HappyModel Crux35 HD V2 3.5 Inch 4S Ultralight Caddx Digital Nebula Nano System FPV Racing Drone

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HappyModel Crux35 HD V2 3.5 Inch 4S Ultralight Caddx Digital Nebula Nano System FPV Racing Drone BNF ELRS 2.4GHz


CRUX35/CRUX35 HD is an ultra-lightweight 3.5Inch FPV Freestyle FPV Racing Drone, the weight of the whole drone is only 87g for the analog version and 108g for the digital HD version. The Crux35 serials drone use Happymodel EX1404 high-efficiency motor and HQPROP 3.5-inch three-blade propeller to ensure the largest thrust-to-weight ratio under the most efficient premise, which can bring you a smooth Freestyle flying experience.

The HD version is equipped with CADDXFPV Nebula and Vista HD image transmission system. The analog version is equipped with CADDXFPV Ant ant camera.The receiver version can be SPI ExpressLRS and SPI Frsky (S-FHSS compatible) for choose.ExpressLRS is the most popular RC link system by now , it could performance very well with Crux35 and Crux35 HD.


  • Ultra-lightweight 3.5-inch BNF FPV Freestyle Drone
  • HD video transmission and analog video transmission are optional
  • Integrated ExpressLRS SPI receiver or Frsky SPI D8/D16 receiver
  • High efficiency EX1404 power system
  • Can be equipped with Naked Gopro or SMO4K
  • Support 3-4S battery 4S 750mah battery is recommended, maximum support 4S 1100mah


  • Brand: Happymodel
  • Model: Crux35 Analog / Crux35 HD
  • Wheelbase: 150mm
  • Weight: 87g ( Analog); 108g ( HD)
  • Size: 130mmx130mmx45mm(without propellers)
  • Version Optional: Analog / HD
  • Receiver optional: SPI ExpressLRS 2.4GHz /  SPI Frsky D8/D16 (S-FHSS compatible)
  • Camera option: HD version Nebula+Vista
  • Analog version Ant+OVX303 VTX
  • Flying time: 9min~15min 4s 750mah battery



Mode: EX1404
KV options: KV3500
Stator Diamter:14mm
Stator Length:4mm
Shaft Diameter: Φ1.5mm
Motor Dimension(Dia.*Len):Φ15mm*15mm


Propeller Diameter: 3.5 inch       
Pitch : 2              
Blades : 3
Material : Poly Carbonate        
Weight : 1.5g
Hub Diameter : 10mm           
Hub Thickness:4.7mm           
Shaft :1.9/1.5/1.9mm
Adaptor Rings : NO

Flight controller

(ELRS Version)

MCU:STM32F411CEU6 (100MHZ, 512K FLASH)
Sensor: MPU-6000(SPI connection)
Mount pattern: 20x20 M2


Power supply: 2-4S Lipo battery

Built-in 12A Blheli_s ESC each

Built-in Betaflight OSD(SPI Control)
Built-in SPI ExpressLRS 2.4GHz receiver

Built-in 5V 1A BEC

Flight controller firmware target: CRAZYBEEF4SX1280

Flight controller

(Frsky version)

MCU:STM32F411CEU6 (100MHZ, 512K FLASH)
Sensor: MPU-6000(SPI connection)
Board size: 28.5 * 28.5MM
Power supply: 2-4S battery input (DC 8V-17V)
Built-in 20A(each) Blheli_S 4in1 ESC Dshot600 ready
Built-in Frsky D8/D16 SPI receiver

Built-in 2.4G Power Amplification
Built-in Betaflight OSD(SPI Control)
Built-in Current meter
Built-in 5V 1.5A BEC
Built-in voltage detection

Firmware target: MATEKF411RX

Onboard 4in1 ESC

MCU upgraded to EFM8BB21
Power supply: 1S LiPo/LiPo HV

Current: 5A continuous peak 6A (3 seconds)
Support BLHeliSuite programmable
Factory firmware: O_H_5_REV16_8.HEX
Default protocol: DSHOT300

Onboard SPI ExpressLRS 2.4GHz Receiver

(ELRS Receiver version)

Packet Rate option: 25Hz/50Hz/150Hz/250Hz/500Hz
RF Frequency: 2.4GHz

Antenna : SMD antenna
Telemetry output Power: <12dBm

Receiver protocol to flight controller:  CRSF

Could bind with Happymodel ES24TX , ES24TX Lite, ES24TX Slim and DIY 2.4GHz ELRS TX module

Onboard SPI Frsky 2.4GHz receiver (Frsky Receiver Version)

SPI BUS receiver
Frsky D8/D16/EU-LBT/, Futaba S-FHSS switchable on Betaflight  
Channels: 8ch/16ch

Dual antenna
Failsafe support
No ground interference ( Transmitter and receiver 1 m from the ground): 400m

Caddx FPV Digital HD Camera Nebula Nano Kit

(Digital HD version)

Weight(camera included]: 24g

Antenna: 2.3g

Dimensions: Vista Kit 30×29×13mm

                     Camera 14×14×21mm

Operating Frequency: 5.725-5.850GHz

Transmitter Power[EIRP]: FCC/SRRC/MIC:<30dBm


Min.latencylend-to-end) 720p 60fps:32ms

Max.Transmission Distance FcC/SRRC: 4km


lnput Power: 7.4-26.4V

Power Output: 25mW/200mW/500mW/700mw

Goggles : Work with DJl goggles

Camera Sensor: 1/3”CMOS

Lens: 2.1mm,f/2.1

Shutter: Rolling

shutterFOV: 142°(D);122°(H);75°(V)

LHCP antenna

Caddx ANT 1200tvl camera

(Analog version)

Image Sensor: 1/3" CMOS Sensor

Horizontal Resolution: 1200 TVL

TV System: NTSC or PAL 

IMAGE: 16:9 or 4:3

Synchronization: Internal

Electronic Shutter: PAL: 1/50~100,000; NTSC: 1/60~100,000

S/N Ratio : >52dB (AGC OFF)

Video Output: CVBS

Lens: 1.8mm

Min. Illumination: 0.001Lux@F1.2

Auto Gain Control: YES


WDR: Global WDR


Dimensions: 14*14mm(with bracket to 19*19mm)

Wide Power Input: DC 3.7-18V

Work Temperature: -20℃~+60℃

Weight: 2g (N.W.)

OVX303 5.8Ghz VTX

(Analog version)

Model: OVX303

Frequency: 5.8G 40CH

Transmitting Power: 0/RCE/25mw/100mw/300mw

Power supply: DC 5V

Current (5v): <650ma (300mw)

Weight: 1.5gram without antenna

Recommended(Not Included):

  • 4S: 750mah Battery

Package Included (HD Version)

  • 1x Crux35 Frame
  • 1x CaddxFPV Digital HD Camera Nebula Nano Kit
  • 4x Happymodel EX1404 KV3500 brushless motor
  • 1x HQProp T3.5X2X3Grey (4cw+4ccw)
  • 1x Screw Driver
  • 1x Buckle for battery
  • Option1: ELRS X1 flight controller
  • Option2: CrazyF411 flight controller

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