<div class="section abstract"><div class="htmlview paragraph">THE RESULTS of analytical studies backed by actual tests concerning the use of supercharging in the free-piston cycle are reviewed. They indicate that, under conditions of increased cycle pressure ratio and of adequate cooling of the air, supercharging has power possibilities far beyond those which might even optimistically be hoped for from naturally aspirated operation. Also, supercharging can be used to effect a significant reduction in part-load fuel consumption.</div><div class="htmlview paragraph">Also discussed are: The possibility that further developments beyond present pressure and lubrication borders can further raise the goal of maximum practical power gain through supercharging; series operation of supercharger and gasifier, and the mutually related problems of supercharger drive and of matching the characteristics of the plant components. The elimination of intake air pulses is a factor in adaptability of the free-piston powerplant to almost universal applications.</div></div>