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May 10, 2017, 02:08 PM
silently addicted..
muteFPV's Avatar
Thread OP
Build Log

Ultralight "MicroGP" 1S brushed quad


When talking about fast, nimble and enjoyable micro quads, your mind will most probably go straight to 2S, 3S or even 4S builds, with screamingly high KV motors and expensive gear.

Inspired by the recent introduction of the Micro Class in the MultiGP leagues, I started planning out for a lightweight brushed build, strictly based on 1S batteries and composed of easily found hardware. I am a fan of micros and wanted to see how "good" a 1S quad can be in the air.

The must haves were the following:
  • Frame: small footprint, compatible with 65mm props
  • Motors: cheap, powerful and reliable
  • F/C: all-in-one, including receiver and OSD
  • VTx: switchable from 25mW to 200mW

The weight goal was initially 36,5 grams and required some tricks to reach.
After various combinations and several test builds, I finally assembled the most enjoyable of them all, that ticks all checkboxes and survives some crashes as well.
Starting at 36,3 grams (dry) and according to my motor/prop static thrust tests, this build has a power to weight ratio of 3,39:1 (using 300mah nanotech 1S batteries).
With a few touches here and there it easily drops down to 35,5 grams (dry), with a 3,45:1 power to weight ratio!
And if you opt for a light 25mW AiO FPV combo instead of the 600TVL board camera and the switchable VTx, you can easily exceed 3,5:1 power to weight ratio..

These numbers may not seem much, especially when compared to powerful 3" and 4" builds.
But the miniscule weight and size, combined with the convenience of 1S batteries, make for an extremely enjoyable and fast micro brushed quad.

You can watch the build log video here:
BUILD LOG: Ultralight "MicroGP" 1S brushed quad (MultiGP Micro Class build) (6 min 39 sec)

...or check the screengrabs below.


Parts list (and some alternatives):

MI110 frame: https://goo.gl/aXb6Pk or https://goo.gl/EKUCrF or https://goo.gl/pYLqNw

AIOF3_Brushed flight controller: https://goo.gl/UGVcu2
(alternative #1) AIOF3PRO_Brushed flight controller: https://goo.gl/2xvjt8
(alternative #2) Aurora RC JHF3 V1.0 F3 brushed flight controller: https://goo.gl/Wspkr9

RACERSTAR 8520 motors (set of 4 in black): https://goo.gl/JrWJOS
RACERSTAR 8520 motors (set of 4 in red): https://goo.gl/tfuYY1 or https://goo.gl/EQfSu6

KINGKONG 65mm propellers (10 pairs in black or red): https://goo.gl/eom0tW or https://goo.gl/FbyIwG

VTX03 Switchable 25/50/200mW: https://goo.gl/Am23jQ or https://goo.gl/0oGKvw
(alternative #1) VTX01 25mW: https://goo.gl/oBAqI2 or https://goo.gl/O5bXZP
(alternative #2) VTX02 200mW: https://goo.gl/EcQHKj or https://goo.gl/3YF9yc
(alternative #3) ATX03 25/50/200mW with audio: https://goo.gl/lW4SQA

600TVL CMOS camera: https://goo.gl/kLw4Y0 or https://goo.gl/Li4Wcc or https://goo.gl/6IO5Yz
(alternative #1) 700TVL CMOS camera: https://goo.gl/DXu4P7 or https://goo.gl/1bXkQT
(alternative #2) 1000TVL CMOS camera: https://goo.gl/M8JnFk or https://goo.gl/Wns4vY or https://goo.gl/MGNz5z

Adhesive 9.5mm 3:1 heat shrink: https://goo.gl/HoJCLb or https://goo.gl/XIVFHC

Convenient heat shrink 2:1 basic kit: https://goo.gl/vpDt6u


If you are wondering about the tools, you can find them here:


Enjoy!
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May 10, 2017, 04:19 PM
Registered User
Cesco's Avatar
Good build video, thanks.

My questions:
The heatshrink motor mount is to save weight?
You use racestar motors. Are they better than chaoli ?
You use a $30 FC. Why not the $9 acro naze? Is there a difference in flight performance?

The cheapo FC: https://www.banggood.com/Eachine-32b...p-1076529.html
May 10, 2017, 04:44 PM
silently addicted..
muteFPV's Avatar
Thread OP
Quote:
Originally Posted by Cesco
Good build video, thanks.

My questions:
The heatshrink motor mount is to save weight?
You use racestar motors. Are they better than chaoli ?
You use a $30 FC. Why not the $9 acro naze? Is there a difference in flight performance?

The cheapo FC: https://www.banggood.com/Eachine-32b...p-1076529.html
Thank you Cesco.

Yes, the heatshrink mount is to save weight. It is a significant difference but less crash resistant. Also if you run worn motors that run hot, there is a possibility that the adhesive on the heatshrink will soften and loosen as a mount temporarily.

You can give my Racerstar 8520 vs Chaoli 820 comparison video a look.

As for the F/C, it is all about the total weight. The AIOF3 combines a brushed F/C, a (betaflight compatible) OSD and an Rx. I prefer to pay more and save weight but you can use anything you want. These build logs are mostly intended to inspire and give ideas, than just follow blindly
May 10, 2017, 05:10 PM
Engineering.
John_Edward's Avatar
I watched your video and the only thing in my mind the whole time was "Can anyone create a micro that is more fragile than this thing?"
Still, the video and build were great, and it flies like a pocket rocket.

I just wouldn't want to fly this thing as I would break it in the first minute or so

Quote:
Originally Posted by Cesco
You use a $30 FC. Why not the $9 acro naze? Is there a difference in flight performance?
Quote:
Originally Posted by muteFPV
As for the F/C, it is all about the total weight. The AIOF3 combines a brushed F/C, a (betaflight compatible) OSD and an Rx. I prefer to pay more and save weight but you can use anything you want. These build logs are mostly intended to inspire and give ideas, than just follow blindly
The integrated RX models are actually cheaper, as the tiny FrSky recievers are around $8-10, while you can get the non-OSD FrSky FC for $15.
And there isn't a small external OSD you could add to these either.
Even if you get the FC with OSD for $16, you would need to add $8-10 for an FrSky RX, so you don't save much.

Now the real question is why the hell is the FrSky non-OSD Beecore $28.
(The answer of which is 'because whoops are popular and it's still a lot cheaper than the competition', btw)
May 10, 2017, 05:52 PM
silently addicted..
muteFPV's Avatar
Thread OP
Quote:
Originally Posted by John_Edward
I watched your video and the only thing in my mind the whole time was "Can anyone create a micro that is more fragile than this thing?"
Still, the video and build were great, and it flies like a pocket rocket.

I just wouldn't want to fly this thing as I would break it in the first minute or so
Trust me, it had taken a lot of beating. I had been flying it in many variations for testing before I ended up with what you saw in the video and all these weeks it survived many crashes
I will re-purpose the frame in a more crash resistant variant sometime soon, with a sleek rollbar and larger batteries.
May 11, 2017, 12:24 AM
Fan of just about anything RC
SoloProFan's Avatar
Nice project. Looking forward to seeing the "ultra durable" version.
Latest blog entry: For the love of the hobby!
May 11, 2017, 05:07 AM
silently addicted..
muteFPV's Avatar
Thread OP
Quote:
Originally Posted by SoloProFan
Nice project. Looking forward to seeing the "ultra durable" version.
Thank you solo.
It will definitely be heavier but I have a nice idea for the rollbar and the landing "gear" that will look great on this frame.
Jul 13, 2017, 02:32 PM
Registered User
great build. one question, this FC Aurora RC JHF3 V1.0 F3 brushed flight controller: https://goo.gl/Wspkr9 , do i still need receiver for spektrum dsm2 radio ( my old trusty dx7)? and how do i bind the two? sorry for the newbie question.
Jul 13, 2017, 03:30 PM
silently addicted..
muteFPV's Avatar
Thread OP
Quote:
Originally Posted by bigtruck169
great build. one question, this FC Aurora RC JHF3 V1.0 F3 brushed flight controller: https://goo.gl/Wspkr9 , do i still need receiver for spektrum dsm2 radio ( my old trusty dx7)? and how do i bind the two? sorry for the newbie question.
Hi bigtruck169, thank you.
The Aurora board has a built in FrSky receiver. You can select a different board that has a DSM Rx built-in.

I do not know details about binding a Spektrum Tx but you will definitely find the way in the product manual or here on RCGroups. I am only using FrSky but I am aware that you may have to follow a different procedure in order to bind Spektrum.


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