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drones/README.md
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# Drones
A collection of FPV drone builds ranging from tiny 85mm whoops to 5 inch
freestyle rigs. All flying on ExpressLRS 2.4GHz with a RadioMaster Boxer.
## Radio
- **Transmitter:** RadioMaster Boxer / ELRS 2.4GHz
## 85 mm - `85mm-hdzero/`
- **Name:** Bridges
- **Frame:**
- **Prop size:** 85 mm / tri-blade
- **FC:** Happymodel CrazyBee F405 (STM32F405) - BF: CRAZYBEEF405
- **ESC:**
- **BF version:** 2026.6.0-alpha
- **Receiver:**
- **ELRS firmware:** 4.0.0
- **VTX:** HDZero / OSD 4:3
- **Motor:**
- **Weight:**
## 3 inch - `3inch-walksnail/`
- **Name:** Lion
- **Frame:** JMT 115mm (Happymodel Crux3 compatible)
- **Prop size:** 3 inch / bi-blade / Gemfan Hurricane 3018 (3x1.8)
- **FC:** Flywoo F405S AIO (STM32F405 / ICM42688P) - BF: FLYWOOF405S_AIO, INAV: FLYWOOF405HD
- **ESC:** Flywoo 4-in-1 12A BLHeli_S (Z_H_30_REV16.7) / 1-2S
- **BF version:** 4.5.3 — **Note:** upgrading to 4.6 (2025.12.2) causes strange IMU orientation, unable to fly
- **Receiver:** ELRS Mini 2.4GHz (SX1280) Nano
- **ELRS firmware:** 4.0.0
- **VTX:** Walksnail Lite 1S
- **Motor:** HGLRC Specter 1202.5 / 11000KV / 1-2S
- **Weight:** ~74g (with battery)
## 3.5 inch - `3.5inch-hdzero/`
- **Name:** SAM
- **Frame:** Volador VX3.5 O3 Freestyle
- **Prop size:** 3.5 inch
- **FC:** Taker G4 45A 8Bit AIO (STM32G473 / ICM42688P) - BF: TAKERG4AIO
- **ESC:** Taker G4 4-in-1 45A (QF32MT / F4A AIO) / 2-6S
- **BF version:** 2026.6.0-alpha
- **Receiver:** Happymodel EP1/EP2 2.4GHz (ISM2G4)
- **ELRS firmware:** 4.0.0
- **VTX:** HDZero Race
- **Motor:** FlyFishRC Flash 1804 / 3500KV / 4S
- **Weight:**
## 5 inch - `5inch-walksnail-moonlight/`
- **Name:**
- **Frame:**
- **Prop size:** 5 inch
- **FC:**
- **ESC:**
- **BF version:**
- **Receiver:**
- **ELRS firmware:** 4.0.0
- **VTX:** Walksnail Moonlight 4K
- **Motor:**
- **Weight:**
## 5 inch - `5inch-hdzero/`
- **Name:**
- **Frame:**
- **Prop size:** 5 inch
- **FC:** Flywoo Goku F722 Pro V2 (STM32F722 / ICM42688) - BF: FLYWOO F722PRO, INAV: FLYWOO F722PRO
- **ESC:** Flywoo Goku G55M 4-in-1 55A AM32 (AT32DEVF421) / 3-6S
- **BF version:**
- **Receiver:**
- **ELRS firmware:** 4.0.0
- **VTX:** HDZero
- **Motor:**
- **Weight:**