Q: Three BECs, One Board: Why the Kakute H743 Wing Makes Sense

Quick Answer

The Holybro Kakute H743 Wing is the fixed-wing controller we would choose when one compact installation needs servo power, video power and navigation ports without a pile of external regulators. Its separate power board provides three useful BEC rails, while ArduPilot exposes up to 14 PWM outputs. Choose the lighter Matek H7A3-SLIM when space and weight matter more than integrated power distribution.

Three BECs, One Board: Why This Layout Works

A normal multirotor flight controller can run a wing, but it often leaves the builder adding a servo BEC, a filtered VTX regulator and a current sensor. The Holybro Kakute H743 Wing Flight Controller puts those jobs on a stacked power board: 5V at 2A for avionics, an adjustable servo rail rated at 6A continuous, and switchable 9V/12V at 2A for video equipment. That is the feature that matters, not the H7 badge.

The main board uses a 480MHz STM32H743 with 1MB RAM and 2MB flash, an ICM-42688-P IMU, BMP280 barometer, analogue OSD and microSD logging. Seven hardware UARTs, CAN and two I2C connections leave sensible routes for GPS, telemetry, airspeed and compass hardware. The remote USB-C board is also more useful than it sounds: the socket and boot button can remain accessible after the controller disappears inside a foam fuselage.

Do Not Confuse Connector Count with Output Count

Holybro documents 14 PWM outputs, but those outputs share timer groups, so a motor protocol change can affect another output in the same group. Map motors and servos before soldering, then check the current ArduPilot output table and follow our ArduPilot flight-controller setup rather than assigning channels as you go.

The power board accepts 10-36V input, equivalent to 3S-8S LiPo, and includes onboard voltage and current measurement. We would still size the servo rail from the servos' stall current, not their normal moving current. Six amps is generous for a compact wing, but it is not permission to load a large VTOL with power-hungry servos without doing the calculation.

Kakute H743 Wing or Matek H7A3-SLIM?

The Matek H7A3-SLIM remains our pick for a tight, weight-sensitive airframe where the builder already has power distribution sorted. The Kakute makes more sense for a clean all-in-one wing or VTOL installation. If you were replacing Matek's retired H743 board, read our H743-SLIM versus H7A3-SLIM explanation before assuming faster clock speed automatically means the better build.

What We Would Actually Buy

For a survey wing, larger foam aircraft or compact VTOL, we would pay the weight penalty for the Kakute's integrated current sensing, three power rails, dual camera switching and VTX pit switch. For a small cruiser, the 7g Matek is easier to justify. Browse our verified flight controllers and electronics by installation needs first; firmware support comes second, because both boards support current ArduPilot releases.

FAQ

Q: Does the Kakute H743 Wing support INAV and ArduPilot?

A: Yes. Holybro lists support from INAV 6.1.1 and ArduPilot 4.4. Use the KAKUTEH7-Wing target and check the current firmware documentation before flashing.

Q: Can it power high-voltage servos directly?

A: The dedicated servo rail is adjustable and rated at 6A continuous. Confirm the selected rail voltage and total stall current for every servo before connecting them.

Q: Is it a better choice than a Pixhawk?

A: It is smaller and integrates useful wing power features, but it does not offer the same enclosure, connector format or sensor redundancy as larger Pixhawk-class autopilots. Pick by airframe risk and integration needs, not processor alone.