Majid Hazeri - Department of mechanical and aerospace engineering of Science and Research Branch, Islamic Azad University, Tehran, Iran
Shahram Azadi - Department of mechanical engineering of Khaje nasir University, Tehran, Iran
Ali Mahmoudi - Department of mechanical and aerospace engineering of Science and Research Branch, Islamic Azad University, Tehran, Iran

Nowadays using the hybrid system for having better efficiency and less fuel consumption is common in cars. But for the airplanes, the story is completely different almost all of the airplanes are still using the ordinary air engines and the aviation industry is not interested in using hybrid energy, maybe one of the most important issues for using thehybrid system is the weight of this system. this article offering a new mechanism that mixing the electric motor and an internal combustion air engine with contra-rotating technologies for gaining better power efficiency and less fuel consumption calls the hybrid engine design. this technology has the same advantages as hybrid cars, brings more safety, and helps to make environment-friendly airplanes, manage fossil fuel consumption, and finally introduced the new generation of aircraft engines

hybrid, electric motor, hybric tecnologies, contra-ratating