Tooth Fairy 4" - GPS HD 240g

By Etolier on Feb 24, 2019

11  241  4

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.

Photos

Part List

Frame

HyperLite Tooth Fairy 4" Race Frame 14xx Pattern (4 builds)
Pyrodrone.com
$25.99

Flight Controller

Talon F7 BB 20X20 Flight Controller
Pyrodrone.com
$32.99

ESCs

Aikon AK32PIN 4-in-1 35A 6S 20x20 (14 builds)
Pyrodrone.com
$59.00

Motors

4 x Hyperlite 1407-3600 Race Series
Pyrodrone.com
$63.96

Propellers

4x4E-3-B4 | APC Propellers
Apcprop.com
$5.48

Propellers

4x4.5E-B4 | APC Propellers
Apcprop.com
$4.96

FPV Camera

RunCam Split Mini 2 FPV / HD Camera M12 Lens (50 builds)
Pyrodrone.com
$62.99

FPV Transmitter

TBS UNIFY PRO32 NANO 5G8 (7 builds)
Pyrodrone.com
$29.95

Antenna

TrueRC Singularity U.FL 5.8Ghz Antenna (Short)
Airbladeuav.com
$19.99

Receiver

FRSKY R9 MINI 900MHZ LONG RANGE RECEIVER (2 builds)
Pyrodrone.com
$19.99

Batteries

Pyro-Drone Graphene 700mAh 4S 14.8V 75C By Who Cares!
Pyrodrone.com
$15.99

Radio

FrSky Taranis Q X7 2.4GHz 16CH Transmitter (Black) (96 builds)
Pyrodrone.com
$104.99

Goggles

Fat Shark Attitude V4 FPV Goggles Anniversary Edition (5 builds)
Getfpv.com
$349.99

Goggles

ETHIX GOGGLE STRAP
Pyrodrone.com
$15.95

Video Receiver

ORT New Helical 3 Turn Antenna Red
Team-blacksheep.com
$26.95

Video Receiver

ORT New Helical 3 Turn Antenna Red
Team-blacksheep.com
$26.95

Video Receiver

ImmersionRC rapidFIRE w/ Analog PLUS Goggle Receiver Module (19 builds)
Pyrodrone.com
$149.99

Radio Module

FrSky R9M Module (18 builds)
Pyrodrone.com
$49.99

Radio Module

True-MoX 915 |
Truerc.ca
$19.99

Accessories

ETHIX Neck Strap
Team-blacksheep.com
$6.99

Accessories

FrSky Vantac M4 4mm CNC Aluminum GRAND LOTUS Gimbal Stick Ends
Pyrodrone.com
$11.99
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Discussion

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QU|(K_F0X   29 days ago  

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

Etolier   29 days ago 

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

QU|(K_F0X   29 days ago  

What's the AUW with batt?

Etolier   29 days ago 

240g

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