3" VX145 / Custom Build

By ghostface on Apr 07, 2018

6  806  13

Wen't for a very clean color coded look.
Very similiar in spec to the bnf xjb145 but custom build from discounted products on gearbest/banggood :)

About 140g dry with the cam holder top plate. 134g without it (I am removing it when flying without gps or an hd cam).

Meassured topspeed of 85mph / 136kmh with Rotorx 3044t props - I am now using gemfan flash 3052 which seem even faster.
Flight time is about 3-3.5 min. of rather aggresive flying.

  • XT60 heatshrinked to black, 3d printed softmounts for stack and motors as well as a 3d printed axii atenna holder
  • Custom 3d printed plate for the tx20 on f428 stack to fit an xm+ receiver
  • Optional GPS module for speed measurements - adds 9g to the build
  • UART6 and 5V/GND via seperate plugs to attach GPS or HD cam ala SQ12/Cyclops3

Photos

Part List

Frame

VX145 145mm Wheelbase 3mm Arm Carbon Fiber Frame Kit for RC FPV Racing Drone (3 builds)
Banggood.com
$18.00

Flight Controller

HGLRC XJB F428-TX20 V2 Omnibus F4 Flight Controller 28A 2-4S Blheli_S ESC 25/100/200/350mW VTX for RC Drone (27 builds)
Banggood.com
$79.00

Motors

4 x HGLRC FLAME 1407 3600KV Brushless Mini Motor 1PC - $13.57 | GearBest.com Mobile (9 builds)
M.gearbest.com
$54.28

Propellers

RotorX Triblade RX 3044TX Props (3CW, 3CCW) (32 builds)
Airbladeuav.com
$2.49

FPV Camera

HGLRC-XJB ELF MICRO CAMERA (9 builds)
Pirofliprc.com
$21.99

Antenna

Lumenier AXII U.FL 5.8GHz Antenna (RHCP) (148 builds)
Getfpv.com
$14.99

Receiver

Frsky XM+ Micro D16 SBUS Full Range Mini Receiver Up to 16CH for RC FPV Racing Drone (1534 builds)
Banggood.com
$13.69

Batteries

Tattu 14.8V 4S 850mAh 75C LiPo Micro Battery - XT60XT60 (12 builds)
Racedayquads.com
$19.49

Radio

FrSky ACCST Taranis Q X7 Transmitter 2.4G 16CH Mode 2 White Black International Version for RC Drone (253 builds)
Banggood.com
$154.04

Goggles

Skyzone SKY02S V+ 3D 5.8G 48CH FPV Goggles With Head Tracking HD Port DVR Playback for RC Drone (23 builds)
Banggood.com
$304.87

Misc Parts

8M Ublox M8N GPS Module for APM Pixhawk CC3D Naze32 F3 Flight Control for RC Drone (4 builds)
Banggood.com
$14.48

Radio Module

iRangeX IRX4 Plus 2.4G CC2500 NRF24L01 A7105 CYRF6936 4 IN 1 Multiprotocol STM32 TX Module With Case (5 builds)
Banggood.com
$36.99

Battery Charger

ISDT Q6 Pro BattGo 300W 14A Battery Balance Charger (47 builds)
Getfpv.com
See Site

Soldering Iron

MINI TS100 Digital OLED Programmable Interface DC5525 Soldering Iron Station Built-in STM32 Chip (258 builds)
Banggood.com
$53.99
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Discussion

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Ty2d2   Oct 10, 2018  

What is the reason for flying 3S vs 4S in this build?

Show 2 more comments
ghostface   Oct 10, 2018 

It's one of my favorite 3" so good choice!

  1. Yeah, pretty easy fit, no problem there even with my printed rx mounting plate. Used printed 8x TPU spacers over the m2 screws for soft mounting.
  2. Yes got it from here https://www.thingiverse.com/thing:2764226
    There is some more stuff like bumpers and sharkfins you can print.
  3. FuckTheFear 550 Paracord 7 core https://www.amazon.de/gp/product/B00OK6VX6K/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

I have a hmdvr-s mounted on top now and replaced the cam with a micro monster since posting the build.
Excuse the dirty quad - it has not been cleaned much :D
I'd recommend Gemfan 3052 Props! They rip!

ghostface   Oct 10, 2018 

Btw I personally have had great experience using the uxii instead of the axii in other builds. Uxii is a little smaller/lighter and the antenna cable is shorter - if I would rebuild this one I would use an uxii instead.
Some people think they are crap tho so a matter of opinion :)

Ty2d2   Oct 11, 2018 

Thanks a lot. That was a very big help

drumdude0   May 31, 2018  

Great build.

Will you tell me how tall the blue posts are in mm?

ghostface   May 31, 2018 

The vertical ones 25mm!

Sasquads   Apr 10, 2018  

Nice build. I want to build one of these too.
Where can I get one of those GPS module for speed measurements?
That would be cool to put on

Show 1 more comment
Sasquads   Apr 11, 2018 

Cool. I'm gonna order one. I got the same HGLRC stack, how do you connect that?
I thought you had to have a 10 DOF board for GPS but I might be way behind.

ghostface   Apr 11, 2018 

Nope you just need a free uart and hook up 5v/gnd/tx/rx - make sure to connect rx GPS to tx FC and tx GPS to rx FC
You won't get return to home or stuff like that as there is no barometer on it but for speed and location it works fine.

Check this for config https://diegofpv.com/how-to-add-gps-to-a-miniquad-with-betaflight-3-2/

Sasquads   Apr 11, 2018 

Thank you very much.
Going to do that for sure, I'm very curious how fast my 2,5 inch flies.

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