Cinewhoop Bumblebee V3

WIP

Bumblebee

A space to keep track of all the parts needed to build this quad.

Frame

  • BumbleBee HD V3 Frame

Flight controllers

The current V3 ships with the F7 all in one however an older F4 would work just as well and having a stack (so the ESC’s on their own board) means if one craps out you dont have to replace an expensive AIO unit.

  • Beast F7 45A BLHeli-S true AIO board

Cheaper (and older) boards

  • Betaflight F4 flight controller

Others

ESC

40 amp seems to be the standard but depending on the props and motors I guess 20 would work too.

Motors

This frame is 12x12 m2 for the motors.

These are the suggested motors from iflight:

  • 4S XING 1408 3600KV (I think this was V1/V2)
  • 4S XING 2203.5 3600KV (currently shipped with V3 of the frame)

22 is the diameter in mm of the stator inside and 03.5 is its height.

Other motor sizes that will probably work are:

  • 1407
  • 1506
  • 1806

Battery

  • 4S 95C 1550mAh（6-7 minutes flight time w/GoPro Hero8）

DJI Air Unit

Wires

If the flight controller doesnt have a DJI port its still possible to solder it in, just make sure if you are using 6S you run though a BEC/Regulator.

The BEC is always ideal as it will give continuous clean power, the example in the video below was a 8V 3AMP (8x3 = 24 watts of power).

The air unit only needs 4 to 9 watts but its better to have more avalible to it (it will only draw what it needs). Apparently it will draw as much as 16 watts.

Common regulators are 9V 2AMP (9x2 = 18 watts)

If you are just running 4S then you can just use VBAT off the flight controller.

DJI Air Unit Wires

Region & Power changes

  • The Air Unit allows you to set the region with a text file naco.txt, set the region 1 (Country=US, Radio mode=FCC)
  • Save to the root of your SD card and pop it into the Air Unit
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naco.txt
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  • The Goggles allow you to set the power with a text file naco_pwr.txt
  • Save to the root of your SD card and pop it into the Goggles, this will allow up to 1000mw of power output (default is 25mw)
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naco_pwr.txt
pwr_1                         ~ this is 1000 mwah (this is the highest value allowed in the US)
pwr_1                         ~ this is 1200 mwah

Betaflight

You can download Betaflight Configurator from github, look for the assets drop down. Then these are the settings that worked with my F4 flight controller (OMNIBUSF4SD)

CLI

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version        ~ checks what firmware version is installed on the board

Setup

setup

Ports

  • Enable the UART that was linked to the DJI Air Unit above (the white and gray wires)

ports

Configuration

  • Mixer=Quad X : set the motors orientation
  • System configuration : I set the gyro & loop frequency to 8.00 kHz which is the highest. I dont think you can change the gyro speed on a F7 board.
  • ESC/Motor Features : DSHOT600 is the fastest
  • Board and Sensor Alignment : Yaw Degrees rotates the flight controller if you could not set it facing forward (look for an arrow on the board). Sensible values are 0, 90, 180 or 270
  • Arming : 180 is sensible so you can arm it on a surface that is not level

config

  • Airmode : turning this on will allow you to steer the quad in the air when you are letting it fall. IE: you have cut throttle.

config - other

  • SBUS connected receiver (mine is FUTABA)

config - receiver

Power & Battery

Check the total battery voltage with a muiltimeter, this should be the same as the voltage shown in betaflight. If its not drop the scale values until the shown voltage is the same.

power & battery

Receiver

Remove the props and power on the quad & radio. Then check the preview - the quad will probably be rotating or moving slowly.

receiver preview

  • Use SUB TRIM to trim these as close to 1500 as you can get them.

receiver

  • For Roll, Pitch and Yaw move the radio sticks to their extreme end points and use END POINT on your radio to to trim as close as you can get to 1000 and 1500

receiver

Modes

  • Arm : I use the far left switch F (AUX 1) to arm ON/OFF
  • Angle, Horizon I use switch C (AUX 2) to activate. Its a 3 position switch, up is Angle (self level mode). Middle is Horizon (Keeps pitch you set it at so you have to level it yourself). Down is Acro mode which means its all you :D

modes

OSD

These are the on screen display values that I thought would be useful - they are overlayed into my goggles and I can drag them around so they display where I want them to be.

  • Battery average cell voltage
  • Batter current mAh draw
  • Crosshairs

osd

Motors

Allows you to check the correct motors spin up, this confirms the orientation of the quad (front and back) and is helpful if you did not check the flight controllers arrow and set that to face forward.

  • Note this is NOT affected by Configuration -> Board and Sensor Alignment -> Yaw Degrees
  • See CLI mmix

References