Varvatus Vex v1.0 - The 3D printed 5'' Beginner Freestyler

By moserello on May 14, 2020

7  187  1

This is the first version of our FPV 5 inches freestyle quad.
We wanted to build a cheap drone, without giving up a good performance.

With this in mind, we decided to use a F7 Holybro Kakute All In One as a flight controller, and after one year of flights I can confirm that is really reliable, with a large number of UARTS: that's perfect for any quad. The original frame designer suggested to use 2204 motors, but we preferred to upgrade them to the Racestars 2205 2300KV version. These motors have a very good performance for this setup and they work like a charm (even after many crashes).

This build uses the 35A HAKRC DSHOT1200 ESCs that are very solid and work great.
The Caddx Turbo camera provides good quality images, especially if coupled with a good 1000uF Low-ESR capacitor on the battery main leads.
The VTX is a Eachine TX801 that provides current directly to the camera.
Since camera and VTX are energy demanding, in order to have a clean video, we have to provide the same exact ground potential to both. In order to reduce noise on video signal then, I suggest to add a cable that connects the negative of the camera (powered by the VTX's negative output) with the ground pad on the FC that you use to provide the negative to the VTX .
This setup, coupled with a Pagoda 2 antenna, will give you high quality images with a huge range (500-700 m) at only 200mW.

The Batteries used are 4S:

  • TURNIGY GRAPHENE: 1600mAh 75/150C (very good batteries)
  • TURNIGY Nano-Tech 1800mAh 70/150C

In order to print the Peon230 frame, I suggest to use PETG instead of PLA or ABS for its mechanical properties. You will find more informations at this link Peon230

As for the build, also the Gear were not chosen to be the best ones, but rather to be a good starting point.
For this reason the cheap Eachine EV800D is perfect for beginners. It has a built in DVR to record all the flights, that's a very useful feature in the case you lose your quad: you can view the recorded video in order to understand where to search in an accurate manner. It also has a 5.8GHz Video receiver with a double diversity antenna, that we suggest to use with both a omni and a patch antenna (included with goggles).

The FlySky FS-i6X is a very cheap radio, but we think it's the best at its incredible price. It does its job well enough, in terms of reliability and initial needs, and it's a lot better than we expected before purchasing it. Of course you have to renounce to some features that other transmitter may have, but you can get one at about 40€.


Photos

Part List

Frame

CCTREE® 1.75mm 1KG/Roll Black/White/Blue/Red/Green/Transparent PETG Filament for Creality CR-10/CR10S/Ender 3/Tevo/Anet 3D Prin
Banggood.com
See Site

Flight Controller

Holybro Kakute F7 AIO V1.5 STM32F745 Flight Controller w/ OSD PDB Current Sensor Barometer for RC Drone RC Parts from Toys Ho
Banggood.com
See Site

ESCs

4 x HAKRC BLHeli_32 Bit 35A 2-5S ESC Built-in LED Support Dshot1200 Multishot for FPV RC Drone RC Parts from Toys Hobbies and Rob (16 builds)
Banggood.com
See Site

Motors

4 x 4X Racerstar Racing Edition 2205 BR2205 2300KV 2-4S Brushless Motor Dark Blue For 210 X220 250 280 RC Drone RC Parts from Toy (5 builds)
Banggood.com
See Site

Propellers

10 Pairs Kingkong / LDARC 5x4.5x3 5045 5 Inch 3-Blade Propeller CW CCW for RC FPV Racing Drone RC Parts from Toys Hobbies and (26 builds)
Banggood.com
See Site

FPV Camera

Caddx Turbo EOS2 1200TVL 2.1mm 160 Degree 1/3 CMOS 16:9 Mini FPV Camera NTSC/PAL For RC Drone RC Parts from Toys Hobbies and (2 builds)
Banggood.com
See Site

FPV Transmitter

Eachine TX801 5.8G 72CH 0.01mW 5mW 25mW 50mW 100mW 200mW 400mW 600mW Switched AV VTX FPV Transmitter RC Parts from Toys Hobbi
Banggood.com
See Site

Antenna

GEPRC GEP-Pagoda2 5.8G 2dBi FPV Antenna SMA/RP-SMA RHCP/LHCP 6cm 60mm RC Parts from Toys Hobbies and Robot on banggood.com (3 builds)
Banggood.com
See Site

Receiver

Flysky X6B 2.4G 6CH i-BUS PPM PWM Receiver for AFHDS i10 i6s i6 i6x i4x Transmitter (175 builds)
Banggood.com
$11.06

Batteries

Turnigy Graphene Panther 1600mAh 4S 75C Battery Pack
Hobbyking.com
$31.81

Radio

Flysky i6X FS-i6X 2.4GHz 10CH AFHDS 2A RC Transmitter With X6B/IA6B/A8S Receiver for FPV RC Drone (21 builds)
Banggood.com
$56.99

Goggles

Eachine EV800D 5.8G 40CH Diversity FPV Goggles 5 Inch 800*480 Video Headset HD DVR Build in Battery
Banggood.com
$88.99

3D Printed

Peon230 - Quadcopter by Tech2C
Thingiverse.com
See Site

Misc Parts

Suleve™ M3NH6 300Pcs M3 Nylon Screw White&Black Hex Screw Nut PCB Standoff Spacer Assortment Kit Fasteners from Tools, Indu
Banggood.com
See Site

Misc Parts

Machifit 4pcs M3 8x8mm Rubber Mounts Double Ends Screw Anti Vibration Mount Rubber Shock Absorber Mechanical Parts from Tools
Banggood.com
See Site

Soldering Iron

MUSTOOL SD1 SD2 LCD 60W Soldering Station Professional PID Soldering Iron Station Tool Kit Adjustable Temperature 200-480°C wit
Banggood.com
$24.99

Backpack

Realacc Backpack Case with Waterproof Transmitter Beam port Bag Tool Board for RC Drone FPV Racing (11 builds)
Banggood.com
$61.79
Show stores (3)

Discussion

Sign in to comment

Tyrdle   24 days ago  

ouch man

Guides & Reviews

39 4,135  47
May 05, 2020

This guide will walk you through the process of building your first FPV quad. The goal with this design was to build a low-cost, lightweight quad, yet powerful enough to safely carry a GoPro in close proximity areas. I chose these parts to minimize the amount of soldering at no cost to the quality. A typical build requires around 30 solders while this only needs 25. It's not a huge difference, but..

Read more
28 7,901  38
Nov 30, 2019

In late 2019 DJI made inroads into the FPV scene with their remarkable low-latency digital system. It gave us a 720p video feed with latency on-par with the status quo, analog video. Traditionally we've used analog video systems for low-latency video, but the video quality is far from ideal. It's a trade-off we've been willing to accept for the control. Now we've got the best of both worlds and what..

Read more