Ce sera valable pour les B717-200 ! Pourquoi pas les Fokker-100 et -70 ------------------------ The company expects that more than 90% of Next Generation 737s, 80% of 767-300ERs and over 70% of 757-200s will be flying with blended winglets. C'est important ! ------------------ As of the end of February, it estimated that the winglets have saved over 3.48 billion litres of jet fuel and that, by the end of 2014, this will have climbed to over 19 billion litres. As prices have climbed, the payback, in fuel savings alone, is anticipated at about 2.5 years, on a per aircraft basis, or more than 380,000 litres a year. Investissement intéressant, donc, pour les "cash-strapped airlines" ! With increased interest in emissions from aircraft, the blended winglet has taken on a new significance, as reduced fuel burn translates directly in less CO2 being produced. It is now a "mean and green" product. Bon article ! Sans tous les détails ci-dessus, les points clé ont tous été analysés succinctment, et commentés sur notre Forum déjà ! (Message édité par sevrien le 30/06/2008 17h40) |
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sevrien
Inscrit le 08/08/2006 |
# 30 juin 2008 17:31 | |
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Ceci complète un tour intéressant de la question des winglets. Lien : http://www.flightglobal.com/articles/20 ... nglet.html DATE:27/06/08. SOURCE:Flight International A downdraft on the otherwise wonderful winglet? By John Croft Reports from at least one major airline indicate that blended winglets installed on large commercial aircraft are being damaged or destroyed by lightning strikes as well as by ground incidents, but the overall experience appears to be positive |
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sevrien
Inscrit le 08/08/2006 |
# 13 juillet 2008 00:14 | |
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Article intéressant. Lien : http://www.ana.co.jp/eng/aboutana/press ... 80711.html ANA to Add Winglets to 767-300ER Fleet- In a Japan First, ANA Spreads its Green Wings Wider under its Ecology Plan 2008-2011 - --------------------------------------------------------------- Extraits et commentaires. TOKYO July 11, 2008 - ANA will become the first Japanese airline to add performance-enhancing blended winglets to its Boeing 767-300ER fleet from the coming fiscal year, commencing April 1, 2009. As laid out in its Ecology Plan 2008-2011, which calls for the airline to reduce CO2 emissions, ANA will introduce the carbon fibre winglets to a total of 16 767-300ERs from fiscal 2009, which commences April1, 2009, including the two variants that will be delivered in the current fiscal year. Manufactured by Airline Partners Boeing, each winglet is 3.4m long, 4.5m wide, and will extend the length of each wing by 1.65m. By improving the aerodynamics of the wing, ANA expects to make an efficiency gain of 5%, or a saving of 2,100 tonnes of CO2 per annum for each aircraft. Question d'économies et d'écologie ! -------------- “Enhancing our current fleet in this way underlines ANA’s commitment to flying the most fuel efficient and environmentally friendly aircraft in the most efficient way possible. ................... In January this year, ANA underwent an IATA Fuel Efficiency Gap Analysis (FEGA), which identified areas for potential fuel savings, including the optimization of fuel carried on each flight. Based on the report by the FEGA team ANA has set up an on-going company-wide project to implement the findings, which resulted in the decision to incorporate the 767-300ER winglets. Démarche intéressante. To date, ANA has also implemented other measures designed to reduce fuel burn and related emissions. ....................... The fruits of these efforts were a reduction in CO2 emissions of 11.4% per ASK in fiscal year 2007 compared with fiscal 1990 levels. |
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alain57
Inscrit le 08/03/2008 |
# 23 juillet 2008 19:07 | |
de tous petits winglet en cours de montage pour un 767-300....  http://www.airliners.net/photo/American ... _id=NEXTID |
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Beochien
Inscrit le 13/02/2007 |
# 23 juillet 2008 20:51 | |
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Merci Alain ! Oui c'est annoncé ... et toujours avec 5-6 % d'écos (Cumulées je suppose !) C'est à la hauteur d'une aile quelconque, donc trés améliorable ... pour le 767, comme pour le 737 !! Et bientôt des winglets en point d'orgue !! Pfff Encore une invention pour faire marcher les ailes minables .. Et les bons aérodynamiciens russes, dixit Sévrien .. ils en mettent beaucoup des winglets à leurs avions ??? Et Airbus qui n'avance guère, car ils ont de meilleures ailes aussi eux !! Donc les améliorations sont moins sensibles avec les winglets ...d'où un certain casse tête !! Et de toute façon, les futures ailes plastoc, avec une courbe continue, façon planeurs ou 787-8-9 régleront le PB sans trop d'appendices ... seul petit PB , un surcroit d'envergure .... qu'il faudra bien accepter, sauf de les rendre pliables  _________________ JPRS |
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