In my school years I used to fly R/C model aircraft, and for my GCSE design/technology project I built a mechanism and circuit board to trigger a photographic flash unit to indicate when the engine ran out of fuel (fairly simple, magnets in a disc on the prop shaft, and capacitors to store the charge for the flash). This was all pre 9/11 so neither any of my teachers nor I considered that it could be easily repurposed with the flash replaced by a detonator to go off after the aircraft had been crashed into something... In case the plod are reading, I'm pretty sure the hardware will have long been junked by the school as I didn't keep it myself.
Biting the hand that feeds IT
