Wind Junkie
lvl.4
Flight distance : 116165 ft
United States
Offline
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Hello everyone,
I've been intimidated of flying my Mavic indoors but after watching enough folks on YouTube fly it like a charm inside, I went ahead and gave it a go in my family room earlier tonight.
Preflight everything looked good, no warnings or prompts other than weak GPS signal hence atti mode. I launched to a hover at 4 feet, looked down at my phone screen, then looked up a moment later and saw the drone drifting slowly backwards toward a wall. I panicked and flicked the left stick up which ascended the Mavic another foot, but by the time I moved the right stick forward (in effort to steer the drone forward and away from the wall), the rear props struck the wall and ran the drone into a table. In checking the logs post-flight, I can confirm there was no joystick input other than what I did to ascend. No damage to the drone or gimbal took place thankfully, but the rear two props took some chips and scuffs (luckily the factory box comes with two spares, thank you DJI!)
I read in the user manual looking for information as to why this may have occured and believe I came to an accurate conclusion - the downward vision system was unable to fly the drone stable in place, causing the slow drift to occur. Page 25 clearly states, "Operate the aircraft with great caution in the following situations" ...read down the list... "Flying over extremely dark surfaces (lux < 10)." The only light in the room was a dim lamp 15 feet away. I actually downloaded a lux measurement tool to my iPhone and it didn't measure ANY lux over the surface where I launched and the drifting occurred.
In summary, if you are going to fly indoors, make sure there is very good light. Otherwise, be prepared to handle drifting. If I would have been more prepared, I could have been ready to steer the mavic as the drift was relatviely slow. I just wasn't prepared plain and simple. I got away with this bonehead move, but hope everyone can learn from my mistake.
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