A further update from my previous post on my iPhone rocket launch.
Here is a plot of the first few seconds of the launch from the accelerometer:
You can see that the data peaks at 3g when I was expecting 12g. The acceleration heads back up from negative territory quicker that predicted as well. The prediction is from RASAero.
The red line at 1 at t < 0 the phone is sitting upright in the rocket before launch. Most of the acceleration is in the Y axis at launch but some is in Z as the rocket leans over into the wind. The ejection charge, in theory, goes off at 15 seconds or so but at 22 seconds the accelerometer goes nuts and by 27 seconds the iphone is now inverted, hanging upside down from the parachute. The data dies for some unknown reason when it hits the ground at t=74s.
I need to look for rotation in the X and Z axes with Fourier or something.
2008-11-06 » lolife