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Aviation History
2003
2003 - 2262.PDF
HEADLINES AIR TRANSPORT GUY NORRIS / EAST HARTFORD P&W unveils 7E7 engine concept PW-EXX powerplant has a two-spool, counter-rotating design, aimed at meeting Boeing's fuel consumption target Pratt & Whitney has revealed details of its proposed PW-EXX engine for the 7E7 project in the run-up to Boeing's year-end decisions on pow erplant partners and the formal launch of the programme. P&W PW-EXX programme direc tor Peter Smith says the outline con figuration is a two-spool, counter- rotating design with a direct drive fan made of 24 "dual arc" wide- chord, hollow blades. Chasing Boeing's fuel consumption target of a 15% improvement over the 767- 300ER, P&W's optimisation studies have covered over 23 fan pressure ratio/jet velocity ratio combina tions, nine overall pressure ratio/tur bine exit temperature cycles and four pressure ratio split cycles. Thrust range is likely to be around 68,000-69,0O01b (302- 307kN) says Smith. "We're looking at whatever we have to do to meet the "book ends" around both 8,000nm and 500nm, which is a huge range to meet with one engine. We are all looking at innov ative ideas to solve this equation." Latest projections suggest a fan diameter of around 2.84m (112in) and a high pressure compressor (HPC) pressure ratio of 20:1 versus 17:1 on the General Electric/P&W Engine Alliance GP7000 and 11:1 on the PW4000. The fan, which is based on the GP7000 design, will be surrounded with an aluminium iso- grid containment case, and down stream will feature integrated fan exit guide vanes leading into a four- stage low pressure compressor. The HPC is a 10-stage unit based on the military F119 design, and will be made up of integrally bladed rotors to save weight and eliminate a potential failure mode. "We're planning to kick-off tests of this compressor by the end of 2004," says Smith, who adds the unit will have the same average compression P&W is vying with GE Aircraft Engines and Rolls-Royce to build the 7E7's powerplant ratio as the F119. The diffuser/com- bustor design will include a two- piece diffuser case and the next gen eration Talon X burner. To meet the "more-electric" needs of the 7E7, it will be fitted with a core mounted gearbox and will have reduced bleed air offtakes for improved efficiency. Assuming selection over either a GE or Rolls-Royce bid in what it expects will be a two-horse race, P&W plans to formally start the PW- EXX effort in the third quarter of 2004. To ensure a fully mature propulsion system at service entry, it plans to alter its development timescale by shortening the detailed design phase while lengthening the test phase by three months. Compared with the 777 pro gramme, the result will be a 10- month saving in bringing the first engine to test, a 21-month saving on the 747SP testbed programme, an 18-month saving on the fan blade out test, and 17 months on completing the 3,000 cycle ETOPS/ service ready test. DEFENCE India signs IAI Phalcon agreement India was due to sign in New Delhi on 10 October a deal to acquire three Israel Aircraft Industries (IAI) Phalcon airborne early warning aircraft. The AEW systems will be mounted on Russian-built llyushin ll-76s. Russian industry will perform part of the modification and will receive royalties on any further aircraft sold to export customers. IAI and the Indian air force have held talks over late changes to system configuration. The ex tra features have raised the price India will pay to $1.25 billion. IAI will not provide details, but it is understood that the radar- the Phalcon's main sensor-will be capable of detecting and iden tifying targets at longer ranges. BUSINESS AVIATION Cessna selects Garmin integrated avionics for piston-single families Cessna has selected Garmin G1000 integrated avionics for its 182 Skylane and 206 Stationair piston- single families. The package, featur ing two 265mm (10.4in) liquid- crystal displays, will be available as a factory-installed option beginning in the second quarter of next year. The G1000 has already been selected for Cessna's Citation Mustang entry-level jet, as well as Diamond's piston-powered DA40 and DA42, and makes the 182 and 206 competitive with the Avidyne Entegra-equipped Cirrus SR20/22 and Lancair Columbia 350/400. In addition to primary flight and multifunction displays, the Garmin suite includes a solid-state attitude and heading reference system that can be aligned while the aircraft is moving, even in flight; digital air- data computer; dual radios, navi gation receivers and GPS receivers; Mode S transponder with traffic information system; and datalink weather using the XM Satellite Radio network, which also pro vides in-flight entertainment. The G1000 system will be offered as the Nav III option on the 182T, 206H and tur- bocharged T182T and T206H. Introductory pricing of the GlOOO-equipped Skylane is $297,500, 12% less than a 182T with the current Honey well Bendix/King Nav II option, while the Turbo Sky lane with Nav III package will cost $25,000 more than a Nav The II-equipped T182T. Cessna says dealers have placed orders for more than 300 GlOOO-equipped aircraft. Garmin says the G1000 will be certificated on the Diamond DA40 by January next year, followed by the 182. SEE NBAA SHOW REPORT P21 G1000 features two 265mm LCDs 4 14-20 OCTOBER 2003 FLIGHT INTERNATIONAL www.flightinternational.com
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