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Plucky Playmonaut bails out of smoking Vulture 2

Servo meltdown drama during ground avionics test

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Our plucky Playmonaut has decided to take a long weekend off after a servo meltdown during a ground avionics test of our Vulture 2 spaceplane prompted a sharpish exit from the vehicle.

Here's the scene immediately after the scare, as emergency crews rushed in to cordon off the area, douse the offending kit with foam and gave our man a quick once-over:

The servo doused in foam as a fireman, doctors and workers gather around our Playmonaut

The servo in question...

The canard servos inside the Vulture 2

...controls one of the canards (not attached in these photos), and its horn can just be seen here poking out behind the onboard Raspberry Pi:

The Playmonaut in his seat just behind the offending servo

Well, we've been running the Pi, Pixhawk autopilot and other avionics bits and pieces (details here) for a while, without incident. However, when we decided to give some new canard servo linkages a run for their money, the starboard servo began to billow smoke, prompting an emergency evacuation.

Suffice it to say, while the servo's a write-off, the rest of the aircraft was undamaged. More importantly, our Playmonaut suffered nothing more than a nasty scare.

The poor bloke's really been through the mill in the course of the Low Orbit Helium Assisted Navigator (LOHAN) project. He bravely stepped into the shoes of our previous pilot - tragically lost at sea in December 2012 - and since then has suffered two terrifying stratodangles, one from 34,571m, and another from 23,000m, also involving a dramatic rescue from a Spanish mountainside.

So, we've given him some beer tokens and packed him off for a few days while we await a replacement servo and tackle what we think might have caused the meltdown. For reference, here's an annotated snap of the Vulture 2's bulging electronics package:

Annotated version of the Vulture 2 avionics rig photo

Both the Pixhawk and the servos are powered from same rack of AA batteries, via the 3D Robotics power supply module. This has a dedicated output for the Pixhawk, and a secondary which we've hooked up to the autopilot's servo rail.

It's possible that a power module glitch served up excess volts to the servo rail. Just in case, we've swapped the unit out. APM:Plane and APM:Rover lead developer Andrew Tridgell had already suggested we might need a Zener clamping diode on the rail, so we've ordered one of those just in case.

We'll report back shortly on the result, just as soon as we've wrapped the final attachment of the canards, which is what we were doing when the cabin filled with smoke. ®


More from the lovely LOHAN:

  • You can find full LOHAN coverage right here.
  • If you're new to LOHAN, seek out our mission summary for enlightenment.
  • There are photos our our magnificent Vulture 2 spaceplane here, and detailed structural plans here.
  • For your further viewing pleasure, we have all our photographic material stored on Flickr.
  • Our LOHAN and Paper Aircraft Released Into Space (PARIS) videos live on YouTube.
  • We sometimes indulge in light consensual tweeting, as you can see here.

LOHAN - A Special Projects Bureau production in association with...

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  • 3D Robotics logo
  • Edge Research Laboratory logo


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