Daya H4 680

By cjdavies on Jun 25, 2018

12  952  9

Rebuilding my Tarot 650 Sport onto the better designed Daya H4 680 frame, upgrading to FrSky R9 & adding OSD at the same time. Servo dropper for mid-air miniquad launches ;)


Part List


DAYA-680 New Coming 3K Carbon Frame

Flight Controller

Pixhawk PX4 2.4.8 Flight Controller NEO-M8N GPS Radio Telemetry OSD 3DR 915Mhz (3 builds)


4 x Hobbywing XRotor 40A ESC 2-6S (2 builds)


T-Motor MN3508 380kv (2 builds)
See Site


13x5.5MR | APC Propellers

FPV Camera

RunCam SKYPLUS (10 builds)

FPV Transmitter

AKK X2 5.8Ghz 0.01mW/25mW/200mW/500mW/800mW Switchable FPV Transmitter Compatible with Betaflight OSD FC (3 builds)


Menace Raptor 5.8Ghz Stubby Antenna (SMA) (RHCP) (10 builds)
See Site


FrSky R9 900MHz 16CH Long Range Receiver & R9M Module System (3 builds)


Turnigy Graphene 4000mAh 6S 45C Lipo Pack w/XT90 (2 builds)

Power Distribution

Matek FCHUB-A W / CURRENT SENSOR 120A & 200A RANGE, NO BEC (4 builds)
See Site


FrSky Taranis X9D Plus 2.4GHz ACCST Radio & X8R Combo w/ case (Mode 2) (58 builds)

Misc Parts

Servo Parabolic Switch Device Aerial Vehicle Throwing Device

Misc Parts

Pololu 5V, 2.5A Step-Down Voltage Regulator D24V22F5

Misc Parts

Micro OSD v2.3 (AB7456)
See Site

Misc Parts

Pololu 12V Step-Up/Step-Down Voltage Regulator S18V20F12

Misc Parts

Strobon V2 Navigation Strobe Light​ (White/Red/Green/Blue)
See Site
Show stores (13)


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rolyteamfly   Aug 13, 2018  

Hey, I'm thinking of a similar build - any reason why I couldn't use the more modern 40A ESC that are more readily available for race quads? Thanks!

cjdavies   Aug 13, 2018 

The only reason I used the ancient massive HobbyWing ESCs is because they're renowned in the Ardupilot community for being absolutely bulletproof for large, low kv, high stator count motors. I don't know how much desyncs on larger/slower motors are still an issue with certain ESCs & whether modern blheli32 race quad ESCs would handle them fine, but I'd wager they'd be fine now we're not all running SimonK anymore... Ironically the HobbyWings do actually run a (specially modified) version of SimonK :3

Amethyst FPV   Aug 08, 2018  

Nice build! I would reccomend upgrading the stock R9 tx antenna to a diamond.

Portland_Pilot_88   Jun 27, 2018  

wow was that carbon gunk inside the arms?? maybe i need to take mine apart and clean my arms out!

cjdavies   Jun 27, 2018 

Yup, arms were full of dust & the carbon plates were probably the sharpest edges I've ever seen on a frame! Spent the first evening of the build juat filing, sanding & washing.

Hollywood_FPV   Jun 26, 2018  

Wow you beat me to it....I'm in the process of building on a DJI f450 flamewheel. I'm building a "recovery," quad to retrieve minis that are stuck in trees or crashed on a rooftop. Your mid air release system is pretty sweet, id love to see it in action!.... Nice build man.

cjdavies   Jun 26, 2018 

With any luck I'll get it in the air this weekend with a willing test pilot to drop ;)

Hollywood_FPV   Jun 26, 2018 

Where are you located brother?
Id let you drop me any time... I spin when armed so I guess id have to arm after you drop me so I dont hit the servo? Kinda curious to see this work lol. Unfortunately I'm in Maryland where fpv scene seems to be pretty lame...or I just have no friends, not sure. Lol.

cjdavies   Jun 26, 2018 

I'm in Scotland, so it'd be a bit of a trek :p And yeah, this is going to be a strictly 'arm after drop' arrangement, after double checking & triple checking that betaflight's 'arm at any angle' is working!

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