LiquidPiston has unveiled a prototype of the power dense X Mini gasoline engine. The 70cc rotary engine is quite small and simple; with just two moving parts, it fits in a box as small as 6.6 inches by 6.2 inches by 5.4 inches. In testing, the X Mini produces 3.5 horsepower at 10,000 rpm, but LiquidPiston expects the final product to weigh just three pounds and produce more than five horsepower at up to 15,000 rpm. The X Mini could be used to power lawn equipment, UAVs, mopeds, EV range extenders and the like, as well as new applications not yet discovered. LiquidPiston also says its low NVH will help with comfort and product life. Read more in the press release below.