sentences:  Luthe’s first designs at NSU were the second-generation NSU Prinz 4 and the NSU Wankel Spider.The Prinz had a distinct resemblance to its contemporary Chevrolet Corvair; the original design had already been finalized when BMW launched its new 700 model in 1959, with a very similar design.NSU management decided that changes were needed, and an NSU board member who had just returned from the United States described the Corvair design to Luthe, who incorporated some of the elements into the Prinz's "bathtub" design.