Eggtimer Rocketry Eggtimer User Manual page 37

To download the detail data, press the button again... you will see something like this.
T,Alt,Veloc,KAlt,KVeloc,LDA,BurnT,LowV,Apogee,N-O,CHA,CHB
0,-10,-200.00,-0.48,-9.52,0,0,0,0,0,0,0
50,18,560.00,1.17,32.87,0,0,0,0,0,0,0
100,27,180.00,4.32,63.03,0,0,0,0,0,0,0
150,40,260.00,9.55,104.73,0,0,0,0,0,0,0
200,57,340.00,17.36,156.01,0,0,0,0,0,0,0
250,75,360.00,27.53,203.55,0,0,0,0,0,0,0
300,95,400.00,39.99,249.24,0,0,0,0,0,0,0
350,118,460.00,54.82,296.57,118,0,0,0,0,0,0
etc..
The first data field is the elapsed time in milliseconds, the second data field is the altitude in feet,
and the third data field is the velocity in ft/sec. The two "K" fields are filtered data, the rest of the
values are event markers th at show when various flight milestones have been reached. After you
close the file, you can open it with the data analysis program of your choice. For example, if you
import it into Excel, you can graph Time vs. Alt and Time vs. Velocity. See our web site,
www.eggtimerrocketry.com
you get the hang of it. You can also import the CSV data into statistical software packages, although
this is beyond the scope of what we're doing here.
An Excel graph from this data looks something like this:
1600
1400
1200
1000
800
600
400
200
0
0 10000
-200
The "Alt" trace is altitude @ time, the "KVeloc" trace is the filtered altitude @ time. The other
"spikes" are event markers; they point to the altitude and time at which specific events in the flight
have occurred. For example, the "LowV" marker shows that the Low Velocity event (the end of
Mach Lockout, after 1 second of <100 ft/sec velocity has been detected) occurred at about 8 seconds
and 1270 feet.
, for step by step instructions on how to do this; it's not difficult once
20000 30000
- 37 -
40000 50000
Alt
KVeloc
LDA
BurnT
LowV
Apogee
N-O
CHA
CHB
60000