Hover mowers I think were developed in Great Britain. They're main purpose is to trim very steep, small slopes of grass, such as golf course sandtraps/bunkers. Over there, the edges of their golf course sand traps tend to be fairly steep. The hover mower (of which there are/were several manufacturers, Hover Mower, being on of them) looks like a push mower without wheels. The deck or shroud in kind of dome shaped with the engine sitting on top of it. The handle then attaches to the back two corners of the deck, just like a push mower, only no wheels. Underneath the deck is a big metal disc that has moveable flail blades that are about four to five inches longs. There's also a vented impeller that sits between the metal disc and the deck. When the engine starts and the impeller/disc starts to spin, an air flow is created which lifts the whole unit up off the ground. The flail blades then cut the grass. So what's so special about that, you might ask? Well, the engine is built so that it can operate at almost a 90 degree vertical angle. Thus, the steep sand traps can easily be trimmed. In addition, the air current allows the unit to be used over water for trimming lake and pond edges. It is really a cool machine. I used to own one when I had my part-time lawn care company. I had a really steep, but narrow and long hill at a cemetery I used to care for. Too steep for a walk behind and the ankles took a beating standing on it when using a string trimmer. Also, hooking ropes to a regular push mower and dragging it back on forth worked somewhat, but it was awkward and cumbersome. With the hover mower (and I did own a Hover Mower brand model) I could stand at the top of the hill and easily mow the hill by gently swinging the mower back and forth with ease. You should have seen the stares I got by people passing by. They were/are pricey though, but well worth the physical labor savings. I was also able to use it around my pond at home. Glided out over the water with no problems. It was a cool piece of equipment.