The Marchetti cam-action airplane engine is based on a fascinating principle. The mechanism is inherently balanced. Rotation speed is half that of a regular radial engine because it takes half a revolution to make all cylinders complete a full stroke and return to their original position. The butterfly shaped cams act as a flywheel. Therefore rotational damping can be tuned by increasing or decreasing their weight at the cost of total engine weight. In my spare time besides my study at university I have been working on modelling, developing and building this engine. The purpose of this web page is to publish the research such that others may build and develop their own versions of the Marchetti cam-action principle. All necessary information to understand and build the engine is openly accessible and free to use. Enjoy!