By M. Arjomandi, N. K. Liseytsev
Airplane layout three (2000) forty nine - fifty six
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Extra info for A simplified method for estimating the take-off weight for short-haul transports
Courtesy of USAF Fig. 13 Upper diagram illustrates the positioning of the two Pratt & Whitney F100 EMD low-bypass afterburning turbofan engines embedded within the fuselage of a McDonnell Douglas F-15 Eagle fighter aircraft fitted out for a NASA control study . Side schematic view of an F100 EMD engine shown in the lower diagram. 4 Integration of the Propulsion System to the Flight Vehicle 15 Fig. 14 Bottom view of the Boeing/Lockheed Martin F-22 Raptor fighter aircraft, at left. Note the faceted/angled geometry of the front air intakes and the exhaust nozzles for the two embedded engines (engine: Pratt & Whitney F119-PW-100 afterburning low-bypass turbofan with vectorable exhaust nozzle), meeting the needs for traditional engine operation as well as producing a low radar and heat signature (stealth requirement).
The respective government is also aware that a suitable balance must be struck in stipulating minimum acceptable safety compliance that can be met at a reasonable cost, versus an excessive cost. Concluding 10 Fig. 8 1 Introduction to Aerospace Propulsion Jet engine nacelle positioned beneath the wing (left) and at the rear fuselage (right) on a positive note, new technology and processes continue to appear and be developed, helping to move the regulations toward greater safety. 4 Integration of the Propulsion System to the Flight Vehicle Any discussion of the viability of propulsion systems will ultimately lead to how well the propulsion system will couple to the prospective flight vehicle, and by extension, how well the propulsion system will perform once installed and operating in flight.
Several representative examples are provided below to give the reader a sense of the issues associated with propulsion system integration. 1 Engine-Airframe Integration for Airplanes Aircraft engines for modern subsonic civil airliners are usually pod-mounted, for good aerodynamic intake performance (‘‘clean’’ undisturbed air, away from airframe interference) and for ease of access for engine maintenance and repair . 4 Integration of the Propulsion System to the Flight Vehicle 11 Fig. 9 Schematic diagram of pylon-mounted turbofan engine nacelle placement under the wing of a Boeing 737.