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AVIATION / Propulsion / REVIEWED 2026-09-11

B03Four-in-one motor controller

Switch battery power into three-phase motor drive.

Manufacturers & products

An electronic speed controller switches battery power into three motor phases. Four-in-one boards combine four channels; single-channel aircraft ESCs illustrate a different integration architecture.

American sourcing options appear first. A U.S. company or distributor label does not establish U.S. manufacturing. The origin notes identify the specific evidence and any limits.

manufacturer

Unusual Machines / Rotor Riot

Brave 55A 4-in-1 AM32

Four motor channels with AM32 firmware, current sensing and a published U.S. manufacturing statement. [1]

U.S. manufacturing claim

The product-specific data sheet states USA engineering and manufacture. Individual semiconductor, connector and raw-material origins are not disclosed. [1]

Program / application

Direct five-inch-class 4-in-1 candidate; check mounting [1]

Published manufacturing site: United States

Manufacturer inquiry

Public product catalog; confirm the selected variant and current fulfillment directly. No stock or delivery promise is made.

View product & inquiry route
manufacturer

Castle Creations

Talon 35

Single-channel aircraft/heli controller with integral BEC; useful as a U.S. manufacturing reference outside the normal FPV stack. [3]

U.S. manufacturing claim

The Talon 35 page explicitly states circuit-board manufacture and controller assembly in Olathe, Kansas. This does not establish domestic origin of all components. [3]

Program / application

Other aircraft/heli architecture; not a direct 4-in-1 replacement [3]

Published manufacturing site: Olathe, Kansas, USA

Online catalog / ordering

Public product catalog; confirm the selected variant and current fulfillment directly. No stock or delivery promise is made.

View catalog & ordering
manufacturer

Holybro

Tekko32 F4 Metal 65A AM32

Metal-cased MOSFET four-in-one board with AM32 firmware, current sensing and telemetry. [2]

U.S. connection unverified

No product-specific manufacturing-country statement was established from the consulted manufacturer material. [2]

Program / application

Direct five-inch-class 4S–6S candidate [2]

Online catalog / ordering

Public product catalog; confirm the selected variant and current fulfillment directly. No stock or delivery promise is made.

View catalog & ordering

What remains unverified

  • No common test fixture or current-rating standard is established across these three vendors.

Where it comes from

A company address is shown separately from a published factory location. Request the manufacturing site and lot traceability for the exact part when sourcing.

What to compare

  • Battery voltage

    Compare fully charged pack voltage, input limit and transient handling.

  • Continuous versus burst current

    Keep duration, airflow and temperature conditions attached to the rating.

  • Channel architecture

    Four-in-one and individual ESCs require different power and mechanical layouts.

  • Command protocol

    Confirm the controller and ESC share a supported protocol and firmware revision.

  • Mounting and envelope

    Check holes, grommets, board outline, capacitor and connector clearance.

  • Thermal path

    Heat sinking and airflow affect the usable current more than the headline number.

  • Telemetry and sensing

    Distinguish motor telemetry, aggregate current sensing and available firmware support.

  • BEC and filtering

    Do not assume a motor ESC includes regulated power for the camera or flight controller.

Selection & integration notes
  • Brave’s sheet lists 30×30 mm mounting; Holybro lists 30.5×30.5 mm. Confirm fit rather than silently treating these dimensions as identical.
  • Talon 35 is an aircraft/heli alternative with a different integration concept; this catalog does not establish Betaflight/DShot compatibility.

Published product examples

3 REFERENCES

Specifications belong to the named product and configuration.

Brave 55A AM32Unusual Machines / Rotor Riot
Input
10–35 V; marketed 3S–8S[1]Published sheet; do not substitute nominal battery voltage for the input limit.
Current
55 A continuous / 75 A burst[1]Per ESC product rating; burst duration and airflow conditions not published.
Protocols
DShot150/300/600/1200[1]AM32 data sheet.
Size / board mass
46×41×7 mm / 18 g[1]Package weight is separate.
Mounting
30×30 mm[1]As printed in the data sheet.
Example sources [1]
Talon 35Castle Creations
Input
2S–6S LiPo[3]Current product technical table.
Rated current
35 A[3]Full throttle for one 4000 mAh pack, 5 mph airflow at 25°C or cooler; controller below 100°C.
BEC
5.5 V; 5 A continuous / 7 A peak[3]Integral BEC; peak duration not normalized.
Mass
27.8 g wired / 12 g bare[3]Single controller.
Example sources [3]
Tekko32 F4 Metal 65A AM32Holybro
Current
65 A×4 continuous / 75 A×4 burst[2]Manufacturer requires airflow; burst duration not stated.
Input
4S–6S[2]Current AM32 listing, not an older BLHeli32 variant.
Mount
30.5×30.5 mm, M4 holes[2]M3 grommets included.
Size / mass
43×44 mm / 15.8 g[2]Board specification.
BEC
None[2]Requires a separate suitable regulated rail.
Example sources [2]

Sources & references

REVIEWED 2026-09-11

Manufacturer pages and technical documents support the linked claims. A review date is not a publication date or stock check.

  1. Brave 55A 4-in-1 ESC data sheet Unusual Machines / Rotor Riot · Publication date not stated

    USA manufacturing statement; voltage, current, protocols, dimensions and included harnesses.

    Accessed 2026-09-10
  2. Tekko32 F4 Metal 65A 4-in-1 ESC AM32 Holybro · Publication date not stated

    Current AM32 product revision, electrical limits, mounting and included capacitor.

    Accessed 2026-09-10
  3. Talon 35 ESC Castle Creations · Publication date not stated

    Olathe PCB manufacturing and assembly claim; single aircraft/heli ESC electrical limits.

    Accessed 2026-09-11