title: quadrocopter
date: 2019-06-20
author: Philipp Schönberger
tags: bataflight, quadrocopter, fpv
category: projects

Infected by the other members of the Toolbox e.V, especialy [Thomas](https://www.xythobuz.org/)
I started to search for parts for a quadrocopter which could be used to race and do some
freestyle moves.

Since for me also the assembly is new and I had the feeling that this quad will also be
likely to be damaged I wanted to build it with seperate components. Also its more fun that way.

Since I did not want to have a huge quad I wanted to hit the 250g Law limit for the assembly.
In such a case I would not even be forces to add a burn resistent name tag to the quad, which I
would anyway recomend if it could be lost.

After some search i found the [Diatone quad frame GT M3](https://www.banggood.com/Diatone-2018-GT-M3-130mm-Normal-X-FPV-Racing-Frame-Kit-RC-Drone-3mm-Arm-p-1257062.html) prity aplealing since they have a aluminum cage for the pcb stack and a 3mm carbon plate which is robust enought for a beginner.

[lightgallery
    /images/quad/diatone_130.jpg, Diatone 2018 GT M3 130mm
lightgalleryend]

The following motors where selected by taking the recomendations of the frame into account:
     motorsize 1408
     motorr 4000KV

The motor size of brushless motors for quadrocpters are regulary indicated by a 4-digit number
The first two digits represent the stator width or diameter while the second ones represent the hight.
The values types are in mm

In general the motor size have quite a infulence of the flight caracteristics.
A taller motor most likely result in more power at the upper Throttle/RPM and a wider motor
would result in a higher torque at low throttle.

Since i wanted to use motors with a actual datasheet or at least a messurement how much amps
would be drawn by them with a certain propellor i took the [T-Motor F20II F20 II 1408 3750KV](https://www.banggood.com/T-Motor-F20II-F20-II-1406-3750KV-Brushless-Motor-2-4S-For-130-140-150-FPV-Racing-Frame-p-1154351.html)


[lightgallery
    /images/quad/motor.jpg, T-Motor F20II F20 II 1408 3750KV;
    /images/quad/motor_datasheet.jpg, T-Motor F20II F20 II dimensions;
    /images/quad/motor_datasheet2.jpg, T-Motor F20II F20 II electrical specification;
    /images/quad/motor_datasheet3.jpg, T-Motor F20II F20 II load specification with diferent propellor sizes;
lightgalleryend]

At this point the Motors and Frame where clear. The next step was to choose a propellor type.
For this I selected a tri bladed one with close to the 3040 size. The size for

part list:

- [Diatone quad frame GT M3](https://www.banggood.com/Diatone-2018-GT-M3-130mm-Normal-X-FPV-Racing-Frame-Kit-RC-Drone-3mm-Arm-p-1257062.html)
- [T-Motor F20II F20 II 1408 3750KV](https://www.banggood.com/T-Motor-F20II-F20-II-1406-3750KV-Brushless-Motor-2-4S-For-130-140-150-FPV-Racing-Frame-p-1154351.html)
- [flightcontroller ](https://www.banggood.com/HGLRC-20x20mm-Micro-F4-Flight-Controller-AIO-Betaflight-OSD-5V-BEC-for-XJB-F425-F428-Series-Flytower-p-1203538.html)
- [esc](https://www.banggood.com/20x20mm-28A-BLheli_S-BB2-2-4S-4-In-1-ESC-Support-Dshot600-for-XJB-F428-F328-Series-Flytower-p-1203121.html)
- [props](https://www.banggood.com/10-Pairs-Geprc-3042-3x42-Inch-3-Blade-Propeller-M5-Mounting-Hole-CW-CCW-for-Racing-Drone-p-1190428.html)
- [cam](https://www.banggood.com/RunCam-Micro-Sparrow-WDR-700TVL-13-CMOS-2_1mm-FOV-145-Degree-169-FPV-Camera-NTSCPAL-Switchable-p-1198579.html)
- [VTX]()
- [frsky receiver](https://www.banggood.com/FrSky-R-XSR-Ultra-SBUSCPPM-D16-16CH-Mini-Redundancy-Receiver-1_5g-for-RC-Multirotor-FPV-Racing-Drone-p-1186057.html)
- [beeper](https://www.banggood.com/Super-Mini-1_38g-WS2812-Colorful-LED-with-5V-Active-Alarm-Buzzer-Support-Cleanflight-Betaflight-p-1131891.html?rmmds=myorder&cur_warehouse=CN)