1S tiny whoop motor
HappyModel EX1002
A 2.45 g motor on a 10 × 2 mm stator with a 1.5 mm shaft, for the 1S versions of HappyModel's Mobula7 and Moblite7; 55.4 g of thrust per motor on HappyModel's 3.7 V bench with a Gemfan 2015 two-blade.
- Mobula7 and Mobula7 HD, 1S versions
- Moblite7 HDZero and Moblite7 Avatar
- 1S only
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1002 motor drawn from HappyModel’s published sizes, not its exact design. No-load speed is KV × 3.7 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
- 2.45 g
Plain links: we earn nothing from them.
What you get
55.4 g on 1S
HappyModel's bench: 55.4 g at 5.99 A on 3.7 V with a Gemfan 2015-2 two-blade prop.
Source: HappyModel product page
2.45 g
HappyModel lists 2.45 g per motor.
Source: HappyModel product page
For 1S Mobula7 and Moblite7
HappyModel lists it for the Mobula7 and Mobula7 HD 1S versions, the Moblite7 HDZero and the Moblite7 Avatar.
Source: HappyModel product page
1.5 mm shaft
1.5 mm, standing 3.5 mm above the bell.
Source: HappyModel drawing
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 5.99 A per motor (3.7 V, Gemfan 2015-2). A 1S whoop board rated above 6 A per motor covers it. (HappyModel product page)
- Props
- HappyModel tested it with the Gemfan 2015-2 two-blade. (HappyModel product page)
- Battery
- 1S LiPo only. (HappyModel product page)
- Frame
- Three M1.4 screws on a 6.6 mm circle; a JST 1.25 mm plug on 40 mm leads. (HappyModel product page, HappyModel drawing)
Where to buy
- RaceDayQuads20000KV, choose versionprice on the store’s pageVisit
- WREKD20000KV, choose versionprice on the store’s pageVisit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 20,000 rpm/V | HappyModel product page |
| Stator | 10 × 2 mm (1002) | HappyModel product page |
| Configuration | 9N12P (9 stator slots, 12 magnet poles) | HappyModel product page |
| Battery | 1S LiPo only | HappyModel product page |
| Weight | 2.45 g | HappyModel product page |
| Dimensions | Φ13.5 × 12.5 mm (with shaft) (HappyModel's drawing gives the bell as φ13.56 mm and 7.8 mm from the base to the top of the bell) | HappyModel product page |
| Shaft | 1.5 mm, protrudes 3.5 mm above the bell | HappyModel drawing |
| Mounting | 3 × M1.4 holes on a 6.6 mm circle | HappyModel drawing |
| No-load current | 0.5 A (at 2 V) | HappyModel product page |
| Peak current (bench) | 5.99 A (where HappyModel's bench tops out: Gemfan 2015-2 two-blade prop at 3.7 V) | HappyModel product page |
| Max power (bench) | 22.163 W (same row as the peak current) | HappyModel product page |
| Leads | 3 leads, 40 mm without the plug, ending in a JST 1.25 mm plug | HappyModel product page |
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.
20000KV on 1S, 3.7 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| Gemfan 2015-2 (2-blade) | 1.01 | 12.9 | 3.452 | 3.737 | |
| 2.01 | 23.3 | 3.133 | 7.437 | ||
| 3 | 32.1 | 2.892 | 11.1 | ||
| 4 | 40.8 | 2.757 | 14.8 | ||
| 5 | 48.9 | 2.643 | 18.5 | ||
| 5.99 | 55.4 | 2.5 | 22.163 |
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:
- Shaft. 1.5 mm, protrudes 3.5 mm above the bell. (HappyModel drawing)
- Stator. The coils are wound on a stack of thin steel laminations: 10 × 2 mm (1002). (HappyModel product page)
- Base. 3 × M1.4 holes on a 6.6 mm circle. (HappyModel drawing)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 20000KV 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 | 296,000 | 29,600 Hz | 177,600 |
| 4S full | 16.8 | 336,000 | 33,600 Hz | 201,600 |
| 6S nominal | 22.2 | 444,000 | 44,400 Hz | 266,400 |
| 6S full | 25.2 | 504,000 | 50,400 Hz | 302,400 |
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 10 × 2 mm stator, 13.56 mm bell, 7.8 mm height, 1.5 mm shaft, 6.6 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: EX1002 KV20000 new series brushless motor for Mobula7 1S (product page, spec list and bench data). Retrieved Oct 19, 2026.
- HappyModel: EX1002 KV20000 dimension drawing (image on the product page). Retrieved Oct 19, 2026.
- HappyModel: EX1002 main product photo, used for finish. Retrieved Oct 19, 2026.
