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Technical Paper

YF-23A HYDRAULIC MANAGEMENT SYSTEM

1992-10-01
922028
The YF-23A Advanced Tactical prototype Fighter was a revolutionary statically unstable, twin engine aircraft that cruised at supersonic speeds without afterburner and was designed to out maneuver opponents at subsonic and supersonic speeds. Combining these capabilities into a chosen aircraft configuration demanded a flight control hydraulic system of unprecedented power and performance. Increased system reliability, and reduced maintenance also presented a challenging system design. The YF-23A's unique flight and maneuvering envelope required high surface rates and large actuator excursions at low flight speeds, as well as power to generate increased hinge moments at supersonic speeds. To achieve these specifications, Northrop developed a hydraulic system that utilized flow conservation and prioritization techniques. The hydraulic system configuration was maintained by using hydrologic, as well as electronic control.
Technical Paper

YJ101/YF-17 Flight Test Experience

1976-02-01
760932
The new approach used for the YJ101 development program has produced achievements which are applicable to future engine programs. A description is presented of the YJ101 engine as well as the unique development program leading to flight qualification. Two specific achievements are reviewed; first, the inlet-engine compatibility, and second, engine life evaluation. The inlet compatibility program established specific steps to be followed to achieve stall-free engine operation. The objectives of each step are reviewed. Realistic engine development testing is recognized as a key requirement for the engine industry. Correlation of factory testing with service usage is important to the development of a methodology for engine testing. An analysis of the actual YF-17 engine operation is made and compared to factory development testing. Further development of these concepts is required.
Technical Paper

YOUR LIVING ROOM ON WHEELS

1956-01-01
560148
From mohair plush to woolens, to patterns and now synthetics - that's the growth of automotive fabrics. The 1956 models have gig-finished woolen system broadcloths, tweeds made with spun yarns, Jacquards with spun and filaments, dobby patterns on both woolen and worsted systems and a wide use of boucle or novelty yarns. Fabric designing has become a highly specialized art, attuned always to the stylists' demands. Abrasion, dye stability and light fastness, durability, shrinkage and stretch, cost, spotting and water repellency are all important factors. Where physical requirements are about the same from all automobile manufacturers, they greatly vary in interpretations of results. Where do we go from here? There are synthetics yet untried; some may be blended with natural fibers. By taking the textile supplier more into their confidence, automobile builders would help chart the course ahead.
Article

Yanfeng shows autonomous vehicle interior concepts

2017-10-08
Invisible A-pillars, hidden air vents, moving floor consoles, power rotating seats, color-changing overheads, and other non-traditional interior features will soon redefine the vehicle cabin.
Technical Paper

Yanmar Diesel's Rotary Engine Chain Saw

1976-02-01
760642
A new chain saw powered by rotary engine has been developed with a view to prevent the current injuries due to vibration from chain saws. This paper covers the construction of the rotary engine and performances of the new chain saw including vibration measurements. Vibration acceleration of the new chain saw shows so low level compared with reciprocating engine saws that it would be quite promising for prevention of the vibration injuries.
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