AOS 3.5 V5 6S

By RedFrog on Mar 23, 2024

5  0  6

My first build :)

I really enjoyed the building process - so much so I just ordered a 5" frame to have a go at the supposed best in class size wise

I only flew tiny whoops till now and also loads of sim time so was looking for my next step up - I got hold on some T-Motor AIO and 6S 1604 motors on offer so decided to have a go at building my first drone - using nothing else but the brand new AOS 3.5 V5 frame.

Original plan was to go for a Walksnail Avatar Pro VTX - but when all put together with the TPU parts that came witht the frame I got to 194g so a rethink was needed as I want to be able to keep it as a sub250 to sometimes fly in urban parks.

Decided to go for a Nano v3 instead to shave nearly 15g (also allows to get rid of a BEC as the T-motor AIO only offers 3.3V & 5V)
Also found out that you do not need per say the 'heavy' tpu mounts for the antennas so followed the advice and tied them to the arms

Next assembly I realised the nano v3 vtx is using M3 for the 20x20 mounts - so frame would need drilling in quite a few places to accomodate...
Also center of gravity was always too far back once the battery was on - and this meant ditching the xt30 holder to move the battery forward. I was already kind of committed to the xt30 holder as used to support the capacitor assembly so decision needed...

Last ditch at reviewing other mounting options and realised that by putting the vtx at the bottom of the stack using the 25.5x25.5 mounts - with some nylock golden nuts and then the AIO on gromets on top would just fit and still provide plenty of aiflow (gap is 6-8mm). Just needs adding a TPU 'strap shield' attached to the stand offs to allow to all fit nicely using the 20mm stack screws. Putting it all in the middle helps with weight as shorter motor cables and also move the center of gravity towards the front.

Now the weight is down to 164.3g without battery - or just over 250g with a 550MaH Tattu battery (the smallest 6s I have)

I want to add a skid plate and some arm protectors so sub250 would mean a 450mAh battery (just ordered a couple)

With those extra TPU bits on and a 650mAh battery - the drone is 283.4g and now nicely balanced -- this will likely be my go to config when I fly out of town.

Shout out to Joshua Bardwell, Oscar Liang and Chris Rosser for infectiously sharing their passion - I feel I am embarquing on a very special journey :)

Also Lee (3daqua on ebay UK) - ready to 3d print anything - very good quality / price / turnaround

Will post flight times with the different battery config as soon as the British weather calms down a bit -- for now, back to practising with my suddenly very boring whoop ;)

Update 08/05/2024 -- been flying it quite a lot in the last few weeks and this thing is a beast tbh. I have also just completed a 5" version and jumping onto it did not feel that much of a step up - a testament to how powerful this 3.5" is! Had a few issues with video transmission but new antennas and moving the vtx one in a more vertical position did solve those (mounting on the arm really impacted the range and penetration in my tests - so now antenna is cable tied to one of the rear standoff). Downside of all this power is flight time though - I get 3mn30 of energetic flying on a 550mAh (right on the 250g mark) and 4:30mn on the 650mAh. If cruising, times are quite a bit longer - I reached 8mn on the 650 without problems. I also seem to slightly prefer the 3520 props to the 3525 I originally chose. Close call though. If I was to rebuild it now - only thing I would change is to for the new mini vtx - identical to the nano but decased - should shave another 10g all together and allows a bit more TPU protection while keeping sub 250 with the 550mAh battery.

Photos

Discussion

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jares13   May 03, 2024  

Hello! I going to make similar drone on same frame. Now I have hard choose between t-motors 1404 and 1604 for 3520 props. What do you think about this chose? And I am not so faster pilot))

RedFrog   May 03, 2024 

I really like the extra power of the 1604 - but weight is really tight if you want to stay below 250g. If you like freestyle/acrobatics, I would stick with the 1604 - and also consider using the new Lite VTX from Walksnail - same as the nano but without the case to save 7g.

jares13   May 03, 2024 

I'm not chasing 250g. I planning use some more size battery and be in 300g. But yes, I think 1604 will be better) And I can limit throttle if I will understand 1604 has alot of power)) Thank you!

BigDan1190   Apr 10, 2024  

Hi, please can I ask why you chose to put the VTX on the bottom rather than the FC? Usually FC is mounted first and VTX on top. Cheers, Dan

RedFrog   Apr 10, 2024 

Hi, if you put the FC at the bottom you have no way to secure the stack screws against the frame to stop vibrations as you are tightening against the grommets of the FC and there is no space for another set of nuts with the 20mm stack screws - and not much space left anyway when you add the strap in. The case of the VTX is a hard shell so I could tighten against that and then have solid stack screws with the FC's grommets working as expected on top.

BigDan1190   Apr 12, 2024 

Ok thank you. My build is going to be analogue for now and then upgrade to the V3 nano in a month or 2 so I wanted to know if i needed to leave slack for the cables or not incase the FC needed to go on top. Cheers for your quick answer.

RedFrog   Apr 10, 2024  

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