GRI BabyTooth v1

By GRIzmak on Mar 26, 2021

4  300  7

This was inspired by FPV cycle Baby tooth 1S.

Unfortunately, I was not able to source the FPV cycle parts. I had to find something to replace them.

  • I have ended using CrazybeeX Flight controller.
    1. I have desoldered motor plugs and soldered engine wires directly. This was mainly due to FlyWoo motors didn't have plugs.
    2. I have desoldered both antennas. The receiver antenna was replaced by FrSky receiver linear antenna. VTX antenna was replaced with bipole linear antenna. In both cases, I had to solder to the signal pad and the nearest GND. I do not have any photos of this, unfortunately.
    3. To be able to access the USB connector without removing the FC from the frame I have flipped FC upside down. After this, you will have to remap motor order and adjust FC orientation in Betaflight.
  • When designing this quad FlyWoo RB1202.5 11500KV motors was the closest to FPV cycle motors I could buy. I'm using a 1,5mm version. mainly because there are more propellers on the market.
  • Motor wires are routed on the "back" of the arms, looking from the propeller spinning direction.
  • I'm using XT30 for better conductivity. You need to change the plug on the battery fomr PH2.0 to XT30. I didn't found any 1S 450mAh or 650mAh battery with XT30.
  • For the canopy I'm using FEICHAO Camera Canopy for Mobula 6 HD canopy. I have designed adapter for Caddx Ant Lite camera.

I have been using CrazyBeeX v2.2 FC. The VTX and one of the ESCs have died. Now I have switched to the CrazyBee F4 Lite. Since this FC also had fried VTX, I have used HappyModel description to connect the external VTX to it. Described here:
I had to add the inductor (10uH) between the +5V line on the FC and the TBS Unify 32PRO nano VTX. The cammera is powered from the VTX passthough pins. Video signal and Smart Audio are connected directly to the FC. Without the inductor I had terrible video noise and screen rolls. Now it's flyable with minimal noise.

This FC have problem powering the VTX when set to more than 100mW output power. It will brownout during the flight. When you will switch back to 25mW or 100mmW everything is back to normal.

Whole drone weight is 49g without the battery.

I have rebuilded this quad in new version. GRI BabyTooth v2


Part List


FONSTER Apro 125mm 3 Inch X Type Toothpick Frame Kit 16x16mm / 25.5x25.5mm Mounting Hole compatible Runcam Nano 3 14.6g

Flight Controller

Happymodel – pièce Mobula6 Crazybee F4 Lite 1S contrôleur de vol AIO ESC Frsky Flysky récepteur et 25mW VTX pour Drone RC c


4 x Flywoo ROBO RB 1202.5 5500KV 2-4S / 11500KV 1-3S Brushless Motor 1.5mm Shaft for 2-3 Inch RC Drone FPV Racing (5 builds)


4 Pairs Gemfan Hurricane 3018 3x1.8 3 Inch 2-Blade Propeller 1.5mm Hole T Mount for RC Drone FPV Racing (4 builds)

FPV Camera

CADDX ANT Lite 4:3 FPVCycle Edition 1200TVL FOV165 globalny WDR PAL/NTSC przełączalna kamera Micro FPV do wyścigów FPV Tinyw (73 builds)

FPV Transmitter

Emetteur Micro vidéo VTX 5.8Ghz d'origine sct Unify Pro32 Nano 5G8 5.8Ghz


5PCS Eachine 5.8G 3dBi Brass Antenna Omni Directional IPEX Port for VTX01/VTX02/VTX03/ATX03 (4 builds)


Gaoneng GNB 1S HV 4.35V 450mAh bateria LiPo 80 z wtyczką PH2.0 dla RC FPV mały dron TINY7 (9 builds)


RadioMaster TX16S Hall Sensor Gimbals 2.4G 16CH Multi-protocol RF System OpenTX Mode2 Transmitter for RC Drone (96 builds)


Skyzone SKY03O Oled /SKY03S 5.8GHz 48CH Diversity FPV Goggles Support OSD DVR HDMI With Head Tracker Fan LED For RC Racing Drone (47 builds)

3D Printed

Happy Model Crux Caddx Ant Lite adapter by GRIzmak (4 builds)
See Site

Misc Parts

FEICHAO – auvent de caméra pour Mobula 6 HD, Drone Quadcopte de course sans balais, Mini FPV, pièces de course d'intérieur

Radio Module

JUMPER JP4IN1 Multiprotocol TX moduł CC2500 NRF24L01 JP4 in 1 wieloprototypowy moduł RF Tuner TM32 wersja OpenTX dla Frsky/Fly

Battery Charger

ToolkitRC M6D 500W 15A High Power DC Dual Smart Charger Discharger for 1-6S Lipo LiHV Lion NiMh Pb Battery (19 builds)

Soldering Iron

MINI TS100 Digital OLED Programmable Interface DC5525 Soldering Iron Station Built-in STM32 Chip (264 builds)


Fpv Drone Backpack Iflight Backpack Drone Bag Double Shoulder Packet Auction FPV QAV250 IX5 V2 Packet Large Capacity (3 builds)
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lazyturtles   May 01, 2021  

Did you have to flip FC upside down or kept it as it is? The reason why I am asking is that I've got the same Apro 125 frame, Flywoo motors, Ant Lite camera, etc. to create a babytooth my own but do not have the BeeBrain canopy that everybody uses, and I wonder how I can set it up to have USB port access...

GRIzmak   May 10, 2021 

Yes, I had to flip the FC. Unfortunately I have to take the canopy off to access to the USB. Now I'm using the FEICHAO canopy. I find it most durable of all tested. I have tried the mobula 6, modula 7, Eachine Cinefun, Eachine Canopy for UZ65 and the Happymodel Crux3 canopy. They are all very fragile. I have ended breaking them every 2 days. Happymodel Crux3 is second toughest I have used. You can cut off back side of it and then you will have access to the USB port.

BUDLoNG   Mar 26, 2021  

for 1S you can loose the prop bolts and save a gram or two.
I run 2s with no bolts for that reason :)

GRIzmak   Mar 26, 2021 

I have put the bolts on since I feel the props a bit loose. I'm not a pro and I can't feel this 1-2g. I was aiming to be below 60g fly weight. Almost there. :) But for me it is enough. Now I get between 4 and 6 min on 450 mAh battery.

GRIzmak   Apr 28, 2021 

I have removed the propeller bolts. The propellers are holding very well. I expected them to be flying off every 5s. Thanks for the advice.

upioneer   Apr 02, 2021  

nice 3in build! tbh i been feeling the micros more than 5in lately

GRIzmak   Apr 04, 2021 

They are great for tight environments like garden around the house. And they are quiet so you are not bothering neighbors..

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