Sky Hero 4" agile racer

By geoffmunn on Jan 10, 2017

0 22  0 

I wanted to build a fast quadcopter, but couldn't decide on the frame size, so I bought 3 Sky Hero OB1 frames - a 4", a 5" and a 6" frame.
They'll all run exactly the same components, except for the 4" frame which will have different motors.

This is the build list for the 4" frame, and is my first custom build quadcopter.

This was a challenging build in some aspects - there is very little room on a 4" frame and some of the soldering was very fiddly.
The Brain RE1 flight controller is really nice though (the autotune function is really cool), and the 32bit ESCs work well although there is no documentation on the web. I didn't flash them - they work straight out of the box.

I used the Spektrum receiver because I have a DX8. This receiver does not integrate well with the Brain RE1, and the telemetry options are unavailable so I have to rely on the OSD in the goggles to tell me what's happening.

Once the dRonin autotune process was completed then it became very stable and is heaps of fun to fly. It's very nimble and you can throw it around.

Photos and video to come soon.

Part List


OB1 Naked Frame 4" REV2 (PDB included)

Flight Controller

RE1 Flight Controller - BrainFPV
See Site


4 x Lumenier 30A 32bit Silk ESC OPTO (2-4s) (3 builds)


4 x RCX 2205 2950Kv 3-4S Brushless Motor V2


DAL Prop 4045 Bullnose 4 Pack

FPV Camera

Foxeer Arrow V2 FPV Camera, Built in OSD and Microphone

FPV Transmitter

TBS Unify Pro 5.8Ghz Video Transmitter


IBCrazy 5.8 GHz RHCP Dura-Spec Antenna


Spektrum Quad Race Serial Receiver w/telemetry (2 builds)


R-Line 1550mah 14.8v 95C Lipo

Power Distribution

mPB - brainfpv
See Site
Show stores (6)


Sign in to comment.

Gear Reviews

2 526 
By Whiffles 26 days ago

The EV100 Micro AV Recorder is a DVR for the Eachine EV100 headset. Eachine should have built this into the headset, but here we are. It's about the size of a matchbook and works quite well despite a short learning curve. It's powered by the same battery included with the EV100 and uses the white balance lead. Other than that you can use either of the included 2.5mm to 3.5mm cables to plug it into the video input/output port of the EV100. You can either strap it beside the battery in the headstrap or use the included double sided tape to mount it to the top of the goggles. Vs the Eachine ProDVR This is obviously a repurposed Eachine ProDVR, but it does simplify the design. The ProDVR has different pins for each input and output. In fact the entire side of the unit is dedicated to various keep reading..

9 1,998 
By Whiffles Sep 29, 2017

Currently on sale for $97, EV100 at Banggood The much anticipated Eachine EV100 headset has finally arrived! Opinions have been quite polarized and unless you've never flown FPV before you're likely to find fault in the field of view (FOV). I've tried a number of headsets and have to admit that I've been spoiled by the FatShark HD2 and HD3 goggles. That being said this is nowhere near that price bracket, so I'd like to compare the EV100 to a few headsets around the same price. Keep in mind that these cost $100 when they were released, so the current $159 price is likely to come down. EV100 vs the Competition I've been a long supporter of the Eachine EV800. It's a great headset for the price (~$55). Feature for feature it's the most comparable headset to the EV100. Both include a keep reading..

Are you sure you want to unfollow this person?
Are you sure you want to delete this?
Click "Unsubscribe" to stop receiving notices pertaining to this post.
Click "Subscribe" to resume notices pertaining to this post.