I found a very interesting video demonstrating the 1992 GM Ultralite Concept Car. What a blast from the past!
This project, like all concept cars, was well before its time. They had some cutting-edge engineering that went into this vehicle to work towards several goals.
Reducing vehicle weight was important, so carbon fiber materials were utilized to decrease the weight of the body/chassis. Efficient drive-train options were also developed, including the use of two-cycle engines and battery power.
Designing for great aerodynamics was also considered.
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Many years have passed by, and some things were right on, some were not. Aerodynamics have been improved. Lighter weight materials have been used as composites have been working their way into vehicles, though it has been SMC/BMC reinforced with Fiberglass rather than Carbon Fiber.
Gull-wing doors have not been adopted for family cars, and I am not sure if I am disappointed or not.