TrePex [with tips!]

By percisely on Feb 12, 2021

14  359  5

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Alt Tag This was supposed to be a parts build, using spare motors and electronics I already had to add a third Apex to my fleet. Then BrainFPV dropped the Radix 2. It didn't feel right setting that up with banged up motors, so I ordered one of the NewBeeDrone Flow Motor 8-packs and got to work...slowly.


The Radix 2 allowed me to simplify the wiring and divide the build into independently removable 'layers'.
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Weight with no battery or GoPro 439G
Weight with 1000MaH Ovonic LiPo and GoPro H7 731G
Solder Joints 87
HD Angle 20º
FPV FoV 170º
Favorite Color Red

Build Tips

Nothing fancy.

Bottom Buzzer Button

Alt TagIf you're not running the Apex OSD you can use the little 'nook' behind the camera for a battery powered buzzer.

Alt Tag The JHE20B Quad Finder buzzer's button lines up well with the cutout in the frame.

Short and Secure 10 Pin Connector

Alt Tag BrainFPV and HobbyWing include connectors with their boards, but I find them to be unnecessarily long. Tiny's LEDs has a 35mm kit which cleans thing up a bit.

Alt Tag To prevent damage and grime, cover the connector with some tape. I used to loathe JST-SH, but since I started doing this I haven't had any connector issues.

Use HD Camera Plates for Micro Analog Cameras

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If you want to run a micro form factor camera I recommend picking up the HD Camera Plates for the easiest fit. Stubby mini form factor cameras, such as the Foxeer Toothless also fit better with the HD plates. The TPU spacer included with the plates didn't work very well for micro so I just used some plastic washers and o-rings.

Conformal Coat

Alt Tag Yes.


Also yes. Alt Text

Betaflight Settings

diff here

Thanks for checking out my build! See it fly on Instagram or YouTube.

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A note on the pricing below - RotorBuilds is doing something funky with the currency conversion of the ImpulseRC links, making them artificially high in USD.


Part List


Apex FPV Frame
See Site

Flight Controller

RADIX 2 Flight Controller - brainfpv (3 builds)


HobbyWing XROTOR 4IN1 ESC FOR FPV RACING - MICRO 60A BLHELI32 DSHOT1200 (3-6S) (9 builds)


4 x NewBeeDrone FLOW 2306.5 Racing and Freestyle FPV Motor 1850KV (8 builds)


HQ Prop Ethix S5 Light Grey (2CW+2CCW)-Poly Carbonate (5 builds)

FPV Camera

RunCam Micro Eagle (313 builds)

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 V1.1 (302 builds)


TBS Crossfire Nano RX Special Edition FPV LONG RANGE DRONE RECEIVER (52 builds)

3D Printed

ImpulseRC APEX GoPro Mount 20/25/30° (Session / Hero 5/6/7) by ps915
See Site

Misc Parts

Apex Plastics Kit - RED

Misc Parts

Apex Race Wire - RED - (4 Pack)

Misc Parts

JHE20B Quad Finder LED Buzzer Beacon w/ Internal Battery (3 builds)

Misc Parts

2 x Femto 16

Misc Parts

WaFL’s Cap Cap (Set of 5) (3 builds)

Misc Parts

5v LED Silicone Cable Kit (4x 35mm / 4x 70mm)

Misc Parts

ESC Cable Kit 35mm

Misc Parts

M3 Anodized Locknut (5Pcs.) - Choose Color

Misc Parts

RunCam RC25G FPV Lens 2.5mm FOV140 Wide Angle for Swift Series, Eagle 4:3 Series, Split 1/2 (2 builds)

Misc Parts

Apex HD Camera Side Plate KIT

Misc Parts

Machined Aluminum Prop Washer (5 pcs.) (4 builds)

Misc Parts

5 volt FC Addressable LED PDB (2 builds)

Misc Parts

M3 Buttonhead Washer (5 Pcs.) - Choose Color (3 builds)

Misc Parts

Creamy Peanut Butter
See Site
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Sign in to comment

jdmkramer   16 days ago  

Beautiful build, and equally nice build log! I still haven't decided on what my first Radix 2 is going in :)

percisely   8 days ago 

Thank you! The Radix 2 is honestly overkill on this, but I love BrainFPV and had to get in on batch 1. Did you see that NASA used the same Bosch IMU on the Mars helicopter?

jdmkramer   6 days ago 

Nonsense! Your build deserves the best!

I didn't see that about NASA. That's great

Mafaku   8 days ago  

Beautiful build, thanks for sharing. You failed the Lightning Round though - the right answer is "crunchy"! ;)

percisely   8 days ago 

Only if you're running props-in on RaceFlight while fighting 40 chicken nuggets.

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