We are Kray Technologies from Kyiv, Ukraine and we created a drone that is based on a hybrid power system, which uses combustion as a primary power source converting the chemical energy into electricity. If the combustion power source fails, electrical rotors continue to use on-board battery to enable safe landing.
Follow us at: http://kray.technology and   / kray.technologies  

Our UAS is equipped with autonomous navigation software enabling safe and precise landing. Our computer vision technology allows 30 centimeters precision landing and takeoff without GPS and without any need for participation on behalf of the customer.