I have a great design that i know will work but i do not have the materials to make it maybe you can give it a shot. Its called a Mobile Drone Case its a cellphone case that acts as Personal Drone that can follow you around and perform task changing from Air Mode, Land Mode, Water Mode and Security Mode. The case will be made fully from plastic and only the motors are mechanical. Also each part can be customized and changed. I already have the blueprint made so if you are interested contact me at vertbell@gmail.com so i can send them to you. Thanks