Emax Babyhawk Micro Brushless FPV Quadcopter

Emax Babyhawk

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At a $100 average retail price, the 85mm Emax Babyhawk is the first affordable micro brushless FPV quadcopter. It comes as plug-and-play, which requires a flight battery and, thanks to its F3 Femto Flight Controller, a receiver from a variety of capable protocols.

Emax Babyhawk Features

  • AIO 800TVL CMOS Camera, 25mW VTX, Dipole Antenna
  • Femto F3 FC w/Integrated PDB, SPRACING F3EVO Firmware
  • Emax Bullet 6A BLHeli_S 2S Plug-in ESCs
  • Emax 1104 5250Kv Brushless Motors
  • 2.3″, 4.5″ Pitch, Bullnose Propellers
  • Molded Polycarbonate Plastic Airframe
  • Molded Polycarbonate Plastic Prop Guards

Flight Controller Remount
The factory installed double-sided foam tape under the flight controller on my Babyhawk did not stick well and was loose when received. I replaced it with two layers of 3M Scotch 30lb Extreme Mounting Tape. Since the original tape was still stuck to the airframe and not the FC, I increased the width of the tape to allow more adhesion to components on the FC. The photo below shows the original double-sided foam tape removed. Another factory flub: You can flip the ESCs over, remove tape backing and stick them to the airframe.

Emax Babyhawk Flight Controller Remount
Emax Babyhawk Flight Controller Remount

The Emax Babyhawk comes as plug-and-play (PNP), meaning it requires a receiver to operate. Just as I did with my HolyBro Shuriken 180 Pro, I went with the ultra-reliable Lemon Rx DSMX-Compatible Diversity Satellite Receiver with long antennas. I have had zero problems with Lemon Rx receivers and can’t say enough good things about them!

Lemon Rx DSMX-Compatible Diversity Satellite Receiver
Lemon Rx DSMX-Compatible Diversity Satellite Receiver

Receiver Case Removal
I removed the Lemon Rx Satellite Receiver from its plastic case and put clear Polyolefin heat-shrink tubing around it. The white material on one end is white vinyl electrical tape that I wrapped around the end before installing the heat-shrink tubing. This keeps the edge of receiver from making contact with the 3 pins on the flight controller.

Lemon Rx Diversity Satellite De-cased and Wrapped
Lemon Rx Diversity Satellite De-cased and Wrapped

Receiver Wiring
With only 3 wires to solder, connecting the Lemon Rx Satellite Receiver was super easy. It requires 3.3V for power so I soldered the Positive lead to the FC boot pad in the corner, as opposed to the SBUS pins. I soldered Ground and Signal to the SBUS pins and put a piece of heat-shrink tubing over the unused 5V center pin. I used a satellite pigtail that I had instead of cutting down the original Lemon Rx Satellite cable. The Emax F3 Femto PDF has nice color diagram showing how to connect different receivers.

Lemon Rx Satellite Wiring or Pinout Diagram
Lemon Rx Satellite Wiring or Pinout Diagram
RX to FC Wiring Diagram
Lemon Rx Satellite to Flight Controller Wiring Diagram

Other radio brands/protocols shown here: Emax Femto F3 FC with Integrated PDB

Lemon Rx Satellite Receiver Pigtail Soldered to FC
Lemon Rx Satellite Receiver Pigtail Soldered to FC

Receiver Installation
The most prevalent receiver mounting locations on the Emax Babyhawk are on back of the FPV camera housing, and in my case, directly on top of the FC. The Lemon Rx Satellite is fairly secure just sitting on top of the FC, under wires and in between the FPV camera stanchions. However, I can always add double-sided foam tape later on if needed.

Emax Babyhawk with Lemon Rx Satellite Receiver Installed
Emax Babyhawk with Lemon Rx Satellite Receiver Installed

Antenna Orientation and Mounting
Orientation of dual diversity antennas should be as close as possible to 90-degrees. There are a few options for diversity antenna placement on the Emax Babyhawk. They can be ran down two arms of the airframe or one down through to the bottom and one on top. I mounted the longer Lemon Rx antennas on top in white plastic tubes, which are from cotton swabs, and secured them with tie-wraps to plastic brackets attached to the camera housing screws. The screws are long enough to retain the original nylon locking nuts.

Lemon Rx Antenna Satellite Orientation and Mounting
Lemon Rx Satellite Antenna Orientation and Mounting

FC Configuration for Receiver
Steps I took to configure the Babyhawk Femto FC for the Lemon Rx Diversity Satellite Receiver:

  • Install STM32 VCP Driver (Windows 7 Pro laptop). Launch Betaflight (Bf).
  • Bf Ports: disable UART1 (MSP off), enable Serial RX (not MSP) on UART3, click Save and Reboot.
  • Bf Configuration: set Receiver to Serial-based Receiver (SPEKSAT, SBUS, etc.), set Serial Receiver Provider to SPEKTRUM2048 (DX18 radio), click Save and Reboot.
  • Bf CLI commands: “set spektrum_sat_bind=9” and “save” (auto-bind satellite).
  • Physically bind transmitter and receiver.
  • Bf CLI commands: “set spektrum_sat_bind=0” and “save” (removes auto-bind).
  • Bf CLI command: “dump” then copy and paste into text file to save a backup.
  • Set TX Channel Reversing and Travels. Example: Radio Setup for Shuriken 180 Pro
  • Set Modes in Betaflight and TX. Example: Betaflight Setup for Shuriken 180 Pro

Battery Cushion Grip Pad
I try to repurpose things whenever possible. One thing that came in handy for this build was an old ball style mousepad with Closed Cell Neoprene Sponge Rubber backing, which is grippy and has just the right amount of cushion for the battery. I cut a section from the mousepad and glued it to the bottom of the airframe using Loctite Stik’n Seal Adhesive.

Emax Babyhawk Battery Cushion Grip Pad
Emax Babyhawk Battery Cushion Grip Pad

Update: Battery Strap Adhesive
Straps on good motocross goggles have beads of silicone glue on the inside to help keep the goggle in place on the helmet. I borrowed this feature for the Babyhawk battery strap to help keep the battery more secure. I supposed Silicone glue would have also worked here but I used Loctite Vinyl, Fabric & Plastic Transparent Flexible Adhesive because it flows out a little more (less viscous), making a thinner layer. I used 2 coats to create a nice soft rubber-like layer on the inside surface of the battery strap.

Battery Strap Adhesive
Battery Strap Adhesive

Flight Batteries
Emax recommends a 300mAh 2S LiPo battery for the Babyhawk. I absolutely love the Thunder Power 220mAh 1S FPV Adrenaline 50C Batteries for my Inductrix quads, Tiny Whoops and UMX aircraft so when deciding what battery to use for the Emax Babyhawk, the Thunder Power 325mAh 2S 7.4V Rampage 70C LiPo Battery was my first choice.

Thunder Power 325mAh 2S 7.4V Rampage 70C LiPo Batteries
Thunder Power 325mAh 2S 7.4V Rampage 70C LiPo Batteries

Thunder Power 325mAh 2S Rampage 70C LiPo Specs

  • Max Charge: 12C or 3.9A
  • Max Cont. Discharge: 70C or 22.75A
  • Max Burst Discharge: 140C or 45.5A
  • Weight: 23g Avg measured
  • Dimensions: 11 x 25 x 45mm
  • Connectors: JST-RCY Main, JST-XH Balance

Update: The Thunder Power 325mAh 2S Rampage 70C LiPo Batteries are turning out to be a GREAT little battery for the Babyhawk! They are light, almost no sag, and fly for a good 3 to 3.5 minutes of hard flying with flips and rolls while under the goggles.

Transmitter Setup and Betaflight Configuration
Transmitter setup and Betaflight configuration were similar to that of my HolyBro Shuriken 180 Pro except I have not yet updated the version of Betaflight that came pre-flashed on the Emax Babyhawk, which was 3.0.1. I will edit this page with any updates as I do them.

Emax Babyhawk Weights

  • Babyhawk with props: 60g
  • Babyhawk with props and guards: 68g
  • Babyhawk with props, guards and Lemon Rx satellite: 72g
    (Babyhawk flying weight minus battery: 72g)
  • Babyhawk AUW with TP 325mAh 2S 70C LiPo Battery: 95g

Screw Head Sizes
The hex or allen head wrench or driver that fit best in the screws on my Babyhawk were 1.5mm or a well used 1/16″ for the larger headed screws (airframe and props) and a 1.3mm or 0.050″ for the motor/prop guards. Note: If you remove the prop guards for flight, make sure to use the shorter length screws so they do not protrude into the motor windings when tightened down.

Parts Used in Emax Babyhawk Build

Emax Babyhawk Videos

Further Help Setting Up Babyhawk
If you need further help with setting up an Emax Babyhawk, there are some decent videos on YouTube. Here are a few:

Close-ups, Feedback and Reviews
To be more mobile friendly, photos on TazRC are limited in size. I would be happy to post any close-up photos on request. Just leave a comment below. Also, feel free to leave your feedback or personal review on the Emax Babyhawk. Registration not required.

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9 Comments about Emax Babyhawk Micro Brushless FPV Quadcopter

  1. Clean build! Great idea on the antenna tubes. Don’t mind if I use it. How long are you getting with the Thunder Power Rampage batteries? I have the Adrenaline’s for larger quads and have really good luck with them. Thanks for the tips. Dan

  2. Thanks for the kind words, Dan. Feel free to use anything here, that’s why I created TazRC. TP Rampage batteries are just as good as the TP Adrenaline’s. 3.5 minutes of easy flying is typical with the 325s.

  3. I thought this was one of the best build tutorials for the Baby Hawk but unfortunately when I started the bind process and the Betaflight configurator things didn’t go right. None of my settings took hold and it finally burnt up the Lemon RX after several attempts to bind.

  4. UPDATE: The Lemon RX burnt due to high voltage from the esc pad. It takes good eyes to see these details. I’ll have to try again.

  5. Thanks for the update, Frank! Sorry to hear about your miswire. I know these PC boards and pads are getting smaller and require superhuman-like vision. I’ve updated this article with an edited version of the F3 Femto FC wiring diagram specific to installing the Lemon Rx satellite receiver. Hope that helps folks in the future.

  6. I just bought it and I cannot fly it, could you help me? I have a TX “FS-I6s” and a receiver “FS-A8S”.
    1. I do not know where to solder the signal,
    2. Binding was successful I guess but I still cannot fly it :/
    3. What are the settings for the transmitter and Cleanflight?

  7. Hi Azurean. Unfortunately I don’t have experience with FlySky radios. However, aside from the radio, most of the setup should be very similar. From what I’ve read, that RX can output SBUS or PPM. I would try SBUS wired per the Emax Femto FC Diagram and on 5V pad. As far as setting up Betaflight, you may want to watch the Gremlin Video by TJ, minus the sections on soldering it all together and flashing. I would first use the firmware that came on your Babyhawk. Hope that helps some.

  8. What gyro & pid loop hz. should i be using? I just updated to bf 3.5.7 and I lost it Thank you

  9. Hi there, this requires me to fire up a Windows laptop that I rarely use anymore but I’ll try to get it for you soon.:)

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