In December 2004, I gave a demo of the Destruct-o-tron
at the Christmas dorkbotlondon
meeting. (The Destruct-o-tron is a large bank of capacitors which can discharge an immense
amount of electrical energy very quickly).
Dave with the first 'victim'...
Ready for launch. The CD is sitting on an aluminium disc (ex hard-drive platter), on
top of a CD case cover, on a coil of 5 turns of 6mm2 wire (the CD
case is just to ensure the platter is sitting on top of the coil, not inside it.
As this was a semi-public affair, some containment was in order - a short length of ten
inch polythene gas pipe, with a thick MDF insert in the top. A Perspex sheet protects
against the occasional disintegrating cable and escaping CD shrapnel fragments.
Ready to fire..
BANG...... Approximately 1.5 kilojoules of energy is dumped into the coil. This creates
a massive magnetic field, which in turns induces a huge electrical current in the disc,
generating an opposing magnetic field, and the resulting force provides a very large
acceleration of the disc away from the coil.
Well that was fun, but we still had one CD left... In a flash of inspiration, I decided
that it might be fun to fire the second CD while still in its slim jewel case. This was
based on the theory that more plastic = more debris = more fun. However the resulting
devastation was so much more than that....
On removing the containment tube, apart from many, many small bits of broken CD and
case, we were greeted by the sight of the cardboard inlay impaled on the spike, in a way
I'm sure we couldn't have repeated if we'd actually been trying to do it...!
Some of the debris....