Antonio Sanchez Engineering
Hybrid piston-in-rotor rotary engine. Includes technical background with animations. [English, Spanish]
Ball Piston Engine
Simple and smooth engine concept featuring ball bearings in both rotor and stator. Includes publications, technical background and drawings.
Felix Wankel Homepage
Information source on the Wankel engine technology. Includes technical discussion, animated pictures and vehicle reviews. [English, German]
Freedom Motors
Explains the basics of the Freedom engine, based on the Wankel rotary engine. Includes historical and technical background, news, FAQs, applications and contact information.
FutureWatch: From the Piston to the Wankel to the Quasiturbine
Describes the advantages and limitations of the quasiturbine technology. Includes pictures and discussion forum.
HowStuffWorks - How Rotary Engines Work
Explains the rotary engine technology. Includes technology background, photographs and animations.
Oscillator Engine
Innovative internal combustion engine technology substituting pistons by flaps. Includes technical background, animation and diagrams.
Ring Engine
Explains the basics of the ring engine technology. Includes technical background, animations and discussion. [English, German]
Rotary Engine Illustrated
Resource for educational material. Addresses technical background with pictures and animations.