AOS 3.5 O3 6s sub 250g

By Jeremy257 on Mar 18, 2023

11  1,347  22

This AOS build is the best sub 250g I've flown when compared to my 5". A bit better than my 3" vista build was. Great for freestyle. Not much else to say. If you want a sub 250g freestyle, this thing rips on 6s. AUW 247g Betaflight 4.4, Bluejay 18.1.



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Madcatmike3d   23 hours ago  

Nice build!! So in your opinion, the 1604 is a decent 3.5" motor?? I was just looking at them today, but could not find enough info on them. I want to run them on a 6s 3.5" 2fiddy. What do you think?

LiPoFly   Mar 21, 2023  

Good build. What is the weight of the drone without battery?

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Jeremy257   21 days ago 

Ouch. There is only the weight restriction here in America. My AOS rips, especially if I use the 2.5" pitch props. Still no where near my Quadmula F5 split but it's pretty fast. I was very comfortable flying my 3" vista build aggressively through my neighborhood. I rarely fly the AOS in my neighborhood and usually walk about 5 minutes to a small park to fly it.

There is some pretty good info out there on de-casing the O3. I think it shaves at least 10g off the weight......

QuanDar   16 days ago 

I'm probly going to sell my current aos 3.5 and make a new one with the same motors as you. Wonder if you can make a video with using max throttle. Want to compare them to the rcinpower 1804 motors. I will upload a few videos to on my youtube channel and post them :). Your build is perfect, can even add foxeer gps with compass.

Jeremy257   16 days ago 

I'm actually in the middle of updating mine slightly. I'm switching the AIO for the Speedybee. I put a Speedybee stack on my 5" and i really like the built in wifi Bluetooth. Tuning in the field so easily is awesome and using their AIO only adds a gram to my build.
I'll finish before the weekend and get you some videos. i think you'll find that the T-motors are actually going to give you more thrust. kv is important and the T-motors have about 16% higher kv than those 1804 motors. The T-motors were made specifically for 3.5" freestyle builds whereas i believe those 1804s were made for cinawhoops.

Grizz   Apr 10, 2023  

I will assemble the model, but under the control of dji remote controller 2. And I cannot choose a flight controller, it is desirable that the speed controllers are mounted in the controller. can someone tell me??

Jeremy257   Apr 14, 2023 

Using an AIO (speed controllers mounted in the flight controller) reduces weight significantly. The motors used on a sub 250g build will not draw much current. The AIO handles it just fine. As you see, with the battery I am using I'm just a few grams under 250g. If you are not worried about that weight limit you could use a stack. GNB makes a 380mah 6S 90c battery which you could use to save weight there and use a stack to make the weight. I personally want as much amperage potential as I can get thus the largest 6S possible with the highest C rating. I have had no issues with the AIOs that I have put in my lightweight builds.

WoopWeep   Mar 27, 2023  

Have you had any issue with these motors? The shafts started spinning inside the bell on all 4 of my motors within about a week. I had a few normal crashes in grass and only one bell has a slight ding but I wouldn't expect the shaft to slip so easily.

Jeremy257   Mar 27, 2023 

interesting. I've had a few crashes but no real severe impacts yet. i have not experienced any issues with the motors. I've probably only got 25 packs on them. if i have issues I'll probably replace them with those 1804 rc inpower motors as they're just slightly heavier. I'm traveling for the next 3 weeks and the AOS is the only drone i took. fingers crossed.

DeyronUsa   Mar 21, 2023  

Ha, building the same, but with 1804, and 4s. mind sharing your cli, got the same GepRc 35amp, need the motors remapping. that flight controller is wacky inverted already. also GepRc said it was not good for 4.4, curious what you found that worms. thanks!

Jeremy257   Mar 22, 2023 

I just first flashed bluejay, now v19, (48 khz which is recommended by DJI for the O3) , then betaflight 4.4. I utilized the UAV Tech 3-4" preset on medium build quality with RPM filtering. Once you do this you'll need switch bidirectional dshot back on. I also used the 250hz ELRS preset. I've only got about 25 packs on it now. I need to do a little more refinement but it flies well. I'll message you my CLI.

Jeremy257   Mar 24, 2023 

I just looked into the 1804s. I found some RC Inpowers that are made for 6S that are only 12g with wires. Wow, wish I had realized. Still my T-motors with just the 3520 props I'm getting a 10:1 thrust to weight ratio. I definitely notice a boost using my 3525 props but it seems unnecessary.

antonio.krpina   Mar 19, 2023  

I found that for freestyle hqprops dont have inaf pitch and with all up weight around 250g strugle to pull out of dive. Defently sugest to try gemfan hurricane 3525 and emax avan 35

Jeremy257   Mar 19, 2023 

i have the HQ T3.5x2.5x3 props also. i haven't felt like i have had any issues with torque on the 2" pitch and I feel like they have more grip. Murders flies 3016 on his 240g build. it doesn't look like he's struggling. i like Gemfan props also but they are considerably heavier. Now that I've removed the BEC I've got the room to pick up a gram in props.

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