Click on the photo above to load a video of this flight (1.1 meg MPG file, 6 seconds of video)	Quick summary: Flight duration:  Thrust duration: Altitude at apogee:  Fuel Weight:  Nozzle throat:  Launch weight: Total Impulse:	5.4 seconds 0.6 seconds 35 meters 119.7 grams KN/sucrose 5/16 inch 4.72kg 134 N-sec

Details:  Spreadsheet output:
 
 

LumberCalc	Version 1d			Data from Flight 12-23-01B	Flying  4x4, flight 2
Measured:				Calculated:
Distance *	Feet	Meters		Rise/Run at apogee:	0.433839	< ratio of height on pole at apogee / distance to pole
A. Camera to measuring pole	4.61	1.405059		Rise/Run at burnout:	0.10846	< height on pole at burnout / distance to pole
B. Camera to launcher	276.2	84.18165
C. Camera to touchdown	252.2	76.86681		Height at apogee:	34.93459	< distance to apogee * rise/run ratio at apogee
D. Launcher to touchdown	24	7.314843		Height at burnout:	9.130331	< distance to burnout * rise/run ratio at burnout
E. Rise on pole at burnout	0.5	0.152393		Rise height after burnout:	25.80426	< height at apogee - height at burnout
F. Rise on pole at apogee	2	0.60957
* Letters A-F refer to drawing on Sheet 2				Rise time, burnout to apogee:	2.294815	< calculated from rise height, deceleration by gravity
				Time, launch to apogee	2.894815	< boost time + rise time
Time	Seconds			Fall time, apogee to ground	2.670114	< calculated from height at apogee & gravity
Thrust duration	0.6			Total Flight time (calculated)	5.564929	< calculated boost + rise + fall time)
Descent from apogee	2.72			%Error between flight times:	-0.02296	< comparing measured vs. calculated times
Total flight time (measured)	5.44
				Velocity at burnout (m/sec)	22.48919	< calculated from rise height, deceleration by gravity
Weight	Kilograms			Acceleration, actual (m/s^2)	37.48198	< velocity at burnout / thrust duration
Fuel charge	0.1197			Acceleration, felt (m/s^2)	47.28198	< actual acceleration + gravity
Total launch weight	4.718			Thrust (Newtons)	223.0764	< felt acceleration * total weight
				Total Impulse (N-Sec)	133.8458	< thrust * thrust duration
				Isp (N-Sec/kg)	1118.177	< total impulse / mass of fuel charge
Jimmy Yawn				Seconds	114.0997	< Isp / gravity
jyawn@sfcc.net
12/23/01				Height (of doubtful accuracy)	36.25216	< calculated from measured fall time

Click here to download a copy of this spreadsheet, Excel format

Events:
1.0 seconds, Ignition switch clicks
1.9 seconds, Thrust begins
2.6 seconds, burnout
7.6 seconds, vehicle hits ground

Note that the launcher is about 270 feet from the camera, causing a delay of about 0.25 second between the visual event and its sound.  Thus the ignition lag is about 1/4 second less than the .wav file would suggest.
 

JY
12/31/01