VXX Competitors Match General Electric CT7s
To maximize US content in its VXX Presidential helicopter bid, Lockheed Martin has announced its proposed US101 will be powered by three General Electric CT7-8E turboshafts. Sikorsky Aircraft meanwhile bases its VH-92 entry on two more powerful CT7-8C engines from the same manufacturer.
Current versions of the Anglo-Italian EH101 fly with Rolls Royce-Turbomecca RTM322 or General Electric CT7-6 turboshafts. The CT7-8E intended for the US101 is rated around 2,500 shp. The CT7-8C of the VH-92 is a 3,000 shp class engine. GE explains exact ratings will be finalized to meet the airframer requirements.
FAA certification of the CT7-8E engine for the US101 is targeted for some time in 2004. CT7-8C testing for the military H-92 is scheduled to begin early the same year. The CT7-8C differs from the -8 engine in the civil S-92 in having a three-stage rather than a two-stage power turbine. It also incorporates improved materials in the high-pressure turbine. The combined effect of the changes is 18 to 25% more power than the CT7-8.
GE Aircraft Engines is working closely with each airframer to deliver flightworthy engines to meet each aircraft development schedule.
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