H HighRPM New Member Joined May 12, 2016 Messages 3 Reaction score 5 Dec 2, 2019 #1 Who knows the HUF rotary piston engine? Who has already built such a motor? Attachments US3410254A Huf Motor_3.jpg 39.2 KB · Views: 64 HUF Rotary Piston Engine N1.pdf 1.4 MB · Views: 28