Tooth Fairy 4" - GPS HD 240g

By Etolier on Feb 24, 2019

16  541  5

I've really been working to get a really good sub-250g setup going on 3" or 4" that has a lot of functionality. Namely, I wanted GPS, some way to record 1080p60, and also to move away from linear VTx antennae, while still retaining a race/freestyle level of performance. Judging by the maiden flight, this will be the go-to setup that I fly, particularly since I'm now inside of Class D airspace to the ground, surrounding KGJT.

The stack was pretty time consuming to fit - it's a series of M2 standoffs that eventually connect to the Split Mini board, and the ESC and FC actually slip over using M3 isolation grommets, and are held in place with M2 washers. The stack is extremely tight and allows me to use an F7 FC with loads of UARTS. A Matek GPS sits on top - it picks up 10-12 sats with no issue, and GPS rescue seems to function well. I was able to get the compass to register on UART 3, however it jumps all over the place and no matter how I set it up, it never settled down, so it's disabled for now. I may try another unit, or just leave it disabled.

The TBS Unify Nano is the perfect solution for micro quads - I wasn't too impressed with the output power of the Mini Magnum VTx on previous 3" & 4" setups, so I'm pretty excited to couple the Nano with the also-new TrueRC Singularity, which gets me ~400mW out of a CP antenna for something like 3 grams.

APC props are pretty good compared to a lot of other 4" options (there aren't any real standout props like there are in the 3" range). I tend to gravitate towards lightweight and stiff, and these are least stiff. Preferable to the glass 4040s or any other 4" triblades I've tried. I also have some 4045 APC biblades that I will try.

I've had two Runcam Split cameras that have had the mode switch button just fall off after being pressed ~5 times. Fortunately, that's just enough to set everything up and then wait for a replacement board from Runcam. I noticed in the miaden flight (below) that it was somewhat out of focus, and I was getting some pretty rough jello. After checking the cam later, I found the focus lockring was also cracked and allowing the lens to vibrate around. Sketchy...

Overall, I like this setup and I'm looking forward to fine-tuning, and also using some of these things in future builds.


Part List


HyperLite ToothFairy 4" Race Frame 14xx Pattern (4 builds)

Flight Controller

Talon F7 BB 20X20 Flight Controller (4 builds)


Aikon AK32PIN 4-in-1 35A 6S 20x20 (54 builds)


4 x Hyperlite 1407-3600 Race Series (2 builds)


4x4E-3-B4 | APC Propellers


4x4.5E-B4 | APC Propellers

FPV Camera

RunCam Split Mini 2 FPV / HD Camera M12 Lens (89 builds)

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 V1.1 (365 builds)


TrueRC Singularity U.FL 5.8Ghz Antenna (Short) (5 builds)




Pyrodrone Graphene 700mAh 4S 14.8V 75C - XT30 (8 builds)


TBS Tango 2 Pro - FPV RC Radio Drone Controller (78 builds)


RadioMaster TX16S Hall Gimbals Built-in USB-C Multi-Protocol Module Radio PRIORITY SHIPPING INCLUDED (82 builds)


FrSky Taranis Q X7 2.4GHz 16CH Transmitter (Black) (254 builds)


Fat Shark Attitude V4 FPV Goggles Anniversary Edition (20 builds)



HD Camera

RunCam 5 Orange

Video Receiver

ImmersionRC PowerPlay - FPV DVR (h264, 60fps)

Video Receiver

SpiroNet 5.8GHz 13dBi LZR Antenna (RHCP)

Video Receiver

TrueRC Singularity 5.8 SMA 90 Degree Long Antenna RHCP

Video Receiver

SINGULARITY 5.8 stubby - TrueRC Canada

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (182 builds)

Radio Module

TBS Crossfire Yagi 915mHz

Radio Module

TBS Crossfire TX - Long Range R/C Transmitter (5 builds)

Radio Module

True-MoX 915 |

Battery Charger

iSDT D2 Smart Balance Charger (11 builds)

Soldering Iron

TS100 PORTABLE SOLDERING IRON W/XT60 Power Cable (17 builds)


ETHIX Neck Strap (3 builds)


FrSky Vantac M4 4mm CNC Aluminum GRAND LOTUS Gimbal Stick Ends
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HK-AERIAL VTOL   Aug 07, 2019  

This is from a while back (your build), but I too fly a 4" on (both) those APC's and I have to say that this is one of the funnest combinations there is to fly. I do not have the 14XX Hyperlites, but I can see a 3-4" (why not 3/4" hybrid?) with them in my future. Maybe I'll save that for a winter build.

QU|(K_F0X   Feb 24, 2019  

Maybe you can get the gyro to work by changing the baud rate

Etolier   Feb 24, 2019 

I'll check it out, I had set everything up for the compass per manufacturer guidelines and other community known info

QU|(K_F0X   Feb 24, 2019  

What's the AUW with batt?

Etolier   Feb 24, 2019 


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