2–3 inch toothpick motor
HappyModel EX1204
A 5.9 g, 12 × 4 mm motor for 2S–4S toothpicks, with a stepped 2 mm/1.5 mm shaft and up to 227.6 g of thrust on HappyModel's 14.8 V bench (5000KV, Gemfan 3025).
- Toothpick and twig builds
- 2S–4S (5000KV) or 2S–3S (6500KV)
- 3-inch props (Gemfan 3025 on HappyModel's bench)
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1204 motor drawn from HappyModel’s published sizes, not its exact design. No-load speed is KV × 14.8 V, a nominal pack for this version. HappyModel’s bench tables for it step by thrust rather than throttle, so they are in the bench data below, not on this readout.
- Weight
- 5.9 g
What you get
Bench data for each KV
227.6 g at 7 A on 14.8 V (5000KV) and 208.2 g at 8 A on 11.1 V (6500KV), both with a Gemfan 3025 two-blade prop.
Source: HappyModel product page
Stepped shaft
2 mm inside the motor, 1.5 mm where the prop goes.
Source: HappyModel product page
Two KVs
5000KV for 2S–4S, 6500KV for 2S–3S.
Source: HappyModel product page
5.9 g
HappyModel lists 5.9 g per motor.
Source: HappyModel product page
What to pair it with
Our reading of HappyModel’s numbers, so your build matches what the motor was tested with.
- ESC
- HappyModel's bench tops out at 8 A (6500KV on 11.1 V) and 7 A (5000KV on 14.8 V) with a Gemfan 3025. An ESC rated 10 A or more per motor covers each, if it takes that version's battery. (HappyModel product page)
- Props
- HappyModel tested both KVs with a Gemfan 3025 (76 mm) two-blade prop. (HappyModel product page)
- Battery
- 2S–4S for 5000KV, 2S–3S for 6500KV. (HappyModel product page)
- Frame
- Four M2 screws on a 9 mm circle. (HappyModel drawing)
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 5,000 rpm/V (also 6500KV) | HappyModel product page |
| Stator | 12 × 4 mm (1204) | HappyModel product page |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | HappyModel product page |
| Battery | 2S–4S LiPo (5000KV) (6500KV: 2S–3S) | HappyModel product page |
| Weight | 5.9 g | HappyModel product page |
| Dimensions | φ15 × 16.2 mm (with shaft); 11 mm from the base to the top of the bell | HappyModel drawing |
| Shaft | 1.5 mm outside the motor, 2 mm inside (protrudes 4 mm above the bell, per HappyModel's drawing) | HappyModel product page |
| Mounting | 4 × M2 holes on a 9 mm circle | HappyModel drawing |
| No-load current | 0.19 A (5000KV at 2 V (9740 rpm); 6500KV: 0.27 A at 2 V (11960 rpm)) | HappyModel product page |
| Peak current (bench) | 7 A (where HappyModel's 5000KV bench tops out: Gemfan 3025 two-blade at 14.8 V) | HappyModel product page |
| Max power (bench) | 103.6 W (same row as the peak current) | HappyModel product page |
| Leads | 3 leads, 60 ± 2 mm, with a 3-pin plug | HappyModel drawing |
Bench data
Redrawn from HappyModel’s test reports. Thrust is static pull on a bench, more than you get in flight. Power is volts × amps; efficiency is thrust divided by power.
5000KV on 2S–4S, 14.8 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 3025 (76 mm, 2-blade) | 1 | 57 | 14.8 | 3.851 | |
| 2 | 97.3 | 29.6 | 3.287 | ||
| 3 | 133.1 | 44.4 | 2.998 | ||
| 4 | 162 | 59.2 | 2.736 | ||
| 5 | 187.6 | 74 | 2.535 | ||
| 6 | 210.5 | 88.8 | 2.37 | ||
| 7 | 227.6 | 103.6 | 2.197 |
Source: HappyModel product page
6500KV on 2S–3S, 11.1 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 3025 (76 mm, 2-blade) | 1 | 43.6 | 11.1 | 3.928 | |
| 2 | 76.2 | 22.2 | 3.432 | ||
| 3 | 105.8 | 33.3 | 3.177 | ||
| 4 | 133.6 | 44.4 | 3.009 | ||
| 5 | 153.1 | 55.5 | 2.759 | ||
| 6 | 174.9 | 66.6 | 2.626 | ||
| 7 | 193.2 | 77.7 | 2.486 | ||
| 8 | 208.2 | 88.8 | 2.345 |
Source: HappyModel 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. The top has 11 windows and four M2 holes on a 5 mm circle round the shaft; the bell is 7.5 mm tall. (HappyModel drawing)
- Base. Four M2 holes on a 9 mm circle; the three leads run 60 mm to a 3-pin plug. (HappyModel drawing)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 5000KV 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 | 74,000 | 7,400 Hz | 44,400 |
| 4S full | 16.8 | 84,000 | 8,400 Hz | 50,400 |
| 6S nominal | 22.2 | 111,000 | 11,100 Hz | 66,600 |
| 6S full | 25.2 | 126,000 | 12,600 Hz | 75,600 |
A 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.
About the 3D model
A generic outrunner drawn from HappyModel’s published sizes: the 12 × 4 mm stator, 15 mm bell, 11 mm height, 1.5 mm shaft, 9 mm mounting circle and 9 teeth and 12 magnets. Anything HappyModel 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
- HappyModel: EX1204 KV5000 KV6500 2-4S brushless motor for toothpick or twig FPV drone building (product page, spec list and bench data; the tables' throttle column, in unstated units from 1347 to 2200, is left out). Retrieved Oct 19, 2026.
- HappyModel: EX1204 dimension drawing (image on the product page). Retrieved Oct 19, 2026.
- HappyModel: EX1204 main product photo, used for finish. Retrieved Oct 19, 2026.
