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Your not going to get nimbal and long flight time, why do you need the long flight time? If you just want the long flight time for fun, if so I'd just get a couple batteries and swap them out when you get low.

Flight time or just hover, and what all are you going to be lifting?

Never dealt with it, can you explain it to the Americans here (like me). https://www.dropshippers.com/

Could get 300k/v motors and size up the props, because a 900kv motor can handle 12'' well. Also note that the excalc does conservative estimates. How long are you looking to get?

Get some polarized antennas, rubber duckies (Dipole) are junk.

Haha, most all of these are coreless. They are actually cheaper to make this way.

Check that the motors are spinning the correct way, if not reverse any two wires on the 3-phase side.

Can you forward the emails to me at GJH105775@gmail.com ? Make sure to wipe them of any personal info.

Also higher voltage helps, but getting HV parts will NOT be cheap.

Higher voltage would make it a much better endurace quadcopter.

How long a flight time are you looking for and what do you plan to carry?

If you can get/make a light frame this may not be a problem, I would just plan the build for 4S, as it cost pretty much the same, just get ESCs and motors that are rated to handle 4s lipos. You may need to get 11'' props if your motors have enough torque to handle them. I am lifting 3...

The battery 25*1.3= 32.5 amps and 35*1.3=45.5 amps, all together your motors can draw up to 40 amps, so you seem to be fine if it hovers at ~30% throttle, if you fly REALLY aggressively it could become a problem Check your solder joints, you may have a cold joint giving you resistance.

Take a look at a sonar module.

While it is possible to make it control the runcam, or about any other camera, you'd either need an Arduino, or PWM switch.

I have been using the H frame design for a few different frames and can confirm that it is really nice, it has a lot more room than many other designs and can be built easy and cheap.

That is correct, as there are only 3 possible axis's in a 3D plain they are combining the two sensors to make their number 'bigger'.

You could get a runcam if your quad will lift it. it takes video, so just take the stills out of the video.

Looks great, I really like the design

I'd be interested in seeing some of your data, could you make a thread in experimentation? The batteries may be just a hair overcharged, but stopping them at 3.7v is a BIG help, many people run them to 3.0v and charge their LiPos fast; this really decreases the life span, and shortens future...