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Development of a light structure with composite materials is one of the key technologies to realize an economic HSCT(High Speed Civil Transport). FHI(Fuji Heavy Industries) has continued to investigate heat resistance polymer (thermoplastic polyimide) matrix composite materials and their application to aircraft structures since 1987 jointly with MTC (Mitsui Toatsu Chemicals), Inc[1, 2 and 3]. FHI has started Ti Honeycomb Sandwich Panel Development and Fiber/Metal Laminate Development for high temperature aircraft structures. The status of above studies FHI has ever investigated and the concerns for future studies are summarized herein.

We have recently developed the SEEC-T (Subaru Exhaust Emission Control - Thermal and Thermodynamic Control) system that meets the 1977 emission standards of the United States including California and the 1976 standards of Japan without catalytic converters or thermal reactors, and which will satisfy the more stringent emission standards expected in the future. The SEEC-T system reduces HC, CO and NOx by the following three means. First; air fuel ratio is set leaner than stoichiometric by improvements in the carburetor. Combustion gas temperature is controlled by EGR and ignition timing control. Introduction of secondary air into the cylinder by backflow from the exhaust port improves combustion at light load driving. These means reduce the three emission components within the cylinder. Second; exhaust port liners inserted in a Siamese type exhaust port reduce HC and CO discharged from cylinders by holding the exhaust gas at higher temperatures.