GRIzTooth 2.5

By GRIzmak on Apr 01, 2021

9  262  4

This build is my first attempt to build a toothpick.

I took all the parts from Mobula 6 and put them on the BetaFPV HX100SE frame. Also, I have swapped the motors to 1102.

The first iteration of this build used BetaFPV 1102 KV18000 motors. They are way too fast for what I was trying to achieve.
I replaced FC with CrazyBee v2.0 FR when ESC on it died.
I've added TBS Unify 32 nano since CrazyBee 2.0 don't have VTX. At the same point,
I have replaced motors with EX1102 KV13500.
I have replaced the "wire" antenna with a coaxial linear antenna to improve the control link. I have heat-shrink it to zip tie to avoid chopping by the propellers.

I have tried three types of propellers.

  • BETAFPV Gemfan 65mm 2-Blade (very soft and flexible, easy to bend and damage in a crash)
  • HQ Prop Micro Prop 65mm Bi-Blade 2.5 (stiffer than BetaFPV ones, they can crack motor shaft on EX1102)
  • GEMFAN 65mmS 65mm 2 Paddle (same as above)
    I like the most the GEMFAN and HQ props. Unfortunately, they can crack the shaft on the EX1102 Motor.

Maybe I had to drill a bit the propeller in the bottom to hide the c-clip and this way the shafts wouldn't crack as much as they are now.

I had problems with the vibrations. I found that it was due to not tighten screws holding the FC. They are loosining over a time. Even if I use nylon lock nuts.

Currently I'm using the BetaFPV 18000KV 1102 motors. It seems they are holding preatty well. They are bit too fast for what I'm loooking. But they are not loosing the shaft. I plan to change them to BetaFPV 13500KV 1102.

Curently I have switched to Caddx Ant Lite camera. It have much better image compared to the Runcam nano 3.

I have also changed the canopy for the FEICHAO Camera Canopy for Mobula 6 HD. It's holding pretty well. And not flying gentle.

Whole drone without the battery weights 37g.


Part List


BETAFPV 2pcs HX100 SE Toothpick Frame T300 Carbon Fiber Frame Kit for HX100 SE 1S Toothpick Quadcopter 1102 13500KV Motor (3 builds)

Flight Controller

Crazybee F4 Pro V2.0 1 3S kompatybilny kontroler lotu dla Mobula7 HD Mobula 7 wewnętrzny odbiornik Frsky/Flysky/DSM X (5 builds)


1/2/4PCS/Lot Happymodel EX1102 9000KV 10000KV 13500KV 2 3S Brushless Motor Original for Mobula7 HD RC Drone Spare Part DIY Accs


5Pairs HQ Prop Micro Prop 65mm Bi Blade 2.5 1.5mm Shaft Propeller For FPV Racing RC Drone Quadcopter Spare Parts Accessories

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

Update 500mw+ Original TBS Unify Pro32 Nano 5G8 V1.1 5.8Ghz Micro Video Transmitter VTX 5.8Ghz for RC FPV Drone plane DIY Toys


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


Gaoneng – batterie Lipo 650mAh 3.8V 60C/120C HV, prise PH2.0 pour Drone RC Tinyhawk Happymodel Snapper7 E010 M80S Tiny7 Beta85


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

HappyModel 2.4G ExpressLRS ELRS Starter Set ES24TX 2.4G Micro TX with 3PCS 2.4G EP1 EP2 RX for RC Airplane FPV Long Range Drones

Radio Module

NAMIMNO ELRS 2.4GHz Flash Micro TX Module (2 builds)

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)

Battery Charger

ISDT Q6 Nano Q8 Lite 500W For Pocket Battery Balance Charger For RC Parts English language version

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)
Show stores (7)


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KristofFPV   Apr 21, 2021  

My favorite frame and canopy in 1S builds :) I built them on 0802 19000kV and 1102 10000kV motors. I also have the 2S 1102 6000 kV version.

GRIzmak   May 10, 2021 

Hi, yes it's a very nice frame. I think I'm frying too aggressive. I'm have broken 6 of them in the last 6 months. Now I will be rebuilding this quad to 3-inch props. I will build this on FONSTER Apro 125mm 3mm and RCINPOWER GTS V2 1202.5 11500KV motors. Very similar to GRI BabyTooth v2.

yohfpv   Apr 17, 2021  

Nice build. You can try HQ T65 props with nylon prop screws to address some of your problems. The T65's rev up smoothly to high rpm's as long as you have the props balanced. The props screws should hopefully protect your motor shafts better in crashes. If you motors have c-clips on top of the bell, you can try drilling shallow counter-sunk holes on the bottom of the props to allow the props to sit flat all the way down on the shaft against the bell to improve strength. Thankfully my motors don't have c-clips on top of the bell so I didn't have to modify my T65's. Happy flying.

GRIzmak   Apr 28, 2021 

Thanks for the tips. I will try them out in next iteration of this build. Right now I'm using BetaFPV motors 18000KV. They are a bit too fast. But they are holding. I have around 4-5min of flight on 450mAh and up to 6min on 650mAh.

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