The Free Fall Indicator

Joachim Köppen DF3GJ Kiel/Strasbourg/Illkirch Winter 2004

This is a sensitive device which indicates with a lit LED whenever the instrument feels to weight in the vertical direction (details TBD)

This is a long time exposure showing several test flights of the device launched upwards into a ballistic trajectory until plunging into my bed:

Here is another, very simple version of the accelerometer, whose deflection will indicate the commencement of the free fall (details TBD)