Quick Answer
The BetaFPV Cetus X HD is a 2S brushless whoop running Walksnail Avatar HD digital video. It is the step between a 1S indoor whoop and a full 5-inch outdoor drone. At roughly 100g without battery, it handles wind that grounds smaller whoops, flies up to 5.5 minutes, and stays well under the UK's 250g threshold. The catch: it needs Walksnail-compatible goggles, not DJI.
Why 2S Changes Everything for a Whoop
Most pilots start on a 1S whoop like the BetaFPV Air65 or Air75 II. Brilliant indoors: light, safe, cheap to repair. But step outside and a 1S whoop struggles in anything above a gentle breeze. The motors saturate, and your flight becomes a fight against the air.
The Cetus X HD runs a 2S (7.4V) power system. That extra voltage drives the 1103 11000KV motors harder, giving significantly more thrust than a 1S setup. In practice, you can hold position in light wind that would blow an Air65 into next door's garden. It is still a whoop with ducted props, so it survives the inevitable bumps, but it has the grunt to actually move through open air.
The trade-off is weight and crash energy. A 2S 450mAh BT3.0 battery brings the all-up weight to roughly 125g. Still sub-250g, still in the UK A1 Open category, but heavy enough that a full-speed meeting with a tree branch will crack a duct rather than bounce off.
The Walksnail Trap: Goggle Compatibility
Here is the mistake we see most often in support: someone buys the Cetus X HD for the HD video, then discovers their DJI Goggles 3 will not talk to it. The Cetus X HD uses a Walksnail Avatar Mini HD VTX on 5.8GHz. You need Walksnail-compatible goggles, either the Caddx/Walksnail Avatar HD Goggles or the CaddxFPV Ascent, or an analog goggle with a Walksnail VRX module.
Walksnail and DJI are separate ecosystems, not cross-compatible. If you already own DJI Goggles 3 or N3, the Cetus X HD is the wrong drone. Look at the Meteor75 Pro O4 instead. Starting fresh and want a cheaper digital system? Walksnail is the route.
One thing BetaFPV got right on the HD version: a dedicated cooling fan for the VTX. Walksnail Mini VTXs run hot enough to throttle in sustained flight, and that fan keeps video stable through a full pack. The cheaper Cetus Lite has no such provision.
Specs That Actually Matter
| Spec | Cetus X HD |
|---|---|
| Motors | 1103 11000KV brushless |
| Props | Gemfan 2020 4-blade |
| Battery | 2S 450mAh BT3.0 (75C) |
| Flight Controller | F4 2S 15A V1.0 (Betaflight) |
| ESC | BB51, Bluejay 48k firmware |
| Video | Walksnail Avatar Mini HD, 1080p/60fps |
| Receiver | ELRS 2.4GHz |
| Weight (no battery) | ~100g |
| Flight time | Up to 5.5 minutes |
| Flight modes | Angle, Horizon, Air |
The BT3.0 connector is worth knowing about. BetaFPV moved the Cetus X HD from BT2.0 to BT3.0, which handles the higher 2S current with less voltage sag at the plug. If you are buying spare batteries, check for the BT3.0 connector. The older BT2.0 packs fit physically but underperform and run warm. We carry compatible packs in the Cetus collection.
Who Should Buy It
We recommend the Cetus X HD for pilots who can already hover and fly circuits on a simulator or 1S whoop and want to move outdoors without jumping to a 5-inch. It is not a first drone. The 2S power means it moves faster than an Air65, and crashes at speed crack ducts even with prop guards. New to FPV? Start with our Air75 II guide instead.
One note: we sell the bare quadcopter. You also need Walksnail goggles, an ELRS 2.4GHz radio like the RadioMaster Pocket Crush, and a BT3.0 charger like the ViFly WhoopStor V3. For a one-box option, browse our complete kit collection.
Already own DJI goggles? The Meteor75 Pro O4 is the better match. Same whoop class, DJI-compatible video.
FAQ
Q: Can I fly the Cetus X HD with DJI goggles?
A: No. The Cetus X HD transmits on Walksnail Avatar HD, which DJI goggles cannot receive. You need Walksnail-compatible goggles or an analog goggle with a Walksnail VRX module.
Q: Do I need to register the Cetus X HD in the UK?
A: Yes. With a battery, the Cetus X HD weighs roughly 125g and has a camera, which puts it in the 100g-plus bracket that requires an Operator ID from the CAA. You also need a Flyer ID (free online test). The sub-250g weight does mean you can fly in the A1 Open category, closer to uninvolved people.
Q: What radio controller works with the Cetus X HD?
A: The Cetus X HD ships with an ELRS 2.4GHz receiver. Any ELRS 2.4GHz radio works. We recommend the RadioMaster Pocket Crush. Bind it before your first flight.