3-inch ducted whoop, 4-inch and light 5-inch FPV motor
BetaFPV 2204
A 21 g 2204 at 2400KV for 4S 3-inch ducted whoops, 4-inch quads and light 5-inch toothpicks; BetaFPV recommends it for its X-Knight 4 and TWIG Mutant 4.
- 3-inch ducted whoops, 4-inch quads and light 5-inch toothpicks
- 4S (rated 4–6S)
- HQ 5025 or Gemfan 5125 three-blade and Gemfan 5020 props on 1.5 mm shafts
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2204 motor drawn from BetaFPV’s published sizes, not its exact design. No-load speed is KV × 14.8 V, a nominal pack for this version. BetaFPV publishes no bench data for it.
- Weight
- 21 g
Plain links: we earn nothing from them.
What you get
Built on the 2004
BetaFPV describes it as an enhanced version of its 2004 motor, giving more torque and delivering it more smoothly.
Source: BetaFPV product page
21 g
21 g with 22 AWG leads.
Source: BetaFPV product page
For 4-inch toothpicks
BetaFPV recommends it for its X-Knight 4 and TWIG Mutant 4, and names its TWIG ET5 5-inch toothpick frame.
Source: BetaFPV product page
What to pair it with
Our reading of BetaFPV’s numbers, so your build matches what the motor was tested with.
- ESC
- BetaFPV recommends its 35A AIO brushless flight controller. (BetaFPV product page)
- Props
- HQ 5025 or Gemfan 5125 three-blade props, or Gemfan 5020 props, on 1.5 mm shafts. (BetaFPV product page)
- Battery
- 4S; BetaFPV suggests its 450 mAh and 850 mAh 4S packs. (BetaFPV product page)
- Frame
- 4–5 inch frames such as BetaFPV's TWIG ET5; M2 screws on a 12 mm circle. (BetaFPV product page)
Where to buy
- BETAFPVthe maker's store; 1 motor; sold out and tagged discontinued when checked$18.49seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 2,400 rpm/V | BetaFPV product page |
| Stator | 22 × 4 mm (2204) (from the size in BetaFPV's name) | BetaFPV product page |
| Battery | 4S–6S LiPo (BetaFPV calls it a 4S motor and suggests 4S packs) | BetaFPV product page |
| Weight | 21 g | BetaFPV product page |
| Dimensions | φ28.6 mm; body 15.1 mm tall, with 3.8 mm of shaft above it (BetaFPV's spec list gives 24.6 × 24.6 × 17.2 mm, the figures on its 2004 page (see modelNotes)) | BetaFPV dimension photo |
| Shaft | 1.5 mm, protrudes 3.8 mm | BetaFPV product page, BetaFPV dimension photo |
| Mounting | M2 holes on a 12 mm circle | BetaFPV product page |
| Leads | 22 AWG, 105 mm (the dimension photo marks 90 mm from the edge of the bell) | BetaFPV product page |
| In the box | 1 motor, a pack of M2 screws | BetaFPV product page |
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Bell. Black, with red-anodised windows in the top; BetaFPV likens the top to car wheels. (BetaFPV product page, BetaFPV top-view photo)
- Shaft. 1.5 mm, standing 3.8 mm above the bell. (BetaFPV product page, BetaFPV dimension photo)
- Leads. 22 AWG wires, 105 mm long. (BetaFPV product page)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2400KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.
| Battery | Volts | No-load rpm (KV × V) | Electrical frequency | ESC steps per second |
|---|---|---|---|---|
| 4S nominal | 14.8 | 35,520 | 4,144 Hz | 24,864 |
| 4S full | 16.8 | 40,320 | 4,704 Hz | 28,224 |
| 6S nominal | 22.2 | 53,280 | 6,216 Hz | 37,296 |
| 6S full | 25.2 | 60,480 | 7,056 Hz | 42,336 |
A 14-pole rotor has 7 pole pairs, so every turn of the shaft is 7 electrical cycles, and a six-step ESC switches the phases 42 times per turn.
About the 3D model
A generic outrunner drawn from BetaFPV’s published sizes: the 22 × 4 mm stator, 28.6 mm bell, 15.1 mm height, 1.5 mm shaft and 12 mm mounting circle. Anything BetaFPV doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.
Sources
- BETAFPV: 2204 Brushless Motors (product page on BetaFPV's own store, tagged discontinued). Retrieved Oct 19, 2026.
- BETAFPV: 2204 2400KV dimension photo: 28.6 mm across, 15.1 mm body, 3.8 mm of 1.5 mm shaft, 90 mm of lead beyond the bell (image on the product page). Retrieved Oct 19, 2026.
- BETAFPV: 2204 main product photo (four side views), used for finish. Retrieved Oct 19, 2026.
- BETAFPV: 2204 product photo (top view), used for the top colour and spoke count. Retrieved Oct 19, 2026.
