Sub 250 3" Apex mini with DJI O3

By D4N13L on Jun 08, 2023

5 92 4

Hi there,
i got hyped for building my own drone after buying the Avata. It is a nice drone but i want to go more into freestyle.
My target was to build a 3 inch, sub 250 fpv but compatible with my DJI Goggles Integra and DJI FPV Remote 2.

Some Information:
This frame combined with the O3 air unit only allows a maximum camera angle of around 30°. The metal pins are blocking a more agressive angle.
The props are ok for a beginner like me and with default betaflight settings. In the future, i definately need some with a higher pitch for faster response.
The overall weight is 256g :-(
Flight time (cruising on higher altitude, with some powerloops, flips and a little wind) is around 8 min.

It war a lot of fun to build it and it will not be the last one for sure.
Thanks for all the inspiration i found on rotorbuilds.com!

Photos

Part List

Frame	APEX Mini 3 Zoll 150mm Carbon Faser Rahmen Kit mit 4MM Dicke Arme Für FPV Freestyle RC Racing drone Quadcopters De.aliexpress.com	$6.00
Flight Controller	F411 Mini HD + KO25 BLHeli_S Stack By Skystars Drone-fpv-racer.com	See Site
Motors	4 x Emax ECO Micro Series 1404 - 3700KV Brushless Motor Drone-fpv-racer.com	See Site
Propellers	HQProp Durable T3X1.8X3 PC - 1.5mm (2CW+2CCW) Drone-fpv-racer.com	See Site
FPV Camera	DJI O3 Air Unit (4 builds) Store.dji.com	See Site
Batteries	Tattu 4S 850mAh 75C Lipo Battery (XT30) (3 builds) Drone-fpv-racer.com	See Site

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Discussion

uomobionico Sep 18, 2023

hi, very nice build.
how did you secure the O3 to the frame?
did you double tape glue it ?
do you have any videos on how it flies ?
thanks

D4N13L Sep 18, 2023

Hi.
thank you very much
I double tape glued (
https://www.amazon.de/Pattex-Kleben-Montage-Klebeband-superstark/dp/B000S6799Q/ref=asc_df_B000S6799Q/?tag=googshopde-21&linkCode=df0&hvadid=220390738279&hvpos=&hvnetw=g&hvrand=7442827016957395717&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9042255&hvtargid=pla-422901847381&psc=1&th=1&psc=1
) it and used a zip tie as well.
Sorry but I have not recorded a video how it flies so far. But it flies like a charm and is very durable as well. Flew against a couple of trees and a excravator without damaging more than the props.

uomobionico Sep 18, 2023

thanks so much for prompt response.
hopefully soon I will replicate your build.
would it be possible to have a picture to see how far the O3 ends up inside the frame towards the FC/ESC and at the back towards the spacers

D4N13L Sep 18, 2023

sure here you go
the o3 unit is all the way in the back and touching the spacers
between o3 unit and FC/ESC stack there are 1,5cm space only.

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