Hey there. I'm new here and new also with FPV drone (DIY). I have been piloting dji mini2, mini3 pro and avata. As I have the DJI ecosystem, probably I started incorrectly.

I started ordering the DJI O3 Air unit to use with my existing goggles and control, and I tried to find a FC and ESC for that. I did a lot of research and decided order a Mamba F722 AP with a ESC 50A.

I tried to use a custom frame (Avata like project), but the FC space was tight and I needed a smaller FC. I ordered a Mamba F722 Mini 40A ESC (unique model). I could fit the FC and the DJI O3, but the weight with battery is getting 300 to 350g (due to the main frame and avata frames). I have plans to use my 4S battery, and the motors I have handy - 1404 xing motors 4600KV 4S (with 16.25A peak - just learned later). 

concern: this motor has peak 16.25A and my Mamba ESC stack is 40A.

I know that Mamba are not cheap ones but I tried the easiest interface and compatibility and use my DJI ecosystem (maybe the first mistake).

I contacted Mamba support asking about their recommendation for motors and max weight, the tech guys are really bad and they just answered that I can't have a drone bigger than 250g (as I told, my drone is around 350g).

 I really would like to use the following, at least:
- Mamba F722 Mini + ESC 40A (20mm x 20mm)
- DJI O3 Air unit (vtx, receiver) with 25,5 x 25,5mm

I just ordered an OddityRC XI25 frame (fits FC with 20x20mm and also O3), but looks the internal height looks not to fit all in the center and I'm thinking about use a small extensor to allow that.

I have others items handy:
- iflight Xing 1404 4600kv
- Propellers D63 x 3
- Lipo 4S - with 100g (preferred)
- Lipo 6S - with 200g


I'm really lost if I can try this new frame and customize it, but my question now is on the motors. Which would be the maxium peak allowed for a ESC 40A (45A burst 10s), considering 4 motors.

Tks so much!

My main Now I have a Mini FC (20mmx20mm), really hard to find frames with this

It will be interesting to hear what people say but with 4600Kv motors you probably should not use 6s packs, you can always restrict the throttle input as a percentage in Betaflight, and you can run very low pitch props on your 1404 motors. You can run 3 or 4s packs. This will limit your amp draw and if you have the 40A ESC and it is the only thing that fits this might be a safe way to try it. If it flies well that's a win.

FWIW a friend of mine came to the field with a Baby Ape BNF today, 1504 2300kv motors 3.5" props. He told me it was almost uncontrollable. He was using 6s 850 mah packs with it which seemed about right for that kv. Anyway I gave him one of my 4s 850 mAh packs to try and he was thrilled. It flew great and very smoothly, easy for him to control. Certainly an easier fix than learning how to tune PID's! So my point is it might work, LOL. Wait for the experts to chime in but I'm guessing 40A is enough for 1404 motors.

(31-Mar-2024, 01:07 AM)husafreak Wrote: It will be interesting to hear what people say but with 4600Kv motors you probably should not use 6s packs, you can always restrict the throttle input as a percentage in Betaflight, and you can run very low pitch props on your 1404 motors. You can run 3 or 4s packs. This will limit your amp draw and if you have the 40A ESC and it is the only thing that fits this might be a safe way to try it. If it flies well that's a win.

FWIW a friend of mine came to the field with a Baby Ape BNF today, 1504 2300kv motors 3.5" props. He told me it was almost uncontrollable. He was using 6s 850 mah packs with it which seemed about right for that kv. Anyway I gave him one of my 4s 850 mAh packs to try and he was thrilled. It flew great and very smoothly, easy for him to control. Certainly an easier fix than learning how to tune PID's! So my point is it might work, LOL. Wait for the experts to chime in but I'm guessing 40A is enough for 1404 motors.

Husafreak, tks for your feedback! Most curious part is... Mamba puts at the marked a FC+ESC mini but recommended for less than 250g, but they use the "market" piece to use the DJI O3 air unit which has more than 40g and of course the risk to pass the 250g is really high.
Tks!

Yeah, it's a quiet night but I wanted to welcome you to the forum. I get sooo much help here when I need it, you will too.

The amp rating on most 4-in-1 ESCs is for each channel. So that is a 4x40A ESC, and if your motors max out at 16 amps, you should have plenty of headroom. Also 1404 motors running 2.5 props are not likely to pull that many amps in flight, typically they are pretty efficient, but maybe if you are running 5-bladed props and carrying a lot of weight.
4600kv should be good for 4S, but if you want to run 6S, make sure all your components support this (FC/ESC/motors). You would also want to run the O3 off a BEC if your FC has one, as 6S has some powerful voltage spikes that could be damaging. I don't believe the Xings will support 6S, I don't believe most 1404s would. You can set motor limits if you really wanted to try and didn't mind risking the motors, but probably not recommended.
With the O3's weight, you might want slightly larger motors if you plan to do more aggressive flying, but if you already have the 1404s you could try them out and see if you like them.

(31-Mar-2024, 03:36 AM)mstc Wrote: The amp rating on most 4-in-1 ESCs is for each channel. So that is a 4x40A ESC, and if your motors max out at 16 amps, you should have plenty of headroom. Also 1404 motors running 2.5 props are not likely to pull that many amps in flight, typically they are pretty efficient, but maybe if you are running 5-bladed props and carrying a lot of weight.
4600kv should be good for 4S, but if you want to run 6S, make sure all your components support this (FC/ESC/motors). You would also want to run the O3 off a BEC if your FC has one, as 6S has some powerful voltage spikes that could be damaging. I don't believe the Xings will support 6S, I don't believe most 1404s would. You can set motor limits if you really wanted to try and didn't mind risking the motors, but probably not recommended.
With the O3's weight, you might want slightly larger motors if you plan to do more aggressive flying, but if you already have the 1404s you could try them out and see if you like them.

Hey guys, tks so much for your help. I'm very excited and I'll get back when I make it work! I was very upset when I got this misunderstanding and I was thinking that everything was lost. It's almost ready and I just need to connect the gps, buzzer and make it fly. of course I'll try some simulator before, just in case. Tks again and have a great sunday and week.