2.5-inch cinewhoop motor
EMAX ECO II 1303.5
EMAX’s factory motor for the Cinehawk Mini: a 1303.5 at 4500KV on a 12 × 12 mm base, spinning 2.5-inch three-blade props in the drone’s ducts.
- EMAX Cinehawk Mini (replacement)
- 2.5-inch cinewhoops with a 12 × 12 mm motor pattern
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1303.5 motor drawn from EMAX’s published sizes, not its exact design. No-load speed is KV × 14.8 V, a nominal pack for this version. EMAX publishes no bench data for it.
from $18.46a motor at EMAX
A set of four: $73.84
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What you get for $18.46
The Cinehawk Mini’s motor
EMAX fits four of these to the Cinehawk Mini, its 2.5-inch ducted cinewhoop on a 108 mm wheelbase, and sells the motor as its spare.
Fits 12 × 12 mm frames
EMAX says the motor also suits other frames with a 12 × 12 mm motor pattern.
Source: EMAX USA product page
13 × 3.5 mm stator
A 13 mm stator, 3.5 mm tall, in an aluminium bell.
Source: EMAX USA product page
What to pair it with
Our reading of EMAX’s numbers, so your build matches what the motor was tested with.
- Props
- On the Cinehawk Mini it spins EMAX’s 2.5-inch Avia three-blades, which EMAX USA lists as the Avia 2515-3 (2.5 × 1.8 × 3). (EMAX Cinehawk Mini page)
- ESC
- On the Cinehawk Mini the motors run from EMAX’s F405 20A ELRS all-in-one board. EMAX publishes no current figures for the motor. (EMAX Cinehawk Mini page)
- Frame
- A 12 × 12 mm hole pattern; EMAX does not give the screw size. (EMAX USA product page)
Where to buy
- EMAX USAthe maker’s US store (listed as sold out)$11.99seen Oct 19, 2026Visit
- EMAXthe maker’s global store, as the ECOII 13035$18.46seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 4,500 rpm/V | EMAX USA product page, EMAX product page |
| Stator | 13 × 3.5 mm (1303.5) | EMAX USA product page |
| Mounting | 12 × 12 mm hole pattern (EMAX gives no screw size) | EMAX USA product page |
| Bell | Aluminium | EMAX USA 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. Aluminium. (EMAX USA product page)
- Stator. The coils are wound on a stack of thin steel laminations: 13 × 3.5 mm (1303.5). (EMAX USA product page)
- Base. 12 × 12 mm hole pattern (EMAX gives no screw size). (EMAX USA product page)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 4500KV 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 | 66,600 | 7,770 Hz | 46,620 |
| 4S full | 16.8 | 75,600 | 8,820 Hz | 52,920 |
| 6S nominal | 22.2 | 99,900 | 11,655 Hz | 69,930 |
| 6S full | 25.2 | 113,400 | 13,230 Hz | 79,380 |
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 EMAX’s published sizes: the 13 × 3.5 mm stator and 12 mm mounting circle. Anything EMAX 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
- EMAX USA: Cinehawk Mini Spare Parts, 1303.5 4500KV Motor (product page). Retrieved Oct 19, 2026.
- EMAX: CineHawk Mini Spare Parts, ECOII 13035 4500KV Brushless Motor (product page on EMAX’s global store, with five photos of the motor). Retrieved Oct 19, 2026.
- EMAX USA: Cinehawk Mini 2.5" BNF with O3 Air Unit (product page; its spec list gives the motors, props, AIO board and wheelbase). Retrieved Oct 19, 2026.