Click on the photo above to load a video of this flight (1.5 meg MGP file, 9 seconds of video)	Quick summary: Flight duration:  Thrust duration: Altitude at apogee:  Fuel Weight:  Nozzle throat:  Launch weight: Total Impulse:	6.0 seconds 0.7 seconds 40 meters 124.7 grams KN/sucrose 5/16 inch 4.68kg 147 N-sec

Details:  Spreadsheet output:
 

LumberCalc	Version 1d			Data from Flight 12-23-01A	Flying  4x4,  Flight 1
Measured:				Calculated:
Distance *	Feet	Meters		Rise/Run at apogee:	0.505423	< 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	243.5	74.21518		Height at apogee:	40.0287	< distance to apogee * rise/run ratio at apogee
D. Launcher to touchdown	33.45	10.19506		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:	30.89837	< height at apogee - height at burnout
F. Rise on pole at apogee	2.33	0.710149
* Letters A-F refer to drawing on Sheet 2				Rise time, burnout to apogee:	2.511133	< calculated from rise height, deceleration by gravity
				Time, launch to apogee	3.211133	< boost time + rise time
Time	Seconds			Fall time, apogee to ground	2.858168	< calculated from height at apogee & gravity
Thrust duration	0.7			Total Flight time (calculated)	6.069301	< calculated boost + rise + fall time)
Descent from apogee	2.879			%Error between flight times:	-0.01155	< comparing measured vs. calculated times
Total flight time (measured)	6
				Velocity at burnout (m/sec)	24.6091	< calculated from rise height, deceleration by gravity
Weight	Kilograms			Acceleration, actual (m/s^2)	35.15586	< velocity at burnout / thrust duration
Fuel charge	0.1247			Acceleration, felt (m/s^2)	44.95586	< actual acceleration + gravity
Total launch weight	4.677			Thrust (Newtons)	210.2586	< felt acceleration * total weight
				Total Impulse (N-Sec)	147.181	< thrust * thrust duration
				Isp (N-Sec/kg)	1180.281	< total impulse / mass of fuel charge
Jimmy Yawn				Seconds	120.4368	< Isp / gravity
jyawn@sfcc.net
12/23/01				Height (of doubtful accuracy)	40.61434	< calculated from measured fall time

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

Events:
1.8 seconds, Ignition switch clicks
2.6 seconds, Thrust begins
3.3 seconds, burnout
8.6 seconds, vehicle hits ground

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

JY
12/31/01