Drone motors

Four propulsion motors.
Tiny-whoop to cargo class.

Every BU-series motor is wound on a Gwaihir Robotics catalog stator and closed with a Gwaihir rotor extrusion — silicon steel, arc magnets, and enameled copper, assembled and dyno-tested in Virginia.

First articles H1 2027 Engineering samples on request
BU-32 · MICRO 12N14P 32 mm stator lamination cross-section ⌀32 MM STATOR REV A.1
01 — Micro FPV

BU-32

Nano and micro-FPV propulsion for tiny-whoop through cinewhoop builds, where every gram is a design decision.

Stator ⌀
32MM
Winding
4000KV
Mass
28G
Stator stack
Gwaihir AS-32-12 · 12-slot · bonded Si-steel
Rotor shell
Gwaihir RE-32-14 · 14-pole aluminum extrusion
Configuration
12N14P outrunner
Voltage
2–4S LiPo (7.4–16.8 V)
Peak thrust
620 g · 4S · 3.5″ prop
Mounting
12 × 12 mm · M2 · 1.5 mm shaft
Request BU-32 first articles
BU-35 · FPV 12N14P 35 mm stator lamination cross-section ⌀35 MM STATOR REV A.1
02 — FPV / freestyle

BU-35

The 5–7″ FPV and freestyle class — high-kV response for quads that get thrown around, with headroom for sub-250 g builds.

Stator ⌀
35MM
Winding
2550KV
Mass
34G
Stator stack
Gwaihir AS-35-12 · 12-slot · bonded Si-steel
Rotor shell
Gwaihir RE-35-14 · 14-pole aluminum extrusion
Configuration
12N14P outrunner
Voltage
4–6S LiPo (14.8–25.2 V)
Peak thrust
1.9 kg · 6S · 5.1″ prop
Mounting
16 × 16 mm · M3 · M5 prop shaft
Request BU-35 first articles
BU-43 · SUB-1KG 24N22P 43 mm stator lamination cross-section ⌀43 MM STATOR REV A.1
03 — Sub-1 kg / gimbal

BU-43

Two windings on the same 24-slot stator: 900KV for sub-kilogram propulsion, 320KV for ripple-sensitive gimbal and EO/IR platforms.

Stator ⌀
43MM
Windings
900 / 320KV
Mass
96G
Stator stack
Gwaihir AS-43-24 · 24-slot · bonded Si-steel
Rotor shell
Gwaihir RE-43-22 · 22-pole aluminum extrusion
Configuration
24N22P outrunner · low-cogging
Voltage
6–12S (22.2–50.4 V)
Peak thrust
4.2 kg · 12S · 13″ prop (900KV winding)
Mounting
25 × 25 mm · M3 · M6 prop shaft
Request BU-43 first articles
BU-60 · HEAVY LIFT 24N22P 60 mm stator lamination cross-section ⌀60 MM STATOR REV A.1
04 — Heavy lift

BU-60

Cargo, ISR, and last-mile platforms in the 5–25 kg class — low-kV, high-torque propulsion sized for 20″+ props.

Stator ⌀
60MM
Winding
170KV
Mass
385G
Stator stack
Gwaihir AS-60-24 · 24-slot · bonded Si-steel
Rotor shell
Gwaihir RE-60-22 · 22-pole aluminum extrusion
Configuration
24N22P outrunner
Voltage
12–14S (44.4–58.8 V)
Peak thrust
14 kg · 14S · 22″ prop
Mounting
35 × 35 mm · M4 · M8 prop shaft
Request BU-60 first articles
Building robots instead?
QA-series QDD actuators
The 81 mm and 100 mm frame sizes ship as integrated quasi-direct-drive modules — stator, shell, gearing, and encoder in one housing.
QA-81 · QA-100
See actuators