I saw someone on YouTube build a hovercraft, thought it was too cool not to try, and there were no plans — so I set out to figure one out myself. This is that early experiment: how a hovercraft floats, the flaw the ground kept exposing, and the RC running gear that made it go.
A hovercraft only does two things, and it needs a way to do each. Lift: air is pushed down into a skirt underneath the craft, building a cushion of pressure that floats the whole thing a fraction of an inch off the ground so there's almost no friction. Thrust: a second airflow (or a steered one) pushes it forward and a rudder in that airstream steers it. Take away the friction and even a small motor can scoot a surprising amount of weight around — that's the whole magic of the machine, and the whole reason it's so fun to drive.
The skirt is what traps the air cushion, and it's where a homemade hovercraft lives or dies. Mine had holes in the bottom to distribute the lift air, and the field taught me the lesson fast: the ground was rocky and loose, and the rocks kept getting sucked up into the holes. A hovercraft wants a smooth, flat surface — a gym floor, a driveway, calm water, packed snow. On loose rocky ground the skirt both loses its cushion to the gaps and ingests debris. If I built another, the skirt design and picking better terrain would be the first two things I'd change.
Under the shell it's ordinary RC electronics — the same family of parts as a plane, just arranged to blow air instead of fly:
| Part | Role |
|---|---|
| Brushless motor (Turnigy) | Spins the fan that makes lift and/or thrust |
| 30A ESC (Turnigy Plush) | Controls motor speed and powers the receiver |
| 9g micro servo (HXT900) | Swings the rudder to steer the thrust air |
If those three parts sound familiar, they should — it's a motor, an ESC and a servo, exactly like wiring a simple RC plane. Learn the electronics on one and you can build the other.
The exact Turnigy gear from 2017 has long since rotated out of the shops, so here's what I'd put in the same three slots today:
Why it fits: a hovercraft fan wants the same cheap, proven outrunner a foam-board plane uses — this is the class I stock for those builds.
The spec that matters: a common 2212 size, so mounts and props are easy to find and cheap to replace.
If you upsize the prop or fan: a bigger blade pulls more amps from the same motor — keep the ESC rating above what the combination actually draws.
Why it fits: the build ran a 30A ESC, and the BEC is doing double duty here — it's what powers the receiver and the steering servo, exactly like on a plane.
The spec that matters: 30A with a built-in BEC, so the receiver and rudder servo run without a separate battery.
If you pick an ESC without a BEC: the receiver and servo have no power source, and you'll be adding a separate battery you didn't plan for.
Why it fits: the build steered with a 9g HXT900 swinging the rudder in the thrust air — any standard 9g micro servo does that duty, and a 5-pack leaves spares for the next project.
The spec that matters: the standard 9g size — the same servo that moves control surfaces on my foam-board planes.
If the rudder linkage binds: a stalled micro servo strips its gears fast — make sure the linkage swings freely before you power up.
This was one of my earlier projects and a deliberately rough experiment: no plans, figure it out, see what the ground teaches you. That's still how a lot of the best builds start. If a full hovercraft build video is something you'd want to see done properly — better skirt, cleaner thrust setup — that's exactly the kind of thing the community helps me prioritize. And if you want yours to glow while it slides around after dark, the Wi-Fi LED controller was built for exactly this kind of oddball RC craft.
Auto-transcribed from the video, so expect the odd mis-heard word. Here so you can search or skim what was said without watching.
How do I say it? Like, hi America Shay. Just say hi America. Hi, my name's Eric. I decided to build myself a hovercraft.
I saw someone on YouTube, they built theirself a hovercraft and I'm excited it was really cool. There was no plan for it so I decided to take on the challenge myself to build one. So these holes in the bottom, the ground is all rocky. And the holes in the bottom, the rocks get in there. So there's a lot of rocks in there.
They're trying to run them out. Last time we did this, one got in the motor and broke a top. We're trying to not do that again. Thanks for watching. Please like and subscribe for more videos.
