Review: iFlight Succex F4 Micro 16x16mm FC/ESC/VTX Stack

Looking for a nano 16x16mm flight controller stack for your next micro quad? Check out the iFlight Succex F4 Micro Stack which has been around long enough to prove itself a reliable option.

It’s a 16x16mm FC stack, which in comparison to a full size (30.5×30.5mm) or even a mini size (20x20mm) stack, it looks ridiculously small! That is great for micro quads in terms of form factor as well as weight saving.

In the box there are:

  • SucceX F4 Micro FC
  • 12A 4in1 ESC
  • (optional) 200mW VTX
  • XT30 battery lead (18AWG, 8cm)
  • Dipole VTX antenna (8cm)
  • FPV Camera cable (10cm)

Over the months, iFlight experimented with different types of bolts, nuts, and soft-mounting material, finally settled with what we see today. The total weight of the stack is only 9.2g including screws and nuts.

The height of the stack including VTX is about 20mm, or 16mm without the VTX board.

There are three boards in this stack, from top to bottom, are the 200mW VTX, F4 FC and a 12A 4in1 ESC. Here is a close up of the top side of every board.

iFlight Succex F4 Micro 16x16mm FC/ESC/VTX Stack Top board

Top Side

And the bottom side:

iFlight Succex F4 Micro 16x16mm FC/ESC/VTX Stack Bottom board

Bottom Side

As you can see the solder pads are quite small and requires good soldering skills.

Not a single wire to be seen in this stack.

The connection between boards are made by tiny header pins, which in my opinion, might be counterproductive in terms of soft-mounting. But it is indeed a very clean solution.

Here are the specifications of each board:

SucceX Micro VTX

  • Selectable Output Power: 25/100/200mW
  • Antenna Connector: IPEX (U.FL)
  • VTX Control: IRC Tramp
  • Size: 17x27mm
  • Mounting holes: 16x16mm
  • Weight: 1.6g

SucceX F4 Flight Controller

  • F4 Processor, MPU6000 Gyro
  • Input voltage 2S – 4S LIPO
  • 2x UART ports
  • 4x motor outputs
  • Betaflight OSD
  • BEC: 5V 2A
  • Size: 21x21mm
  • Mounting holes: 16x16mm
  • Weight: 2.5g
  • BF firmware target : MATEKF411

SucceX Micro 12A Brushless ESC

  • BLHeli_S Firmware (BB21 MCU)
  • Input voltage : 2S – 4S LIPO
  • Continuous Current: 12A
  • ESC protocol: PWM, Oneshot125, Multishot, Dshot600
  • Size: 23x21mm
  • Mounting holes: 16x16mm
  • Weight: 2.7g

Here is the pin-out diagram (wiring diagram) of the iFlight F4 Micro FC Stack.

According to the manual, by bridging the tiny solder pads as shown in the above diagram, bypasses the “built-in” inverter for RX2. You should bridge these pads if you are using “non-inverted” radio protocols such as DSMX and Crossfire. For Frsky SBUS, just leave the pads un-bridged.

There are not enough UART on this board for you to run SmartPort telemetry (only two UART’s available), assuming you are using 1 UART for VTX control (tramp) and the other for SBUS. The only way to get Frsky Telemetry is to run FPort. In CLI, set serialrx_inverted = on, set serialrx_halfduplex=off.

UART1 is reserved for VTX Control (IRC Tramp). It’s not broken out to a solder pad and the only connection is via the head pin connector, so accessing it for something else isn’t going to be easy.

There is a V2 of this micro stack (product page: http://bit.ly/2KwdsKy), but really, the differences are minimal and you can save a few dollars getting the V1. Here is a summary of the differences:

  • Slightly larger 5V BEC (2A vs. 3A) – 2A is enough for the most part unless you are powering an HD camera like the Runcam Split off the FC
  • Blackbox Flash – rarely used
  • Motor Connectors on 4in1 ESC – which I think it’s actually NOT a great idea, direct solder is better for performance

I believe they made the V2 mainly for the Cinewhoop.

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