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LOHAN sets clock ticking for explosive climax

Just what our mission control board will do, and when...

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The smart choice: opportunity from uncertainty

Work is proceeding apace on our Low Orbit Helium Assisted Navigator (LOHAN) "Swift" control board, as recently unveiled to an astounded world.

Click here for a bigger version of the LOHAN graphicAnthony Stirk and Neil Barnes are beavering away at assembling the board and tackling the coding, respectively. Earlier this week Anthony got the GPS chip on the Swift up and running - the vital component which will ultimately be responsible for firing the Vulture 2 spaceplane's solid rocket motor.

As we reported last week, the Swift (pictured below) is a potent device, packing the tried-and-tested uBlox MAX-6 GPS, BMP085 Pressure Sensor, a couple of radio modules, APRS (Automatic Packet Reporting System) capability and no less than three temperature sensors plus five general purpose input/outputs (GPIOs).

An underside view of the board

After some discussion, we decided to add an accelerometer to the package, to help us detect balloon burst. This will, in parallel with the GPS – which can also obviously be used to detect drop in height – act as a failsafe ignition trigger in the event of premature balloon burst.

Or rather, they'll act as a failsafe if it's absolutely necessary to launch the Vulture 2 without further ado. We'll have two meteorological balloons for the LOHAN mission, so if something goes awry on the first flight, we have the option for a second.

If the first flight is a bust, we'll recover the Vulture 2 along with the fantastical flying truss, and give the thing another pop.

This impacts on the Swift rocket motor ignition parameters, which are pretty self-explanatory:

  1. Arm ignition system at 60,000ft (18,300m).
  2. Fire rocket motor at [classified].
  3. First launch: In case of premature balloon burst, as indicated by accelerometer and/or GPS, abort launch.
  4. In case of abort, or ignition failure at launch altitude, ignition system safety shutdown after two hours, or when altitude falls below 40,000ft (12,200m), whichever comes first.
  5. Second launch: In case of premature balloon burst, as indicated by accelerometer and/or GPS, fire motor immediately.

The Swift is also tasked with data logging and radio transmission duties. Neil has expressed concerns that it might huff and puff under the workload, but we can if necessary use a second board to spread the weight.

We'll find out just how the Swift copes when it's ready for some full-fat testing, so watch this space for further developments... ®

Further LOHAN resources:

  • New to LOHAN? Try this mission summary for enlightenment.
  • You can find full LOHAN coverage right here.
  • Join the expert LOHAN debate down at Reg forums.
  • All the LOHAN and Paper Aircraft Released Into Space (PARIS) vids live on YouTube.
  • For our SPB photo archive, proceed directly to Flickr.
  • We sometimes indulge in light consensual tweeting, as you can see here.

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

  • 3T RPD logo
  • University of Southampton logo
  • Applied Vacuum Engineering logo
  • Escher Technologies
  • Flashpoint Fireworks logo
  • HAB Supplies logo

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