85–120 mm 4S whoop and micro motor
BetaFPV 1106
A 4S motor for 85–120 mm whoops and micro quads: 6.6 g, N48H magnets and a 1.5 mm shaft, sold in 3800KV and 4500KV.
- 85–120 mm 4S whoops and micro quads (Beta85X, Beta95X, HX100)
- 4S
- 2- to 3-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1106 motor drawn from BetaFPV’s published sizes, not its exact design. No-load speed is KV × 14.8 V, a nominal pack for this version. BetaFPV publishes no bench data for it.
- Weight
- 6.6 g
Plain links: we earn nothing from them.
What you get
N48H magnets
Sintered NdFeB N48H high-temperature magnets and Kawasaki silicon-steel laminations, in an aviation-aluminium bell.
Source: BetaFPV product page
Balanced CNC bell
BetaFPV machines the bells on CNC and balances them at the factory.
Source: BetaFPV product page
3800KV on D63 props
BetaFPV pairs the 3800KV with Gemfan D63 five-blade props and says the pair gives strong power with less noise.
Source: BetaFPV product page
What to pair it with
Our reading of BetaFPV’s numbers, so your build matches what the motor was tested with.
- ESC
- BetaFPV pairs it with its Toothpick F4 2-4S AIO (for the HX100) and F4 2-4S AIO brushless flight controllers (for the Beta85X). (BetaFPV product page)
- Props
- By build: 3-inch props on the HX100, EMAX Avan 2-inch on the Beta85X, Gemfan 2540 three-blades on the Beta95X and Gemfan D63 five-blades on the Beta95X V3. (BetaFPV product page)
- Battery
- 4S for both KVs. (BetaFPV product page)
- Frame
- Four M2 screws on a 9 mm circle; BetaFPV names its HX100, Beta85X, Beta95X and Beta95X V3 frames. (BetaFPV product page, BetaFPV drawing)
Where to buy
- BETAFPVthe maker's store; set of 4, $31.99 for either KV; sold out and tagged discontinued when checked$31.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 4,500 rpm/V (also 3800KV) | BetaFPV product page |
| Stator | 11 × 6 mm (1106), Kawasaki silicon-steel laminations (size from BetaFPV's name) | BetaFPV product page |
| Battery | 4S LiPo | BetaFPV product page |
| Weight | 6.6 g | BetaFPV product page |
| Dimensions | φ14.2 mm; 14 mm tall without the shaft | BetaFPV product page, BetaFPV drawing, BetaFPV 4500KV dimension photo |
| Shaft | 1.5 mm, protrudes 2.5 mm | BetaFPV product page, BetaFPV drawing, BetaFPV 4500KV dimension photo |
| Mounting | 4 × M2 holes on a 9 mm circle (BetaFPV's spec list gives 'M2EQS on Dia 5.0mm', which matches the drawing's prop holes on the top (two M2 on a 5 mm circle)) | BetaFPV drawing |
| Bell | aviation aluminium, CNC machined, factory balanced; two M2 prop-mount holes on a 5 mm circle | BetaFPV product page, BetaFPV drawing |
| Magnets | sintered NdFeB, N48H high-temperature grade | BetaFPV product page |
| Leads | 28 AWG, 40 mm, Micro JST 1.25 mm 3-pin plug (the 5000KV drawing shows 55 mm) | BetaFPV product page, BetaFPV 3800KV dimension photo, BetaFPV 4500KV dimension photo |
| In the box | 4 motors | BetaFPV 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. Black anodised aviation aluminium, CNC machined and factory balanced, with six spokes on top and two M2 prop holes on a 5 mm circle. (BetaFPV product page)
- Magnets. Sintered NdFeB, N48H high-temperature grade. (BetaFPV product page)
- Stator. Kawasaki silicon-steel laminations. (BetaFPV product page)
- Shaft. 1.5 mm, standing 2.5 mm above the bell. (BetaFPV product page)
- Base. Four M2 holes on a 9 mm circle. (BetaFPV product page)
- Leads. Three 28 AWG wires, 40 mm long, ending in a Micro JST 1.25 mm three-pin plug. (BetaFPV 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 | 6,660 Hz | 39,960 |
| 4S full | 16.8 | 75,600 | 7,560 Hz | 45,360 |
| 6S nominal | 22.2 | 99,900 | 9,990 Hz | 59,940 |
| 6S full | 25.2 | 113,400 | 11,340 Hz | 68,040 |
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 BetaFPV’s published sizes: the 11 × 6 mm stator, 14.2 mm bell, 14 mm height, 1.5 mm shaft and 9 mm mounting circle. Anything BetaFPV 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
- BETAFPV: 1106 Brushless Motors (product page; sold out and tagged discontinued when read). Retrieved Oct 19, 2026.
- BETAFPV: 1106 outline drawing (image on the product page), labelled 1106 5000KV. Retrieved Oct 19, 2026.
- BETAFPV: 1106 3800KV dimension photo (image on the product page). Retrieved Oct 19, 2026.
- BETAFPV: 1106 4500KV dimension photo (image on the product page). Retrieved Oct 19, 2026.
- BETAFPV: 1106 4500KV main product photo, used for finish. Retrieved Oct 19, 2026.
