Trying to obtain velocity data from a MAWD (or other baro altimeter) has been discussed before. Unfortunatley, there is no good way to do it. The altitude data you have is rather poor on a point by point basis to allow reliable mathematical analysis; especially when the rocket is moving fast. The good news is that baro altimeters do provide fairly reliable apogee data as the rocket is moving fairly slowly at apogee and the sensor can accurately measure the altitude.
NAR# 92125 L1
Total Impulse for 2011: 1,729 N/s
Total Impulse for 2012: 1,689 N/s
Total Impulse for 2013: 795 N/s
A:6, B:5, C:19 D:15, E:4 F:0, G:0, H:1, I:0