Happymodel Crux35 Crux35HD FPV Racer Drone ELRS V2 User Manual

Happymodel Crux35 Crux35HD FPV Racer Drone ELRS V2

Features

Ultra-lightweight 3.5-inch BNF FPV Freestyle Drone

HD video transmission and analog video transmission are optional
Integrated ExpressLRS UART 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

Specifications

Brand: HappymodelProduct name: Crux35 / Crux35 HDZERO / Crux35 HD

Wheelbase: 150mm
Weight: Crux35 87gram Crux35 HD 108gram
Size: 130mmx130mmx45mm(without propellers)
Receiver option: UART ExpressLRS 2.4GHz
SPI Frsky D8/D16 (S-FHSS compatible)
Camera and VTX option:
HD DJI version Nebula+Vista or Runcam Link Wasp Nano
HDZERO version RunCam Nano HDZero Camera + HDZERO WHOOP VTX
Analog version Ant+OVX303 or OVX306 VTX
Flying time: 9min~15min 4s 750mah battery
Package includes

Item Name| Crux35| Crux35 HDZERO| Crux35 HD DJI
Crux35 Frame| 1| 1| 1
Option1: ELRS X1 FC with

SPI ELRS（Discontinued）

| 1| 1| 1
Option2:CrazyF411 ELRS FC

with UART ELRS

Option3: CrazyF411 FRSKY FC SPI Frsky
CaddxFPV Nebula Nano Kit

Or Runcam Link Wasp Nano

| 0| 0| 1
HDZERO Whoop VTX+ Rucam

HDZERO Camera

| 0| 1| 0
Analog FPV Camera Caddx Ant| 1| 0| 0
OVX303/ OVX306 5.8G analog VTX| 1| 0| 0
Happymodel EX1404 Kv3500| 4| 4| 4
HQProp T3.5X2X3Grey (4cw+4ccw)| 1| 1| 1
Screw Driver| 1| 1| 1
Buckle Velcro for battery| 1| 1| 1

Install propeller and mount the antenna holder

Default Propeller installation of Crux35 was set to be “Prop Out”, please install CCW propeller to Motor1 and Motor4 and install CW propeller to Motor2 and Motor3, make sure you have mounted the screws tightly for the propellers.

Bind procedure

Bind procedure video for your refrence http://bit.ly/40Kr4H8

1. Supply power to the flight controller by plug USB, wait until the green LED on the FC is off, immediately turn off the power, and then repeat again the above steps. When the FC is powered on for the third time, the green LED light will start to double-flash, which means that the RX enters the binding mode

2. Please make sure your ExpressLRS tx module firmware is v3.x.x. And go to ExpressLRS.lua from “TOOLS” menu of your radio transmitter. Then hit [Bind] to binding with the onboard ExpressLRS receiver. The green LED should blinking slowly first then turn to solid, that means binding was successfully. If the green LED still keep double flash after binding ,please change Model Match tab value from “off” to “on” or from “on” to “off”
   

3. Check the receiver channel map and channel value is correct after bind successful.
   
   Make sure the VTX band is “OFF” from the vtx administrator, sometimes it would affect VTX or RX quality .

Arm/Disarm the Motor

1. Turn on your radio transmitter and connect the battery to the Crux35. Then place Crux35 horizontally on the ground. We recommend 4S 750mah or 4S 850mah Li-po battery for Crux35 and Crux35 HD

2. Prepare your goggles, and match the channel with the VTX_table
   

3. Toggle Aux1 switch to arm the motors, the Green LED at the bottom of the flight controller would get be solid once armed, happy flying.

Flight controller connection diagram

Electronic hardware connection diagram

Analog version

Port setting and receiver setting

Analog version

HDZERO and HD OJI version

Voltage and Currents meter settings

PIO settings

Analog version

HD DJI and HDZERO version

Analog version VTX Bands and Channels setup

Frequency and channel frequency table:

There are 2 ways to switch the vtx channels:

1. If we need to use Channel 5705 then we should Go to Betaflight CLI,type the command:
   Set VTX_band=3
   Set VTX_channel=1 save

2. Disarm the Crux35 and then move the stick of the transmitter (THR MID+YAW LEFT+PITCH UP)to enter OSD Menu,Enter to Features,then enter to VTX SA to set VTX Band and channel
   

References

• Crux35 ELRS V2 bind procedure.mp4 - Google Drive

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