I will go out again soon and do more photos, I have a feeling I am narrowing down the area. (my dji stuff are drones, my quads are quads, lol.) Reviewing the pics are home on the big monitor was like looking for a needle in a haystack. I took my Spark out the other day and started mapping the area with photos from the drone. The mrs and I went down the next morning in the cold with the rubber boots and (me) grumpy disposition and had a nominal look around and see how deep the water is, *sigh*. In my review thread of this FC I took a photo showing the placement of some parts being off - a QA environment that lets this pass would increase the likelihood of failure I reckon. The other one is AIO FC failure due to QA issues. I made sure that these solder joints were solid as large gauged wire + through PCB battery pads make for massive heat sinks so you have to really dial up the wattage of your soldering iron when bonding these joints. My suspicions are a possible battery cable failure due to large gauge wire being soldered onto the AIO. I performed a few punch-outs earlier in the video over land - I did notice the video went to crap at the peak of the punch out but that could just be down to video signal (quad up high, maybe my diversity RX was feeding off the directional antenna, etc). I've had issues in the past with bottom mount lipos disconnecting during a power loop or punch out with the physical sag causing the batt to disconnect - I don't believe it happened in this case as the throttle was only moderate and you can see in the video that the quad wasn't ascending too quickly. As soon as the video went out - that sweet sound of the four inch bi-blades just stopped. Whilst listening to the flight I could tell it was a loss of power that caused it.
Thanks guys, appreciate the yes mate that was my immediate reaction, was to throttle up. With all those LEDs it should be a bit easier to spot, but searching in the dark would give you the best opportunity, assuming the LiPo can keep powering the LEDs that long before it dies. Hopefully it ended up in the grass somewhere or in a tree. For an additional 1g of weight it's just another added insurance policy in case it ends up buried in some foliage. I know it's a bit late now but I always fit a proper buzzer to my quads, even my 1S whoops. When you lost video, did you pitch forward and throttle up to try and clear the water? If not then I fear that it's probably in the drink Looking at your build it also looks like you didn't have any type of buzzer fitted to it (?). Maybe one of the VTX wires came off a pad, or the antenna IPEX connector came off the VTX. You were over water too which isn't good. My worst nightmare is losing video feed because there is absolutely nothing you can do about it. I feel for you after all the work building it because it turned out really well
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