A stack is the two main electronics boards of a drone bolted together: a flight controller on top (the brain) and a 4-in-1 ESC underneath (the muscle), joined by one 8-pin cable. Darkmatter® stacks pair a Brahma flight controller with a Vishnu ESC on the standard 30.5 × 30.5 mm mounting pattern.

The flight controller reads its gyroscopes and your radio and decides how fast each motor should spin. The ESC (electronic speed controller) takes battery power and drives the motors at those speeds. You need both. A 4-in-1 ESC such as the Vishnu drives four motors from one board.

Choose the flight controller by what you need to connect. Brahma F4: 4 UARTs and 8 motor outputs, for freestyle, cinematic and everyday builds. Brahma F7: 6 UARTs and an HD video plug port, for high-performance FPV. Brahma H7: 7 UARTs, CAN, dual gyroscopes and up to 10 motors, for long-range, heavy-lift and autonomous builds. Then choose the ESC by current: Vishnu 50 (50A continuous per motor) or Vishnu 60 (60A continuous per motor).

Brahma H7 runs Betaflight, INAV, ArduPilot and PX4. Brahma F4 runs Betaflight, INAV and ArduPilot. Brahma F7 runs Betaflight and INAV. The user manual on each product page has step-by-step flashing guides.

Brahma F4 and F7 have eight motor outputs. Brahma H7 has ten, plus two servo outputs. One Vishnu ESC drives four motors, so a hexacopter or octocopter needs a second Vishnu on the flight controller’s other motor outputs, or single ESCs.

The Vishnu 50 and the Vishnu 60 both take a 2–6S battery. Solder the supplied low-ESR capacitor across the battery pads as shown in the manual. For any motor, check its maximum current draw against the ESC rating before you fly.

For a stable ArduPilot build that is easy to tune, we recommend a 4S battery on builds up to 7 inch, and 6S from 10 inch upwards. Our ArduPilot build guide takes a 10 inch build from flashing to a stable GPS Loiter, step by step.

For 10 inch builds and larger we recommend the Vishnu 60. For 6S racing builds the Vishnu 50 is a good choice, and the Vishnu 60 is outstanding. The build guide shows a Vishnu 60 wired and set up on a 10 inch frame.

Every Brahma and Vishnu uses the standard 30.5 × 30.5 mm mounting pattern with 4 mm holes, used by most 5-inch and larger frames. Stacks come with soft TPE grommets, which we injection-mould ourselves, to keep frame vibration out of the gyroscopes.

Yes. Brahma H7 and F7 have a plug-and-play digital VTX port, and Brahma F4 has pads for direct soldering. Brahma H7 can also switch its 9V supply on and off from the radio, so the VTX stays off until the GPS has a fix.

Yes. Brahma F4 and H7 running ArduPilot can talk to a Raspberry Pi or similar computer over a UART using MAVLink. The user manual shows the wiring and the settings.

A Stack H760 includes the Brahma H7, the Vishnu 60, two 8-pin connector cables, eight grommets, a 1000 µF low-ESR capacitor, an XT60 battery connector, 12 AWG battery wire, four M3 25 mm screws with nuts, and a tin box. Each product’s manual lists its own contents.

Darkmatter® flight controllers, ESCs and stacks carry a 6-month warranty against manufacturing defects from the date of purchase. Keep your invoice. Physical damage, water damage and boards burnt by wrong wiring or overloading are not covered; the full terms are in each product’s manual.

They are designed in India and assembled on our own SMT lines in Bally, West Bengal. Every board is programmed and tested, then run on motors at full throttle before it ships.

Message us on WhatsApp at +91 80171 93277. We give build support when you are using our flight controller, ESC and receiver, for builds from 3.5 inch to 15 inch.