Ultralight tiny whoop motor
Tiny Whoop Firefly 40s 0702
A 40,000KV 702 for ultralight whoop builds: 1.38 g with leads and plug, or 1.23 g with bare magnet-wire leads, on Tiny Whoop's keyed locking shaft.
- Ultralight 702 whoop builds
- Plugless builds, with the magnet-wire version
- A faster Firefly: 40,000KV against the original 36,000KV
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 Tiny Whoop’s published sizes, not its exact design. No-load speed is KV × 3.7 V, a nominal pack for this version. Tiny Whoop publishes no bench data for it.
- Weight
- 1.38 g
- standard version with silicone wires, PCB and plug (1.379675 g in Tiny Whoop's weighing); the magnet-wire version weighs 1.2255875 g before the excess wire is trimmed
from $45.99a motor at Tiny Whoop
A set of four: $183.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What you get for $45.99
Magnet-wire option
The Ultralight version has no plug: magnet wire runs from the windings straight to the flight controller, which Tiny Whoop says saves 0.62 g on a build.
Source: Tiny Whoop product page
Locking shaft
A keyed shaft fits a matching keyhole in the bell, which Tiny Whoop says stops the shaft slipping.
Source: Tiny Whoop product page
Direction on the bell
The curved spokes on the top sweep one way on clockwise motors and the other on counter-clockwise ones.
Source: Tiny Whoop bell drawing
1.38 g
Tiny Whoop weighs it at 1.379675 g with silicone wires, PCB and plug, and 1.2255875 g with magnet wire before trimming.
Source: Tiny Whoop product page
What to pair it with
Our reading of Tiny Whoop’s numbers, so your build matches what the motor was tested with.
- ESC
- The standard version plugs into a whoop board; the Ultralight version is soldered to the flight controller. Tiny Whoop publishes no current draw or bench data. (Tiny Whoop product page)
- Frame
- Tiny Whoop says these were designed for ultralight builds. It sells three-hole plastic risers for Project Topspin 702 and 802 motors, for frames where the props should sit higher in the ducts. (Tiny Whoop product page, Tiny Whoop spacer page)
Where to buy
- Tiny Whoopthe maker's store; set of 4 (2 CW, 2 CCW), either wire style$45.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 40,000 rpm/V (the one KV of the Firefly 40s; Tiny Whoop made it as a faster version of its 36,000KV Firefly) | Tiny Whoop product page |
| Stator | 7 × 2 mm (0702) (size from the 702 in Tiny Whoop's name) | Tiny Whoop product page |
| Weight | 1.38 g (standard version with silicone wires, PCB and plug (1.379675 g in Tiny Whoop's weighing); the magnet-wire version weighs 1.2255875 g before the excess wire is trimmed) | Tiny Whoop product page |
| Shaft | Locking shaft: keyed into a matching keyhole in the bell so it can't slip (the page doesn't give this motor's diameter; Tiny Whoop makes Project Topspin motors with 1.0 or 1.5 mm shafts) | Tiny Whoop product page |
| Mounting | 3 screw holes (from the three-hole spacers Tiny Whoop sells for its Project Topspin 702 and 802 motors; no hole size or spacing is published) | Tiny Whoop spacer page |
| Bell | Curved spokes on the top that show which way the motor turns | Tiny Whoop bell drawing |
| Leads | Two versions: silicone wires on PCB solder pads with plugs, or Ultralight bare magnet wire straight from the windings, with no plug | Tiny Whoop product page |
| In the box | 2 clockwise and 2 counter-clockwise motors, with metal motor screws | Tiny Whoop 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. Keyed into the bell like a key in a lock, Tiny Whoop's "locking shaft". (Tiny Whoop product page)
- Bell. Curved spokes on the top that mark the motor's direction; Tiny Whoop says the lighter bell carries less rotating mass, so thrust rises faster. (Tiny Whoop product page)
- Leads. Silicone wires on PCB solder pads with plugs, or bare magnet wire with no plug. (Tiny Whoop product page)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 40000KV 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 | 592,000 | 59,200 Hz | 355,200 |
| 4S full | 16.8 | 672,000 | 67,200 Hz | 403,200 |
| 6S nominal | 22.2 | 888,000 | 88,800 Hz | 532,800 |
| 6S full | 25.2 | 1,008,000 | 100,800 Hz | 604,800 |
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 Tiny Whoop’s published sizes: the 7 × 2 mm stator. Anything Tiny Whoop 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
- Tiny Whoop: 702 40KKV Firefly 40s - Project Topspin Tiny Whoop Motors (product page on Tiny Whoop's own store). Retrieved Oct 19, 2026.
- Tiny Whoop: Firefly 40s main product photo, standard version with silicone wires and plugs (image on the product page), used for finish. Retrieved Oct 19, 2026.
- Tiny Whoop: close-up photo of one Firefly 40 (image on the product page), used for the colour of the top's edges. Retrieved Oct 19, 2026.
- Tiny Whoop: "Motor bell indicates motor direction" drawing of the Project Topspin bell top, clockwise and counter-clockwise (image on the product page). Retrieved Oct 19, 2026.
- Tiny Whoop: Motor Spacers/Risers for 702 and 802 motors (product page; three-hole plastic spacers made for Project Topspin motors). Retrieved Oct 19, 2026.
