1S tiny whoop motor
VCI Spark 0702
A 1.52 g motor for 1S whoops; on VCI’s 4 V bench the 27000KV reaches 25.8 g on a GF 35mm-3 at 4 A.
- 1S tiny whoops
- 1S
- 31 and 35 mm Gemfan props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 0702 motor drawn from VCI’s published sizes, not its exact design. No-load speed is KV × 3.7 V, a nominal pack for this version. VCI’s bench tables for it step by thrust rather than throttle, so they are in the bench data below, not on this readout.
- Weight
- 1.52 g
- with its cable; 1.53 g for the 22000KV
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What you get
About 25 g per motor
VCI’s tables top out at 26 g for the 22000KV (GF 35mm-3, 3.3 A) and 25.8 g for the 27000KV (GF 35mm-3, 4 A), at 4 V.
Source: VCI data sheet
Four KVs
VCI lists it in 22000KV, 25000KV, 27000KV and 29000KV, in sets of four.
Source: VCI home page
What to pair it with
Our reading of VCI’s numbers, so your build matches what the motor was tested with.
- ESC
- VCI’s peak currents run from 3.3 A (22000KV) to 4 A (27000KV and 29000KV) at 4 V. (VCI data sheet)
- Props
- VCI tested a 35 mm three-blade and 31 mm two- and three-blade Gemfan props. (VCI data sheet)
- Battery
- 1S; VCI rates it at 1S (4 V). (VCI data sheet)
- Frame
- Three M1.4 screws on a 6.6 mm circle. (VCI drawing)
Where to buy
- WREKDset of 4, choose the KVprice on the store’s pageVisit
- WREKD2-pack, choose the KVprice 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 | 27,000 rpm/V (also 22000KV, 25000KV and 29000KV) | VCI data sheet, VCI home page |
| Stator | 7 × 2 mm (0702) | VCI data sheet |
| Configuration | 9S12P (9 stator slots, 12 magnet poles) | VCI data sheet |
| Battery | 1S (4 V) LiPo | VCI data sheet |
| Weight | 1.52 g (with its cable; 1.53 g for the 22000KV) | VCI data sheet |
| Dimensions | φ9 × 12.2 mm with the shaft, which stands 4.2 mm above the bell | VCI data sheet, VCI drawing |
| Shaft | 1 mm, standing 4.2 mm above the bell | VCI data sheet, VCI drawing |
| Mounting | 3 × M1.4 holes on a 6.6 mm circle | VCI drawing |
| Magnets | N52SH arc magnets | VCI data sheet |
| Internal resistance | 290 mΩ (350 mΩ for the 22000KV, 300 mΩ for the 25000KV, 275 mΩ for the 29000KV) | VCI data sheet |
| Idle current | 0.6 A (at 3 V; 0.4 A for the 22000KV, 0.5 A for the 25000KV, 0.7 A for the 29000KV) | VCI data sheet |
| Peak current | 4 A (3.3 A for the 22000KV, 3.7 A for the 25000KV, 4 A for the 29000KV) | VCI data sheet |
| Max instantaneous power | 16 W (13.2 W for the 22000KV, 14.8 W for the 25000KV, 16 W for the 29000KV) | VCI data sheet |
| Leads | 30 AWG silicone wire, 30 mm | VCI data sheet |
Bench data
Redrawn from VCI’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.
22000KV on 1S, 4 V3 props
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| GF 35mm-3motor at 64 °C | 0.5 | 3.4 | 1.7 | 2 | |
| 1 | 7.1 | 1.78 | 4 | ||
| 1.5 | 10.7 | 1.78 | 6 | ||
| 2 | 15.6 | 1.95 | 8 | ||
| 2.5 | 20.7 | 2.07 | 10 | ||
| 3 | 24.2 | 2.02 | 12 | ||
| 3.3 | 26 | 1.97 | 13.2 | ||
| GF 31mm-2motor at 53 °C | 0.5 | 3 | 1.5 | 2 | |
| 1 | 6.5 | 1.63 | 4 | ||
| 1.5 | 10.4 | 1.73 | 6 | ||
| 2 | 15.2 | 1.9 | 8 | ||
| 2.5 | 20.1 | 2.01 | 10 | ||
| 3 | 24 | 2 | 12 | ||
| GF 31mm-3motor at 60 °C | 0.5 | 2.7 | 1.35 | 2 | |
| 1 | 5.9 | 1.48 | 4 | ||
| 1.5 | 9.6 | 1.6 | 6 | ||
| 2 | 14.8 | 1.85 | 8 | ||
| 2.5 | 19.8 | 1.98 | 10 | ||
| 3 | 23.8 | 1.98 | 12 |
Source: VCI data sheet
25000KV on 1S, 4 V3 props
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| GF 35mm-3motor at 64 °C | 0.5 | 2.9 | 1.45 | 2 | |
| 1 | 5.7 | 1.43 | 4 | ||
| 1.5 | 8.9 | 1.48 | 6 | ||
| 2 | 12.4 | 1.55 | 8 | ||
| 2.5 | 17.2 | 1.72 | 10 | ||
| 3 | 21.2 | 1.77 | 12 | ||
| 3.5 | 24.2 | 1.73 | 14 | ||
| 3.7 | 25.4 | 1.72 | 14.8 | ||
| GF 31mm-2motor at 53 °C | 0.5 | 2.2 | 1.1 | 2 | |
| 1 | 5 | 1.25 | 4 | ||
| 1.5 | 7.5 | 1.25 | 6 | ||
| 2 | 11.5 | 1.44 | 8 | ||
| 2.5 | 16.4 | 1.64 | 10 | ||
| 3 | 20.7 | 1.73 | 12 | ||
| 3.4 | 23.3 | 1.71 | 13.6 | ||
| GF 31mm-3motor at 54 °C | 0.5 | 2.1 | 1.05 | 2 | |
| 1 | 4.8 | 1.2 | 4 | ||
| 1.5 | 7.5 | 1.25 | 6 | ||
| 2 | 11.2 | 1.4 | 8 | ||
| 2.5 | 15.7 | 1.57 | 10 | ||
| 3 | 19.8 | 1.65 | 12 | ||
| 3.5 | 23.1 | 1.65 | 14 |
Source: VCI data sheet
27000KV on 1S, 4 V3 props
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| GF 35mm-3motor at 68 °C | 0.5 | 2.7 | 1.35 | 2 | |
| 1 | 5.3 | 1.33 | 4 | ||
| 1.5 | 7.8 | 1.3 | 6 | ||
| 2 | 11.6 | 1.45 | 8 | ||
| 2.5 | 15.4 | 1.54 | 10 | ||
| 3 | 19.9 | 1.66 | 12 | ||
| 3.5 | 23.4 | 1.67 | 14 | ||
| 4 | 25.8 | 1.61 | 16 | ||
| GF 31mm-2motor at 56 °C | 0.5 | 2.1 | 1.05 | 2 | |
| 1 | 4.6 | 1.15 | 4 | ||
| 1.5 | 7.1 | 1.18 | 6 | ||
| 2 | 10.8 | 1.35 | 8 | ||
| 2.5 | 15.9 | 1.59 | 10 | ||
| 3 | 23.6 | 1.97 | 12 | ||
| 3.7 | 24.8 | 1.68 | 14.8 | ||
| GF 31mm-3motor at 59 °C | 0.5 | 2.2 | 1.1 | 2 | |
| 1 | 4.4 | 1.1 | 4 | ||
| 1.5 | 6.9 | 1.15 | 6 | ||
| 2 | 10.2 | 1.28 | 8 | ||
| 2.5 | 14.7 | 1.47 | 10 | ||
| 3 | 22.1 | 1.84 | 12 | ||
| 3.7 | 23.9 | 1.61 | 14.8 |
Source: VCI data sheet
29000KV on 1S, 4 V3 props
| Prop | Step | Current (A) | Thrust (g) | Efficiency (g/W) | Power (W) |
|---|---|---|---|---|---|
| GF 35mm-3motor at 68 °C | 0.5 | 2.5 | 1.25 | 2 | |
| 1 | 5.2 | 1.3 | 4 | ||
| 1.5 | 7.3 | 1.22 | 6 | ||
| 2 | 10.6 | 1.33 | 8 | ||
| 2.5 | 14 | 1.4 | 10 | ||
| 3 | 18.5 | 1.54 | 12 | ||
| 3.5 | 22.2 | 1.59 | 14 | ||
| 4 | 24.8 | 1.55 | 16 | ||
| GF 31mm-2motor at 57 °C | 0.5 | 1.8 | 0.9 | 2 | |
| 1 | 4 | 1 | 4 | ||
| 1.5 | 6.2 | 1.03 | 6 | ||
| 2 | 9.7 | 1.21 | 8 | ||
| 2.5 | 14.2 | 1.42 | 10 | ||
| 3 | 19.1 | 1.59 | 12 | ||
| 3.8 | 23.6 | 1.55 | 15.2 | ||
| GF 31mm-3motor at 58 °C | 0.5 | 2.1 | 1.05 | 2 | |
| 1 | 4.1 | 1.03 | 4 | ||
| 1.5 | 6.3 | 1.05 | 6 | ||
| 2 | 9.5 | 1.19 | 8 | ||
| 2.5 | 13.7 | 1.37 | 10 | ||
| 3 | 17.7 | 1.48 | 12 | ||
| 3.9 | 22.9 | 1.47 | 15.6 |
Source: VCI data sheet
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Magnets. N52SH arc magnets. (VCI data sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 27000KV 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 | 399,600 | 39,960 Hz | 239,760 |
| 4S full | 16.8 | 453,600 | 45,360 Hz | 272,160 |
| 6S nominal | 22.2 | 599,400 | 59,940 Hz | 359,640 |
| 6S full | 25.2 | 680,400 | 68,040 Hz | 408,240 |
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 VCI’s published sizes: the 7 × 2 mm stator, 9 mm bell, 8 mm height, 1 mm shaft, 6.6 mm mounting circle and 9 teeth and 12 magnets. Anything VCI 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
- VCI Hobby: home page. Its “VCI Micro Whoop Series” link goes to the VCI SPARK 0702 MOTOR, 22000KV/25000KV/27000KV/29000KV (4 pcs), whose product page has been removed; VCI’s mobile home page still shows the motor under that name.. Retrieved Oct 19, 2026.
- VCI: Spark 0702 drawing (VCI’s own drawing, as an image on WREKD’s product page; VCI’s site no longer has a page for this motor). Retrieved Oct 19, 2026.
- VCI: Spark 0702 data sheet, specs and testing data for the 22000KV, 25000KV, 27000KV and 29000KV at 4 V on three Gemfan props (VCI’s own sheet, as an image on WREKD’s product page). Rows step by current, 0.5 A apart, up to each prop’s highest reading; VCI’s temperature is the shaft’s after a run from 0 to 100% throttle; its voltage column, 4 V on every row, is left out.. Retrieved Oct 19, 2026.
- VCI Hobby: Spark 0702 29000KV product photo (on VCI’s mobile home page). Retrieved Oct 19, 2026.
