Marabou Stork: Depron airplanes do not last long

Marabou Stork, my Depron FPV airplane had a bad luck. Few weeks ago, when I was testing development version of INAV, it crashed during take off. Poor accelerometer calibration combined with a software bug resulted in heavy roll 2 meters above ground. As a result, whole front section was smashed. Everything else more less survived. Luckily, winter is coming, flying season is more less over. I have few month to rebuild the nose and glue it back into place. With some extra reinforcements.

marabou stork crash 2

marabou stork crash

While Marabou Stork awaits new nose, I still have some footage to show…

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Air Crash Investigation: gone in 6 seconds

“What goes up, must come down”. I had an opportunity to face this old truth 2 weeks ago, when my 600mm quadcopter felt from 30 meters straight into water.

It was supposed to be a simple flight:

  1. take off
  2. fly few hundred meters away with GPS assist
  3. engage Return To Home and land

Dozens of missions like this in last few months, so really, nothing special. Unfortunately, like I mentioned above, not everything went as planned. 2 minutes after take off, UAV lost stability and went down with screaming motors. Continue reading “Air Crash Investigation: gone in 6 seconds” »

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Flips: rule number one

Rule number one when doing flips with multirotor (quadcopter) drone is to watch your altitude. Specially with bigger machines without big thrust to weight ratio. If you will not control altitude, it might end like that:

Quadcopter (built on Raptile 500 frame and Flip32+ FC) survived without a scratch. Camera (RunCam HD) survived as well. It “only” detached for quadcopter and traveled few meters by itself until landed in grass.

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Turnigy MT2213 935KV bearing replacement

Hitting the ground with a drone is not healthy. For pilot’s self esteem and UAV both. Specially when impact’s force will be taken by one of the motors. Most probably it will survive, they are quite tough little devices, but delicate bearing will take  punishment and might wear off. Luckilly, signals of damaged bearings are easy to notice: motor starts to make strange noises and you can hear oscillations during maneuvers. At this point you have two options: replace whole motor, or replace bearings.

I faced this situation last weekend when one of my MT2213 935KV BLDC motors stated to rattle in flight. It was very hard to notice in hover, but audible in turns. So I had no other option and decided to replace damaged bearings. Continue reading “Turnigy MT2213 935KV bearing replacement” »

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Drone crash: it happens

Crashes when flying any RC gear happens. And lower the entry level, more crashes we can see. Like, for example, those two “hard landings” I had few weeks ago.

First one is 100% pilot’s fault. I’ve got lost with FPV gear, lost sense of altitude and just hit that small tree trying to recover. Quad survived almost without a scratch.

Second one is a hardware fault and a proof that electronic components are sensitive to water. BEC got wet during rain and stopped to provide constant voltage. As a result, flight controller, OpenPilot CC3D in this case, was reseting itself on random basis. Result? Uncontrolled and rapid descend. This time quadcopter had taken some damage: broken landing gear. Good thing those things are pretty cheap, but still, it takes time to ship from China. In a meantime, steel wire 1.8mm has to work as landing gear replacement.

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