One of the current trends among micro-quadcopter enthusiasts involves modifications that purposely keep their flying machines at ground level. This floor-hugging tweak is called the Tiny Whoov. It is a micro RC hovercraft built around the uber-popular Blade Inductrix quadcopter.
There are several different ways to get a Tiny Whoov of your own. A cursory web search reveals many step-by-step tutorials, a few manufactured conversion kits, and even an off-the-shelf hovercraft from Blade, the Inductrix Switch. All of the links I found are based on the Inductrix (or one of the many clones).
I wanted to build a Tiny Whoov, but I still enjoying flying my Inductrix in stock form. So I wasn't keen on clipping its wings. Undeterred, I decided build my own variation on the quadcopter-to-hovercraft theme using a different micro-quad. I improvised a simple design while taking copious inspiration from the Tiny Whoov.
The Tiny Whoov uses only the front two rotors as lift fans for the hovercraft. The rear rotors are used to propel and steer the vehicle via differential thrust. With this setup, the same control and gyro settings that work as a quadrotor will also work in hovercraft mode…sort of. More on that later.
For the quadcopter, I used my venerable Heli-Max 1SQ. You may recognize it from my recent Christmas tree drone. Although I didn't know it at first, the modular construction of the 1SQ made it ideal for this project. But don't worry if there isn't a 1SQ on your shelf. The basic components of most mini-quads are the same. I suspect that you can crank out a similar hovercraft with whatever quad you have on hand.
There is nothing fancy about the design or materials that I used. Most of the hovercraft hull was constructed with cheap foamboard and hot glue. One sheet of foamboard from the dollar store is adequate to build several of these things.