Daya H4 680

By cjdavies on Jun 25, 2018

15  1,661  14

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 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 (5 builds)


T-Motor MN3508 380kv (2 builds)


Multirotor Carbon Fiber T-Style Propeller 14x5.5 Black (CW/CCW) (2pcs)

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 (5 builds)


Menace Raptor 5.8Ghz Stubby Antenna (SMA) (RHCP) (14 builds)


Frsky R9 MM 4/16CH 900MHz Long Range Telemetry Receiver with an Inverted S.Port Output (16 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)


FrSky Taranis X9D Plus 2.4GHz ACCST Radio & X8R Combo w/ case (Mode 2) (42 builds)


FatShark Attitude V2 FPV Headset System w/Trinity Head Tracker and CMOS Camera
See Site

HD Camera

GoPro HERO4 Session Video Camera GPCHDHS-102

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)

Misc Parts

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

Misc Parts

Strobon V2 Navigation Strobe Light​ (White/Red/Green/Blue) (2 builds)
See Site

Video Receiver

Aomway DIV006 V4 DVR 5.8G 64CH Raceband FPV Receiver Built-in DVR w/ Auto Save Function
See Site

Radio Module

FrSky R9M 900MHz Long Range Transmitter Module for FrSky R9 Series (54 builds)

Soldering Iron

Hakko FX888D-23BY Digital Soldering Station FX-888D FX-888 (blue & yellow) (19 builds)
Show stores (14)


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sivads   Mar 14, 2019  

Great build! Thanks for the detailed photos and info. I've started my build based on the same frame. The arms are two different lengths. I think the shorter arms are supposed to go on the rear where the connection point is about 1" longer than the front (so all arms will effectively be the same length). That way, all arms are the same distance from the center point of the frame. Some pictures from the manufacturer have the short arms on the front and some have the shrot arms on the rear. I guess ultimately it doesn't really matter because the frame folds with either configuration and it depends on where you locate the center of gravity. But, if you want the arms to be the same length from the center, the long arms should be on the front (shorter frame front) and the short arms should be on the back (longer frame rear).

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sivads   Mar 25, 2019 

Was a shocker to me too — I had mine all put together before I noticed! I haven’t test flown mine yet (waiting on parts), but I wanted to thank you again for sharing your build. It has helped me a lot! I’ll post my work after I’m all finished and it has made it past the maiden flight. Cheers!

cjdavies   Mar 25, 2019 

Glad to hear it helped you, that's precisely why I try to post things like this :)

sivads   Jun 15, 2019 

I finally posted my build ( and have made it past the maiden. It flies great!! Thanks again for sharing your build -- it really helped.

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.

BmoreDroneService   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 ;)

BmoreDroneService   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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