Aerospace Engineering - Tech Update 5 Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

Technology Update

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BAE Systems provides vision and guidance

An enhanced visual guidance system (EVGS) developed by BAE Systems was successfully demonstrated during flight trials in Everett, WA. The company is now offering the system as an option to its visual guidance system (VGS) head-up display. The EVGS overlays a transparent infrared image on the VGS so the pilot can see both the VGS symbology and the terrain/airport environment simultaneously in low-visibility situations. The system improves situational awareness not only during approach and landing, but also during ground operations and takeoff.

The company is taking a modular development approach toward a fully integrated EVGS. Within two years, millimeter-wave imaging radar will be offered with the system, further improving situational awareness.

The EVGS sensor and image processing system is mounted in the aircraft's radome, which is modified to add a small infrared transparent window. Total installed weight of the unit is 22.5 lb, including wire harness, brackets, connectors, and radome modification.

Initial certification of the system is planned on a U.S.-based Bombardier Global Express aircraft for June 2001. The company is offering the system to operators of the Bombardier Global Express, Gulfstream-IV and V, and the Boeing BBJ.

Frank Bokulich


Blended winglets flown on Boeing 737-800

Blended winglets...Hapag-Lloyd Flug was the first airline to fly the Boeing 737-800 with blended winglets. The German airline, which was the airplane's launch customer in 1998, provided one of its 737-800s for certification testing of the new device. Aircraft equipped with these winglets are expected to enter service early next year. Aviation Partners Boeing, a joint venture that offers blended winglet technology for in-service Boeing aircraft, will retrofit Hapag-Lloyd's current fleet of 737-800s with the device.

Unlike traditional winglets, which are typically fitted at abrupt angles to the wing, this new advanced blended design gently curves out and up from the wing tip to reduce aerodynamic drag and improve performance. Placing the winglets on the 737-800 extends the aircraft's range by more than 150 mi. It also improves cruise fuel efficiency by up to 6%, reducing gate-to-gate fuel consumption nearly 5%. The winglets enabled a payload increase of up to 6000 lb, and the aircraft's takeoff performance was improved for high-altitude airports, in hot climate conditions, and at obstacle-limited airports.

Frank Bokulich


Improving engine durability and emissions

A collaborative effort to improve jet engine performance and power generation is being facilitated by the Ohio Aerospace Institute (OAI), bringing together Advanced Fuel Research of East Hartford, CT; the Air Force Research Laboratory at Wright Pattersion AFB in Dayton, OH; Arnold Engineering and Development Center at Arnold AFB in Tullahoma, TN; the NASA Glenn Research Center in Cleveland, OH; Pratt & Whitney; General Electric; and Rolls-Royce. The group is working to commercialize advanced instumentation that will enable jet engines to operate at higher combustion temperatures to increase efficiency while also improving durability and emissions. The U.S. Department of Energy is primarily funding this program through the Small Business Innovative Research (SBIR) grant to Advanced Fuel Research.

The focus of the program is to develop a high-speed pyrometer, an optical instrument used to measure and monitor the surface temperature of jet engine blades coated with a ceramic layer. The ceramic coating provides a thermal barrier to the metal substrate, allowing the engine to operate at very high combustion temperatures. Traditional measurement techniques, thermocouples, and pyrometers operating near visible wavelengths cannot be used with ceramics. Advance Fuel Research studied the optical characteristics of ceramic materials and designed an instrument to meet the measurement requirements. The prototype pyrometer has been tested in jet engines and is expected to reach the marketplace within the next year.

Frank Bokulich

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Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.