to novel trends, OMC entered the snowmobile industry with enthusiasm, introducing the Evinrude Skeeter and the Johnson Skee-Horse in 1964, each sure to thrill riders with speeds of more than 30 miles per hour. Another innovation was the Evinrude Aquanaut for skin diving, also sold under the Johnson tradename Air-Buoy. Consisting of a floating gasoline-powered compressor, the unit supplied air to two masked divers at the same time. Another breakthrough was the loop-charged outboard, devised after the company went back to powerboat racing for the first time since World War II. By October 1967, OMC's fiscal year-end sales had reached $233.4 million. Of this amount, 10 percent came from power mowers, with golf carts and utility vehicles sharing second place at 7 percent, and with snowmobiles, the fastest-growing segment of the business, also at 7 percent. Chain saw sales accounted for 4 percent of the final figure, while a full 70 percent came from marine products. The only failure of the decade was the boat-building enterprise; initially small operating losses grew each year, until the line was sold to Chris-Craft in 1970. Otherwise, the 1960s had been lucrative, as the 1969 net sales figure of $327.1 million showed. Retrenchment and Reorganization in the 1970s The 1970s began with a dip to $304.5 million in net sales. This was partly due to the unprofitable boat line, and partly to a line of tent campers that had never fulfilled expectations after the 1967 acquisition of their manufacturer, Trade Winds Campers. The company discontinued the line in 1971, and immediately saw the improvement in their net sales figures, which soared to $394 million by 1972. There were other disappointments. Golf cart sales sank to 2 percent of overall revenue by 1974, and were discontinued in 1975. Chain saw sales totaled $19.1 million in 1976, resulting in losses for the company and reflecting a flattening of future market potential. OMC discontinued them the following year. Snowmobiles, constituting about 4 percent of sales volume in 1972, were offered in 1973 with an optional Wankel engine costing about $235 more than the conventional motor. Though this was the United States's first introduction to the revolutionary rotary engine, OMC's hopes of success were dashed by heavy competition from other snowmobile brands, as well as by two winters of sparse snow. Snowmobile production came to an end in 1976, after a fiscal 1974 operating loss of $13.9 million.