HacDC Spaceblimp 4
From HacDC Wiki
Spaceblimp-4 sucessfully launched and retrieved: April 10, 2011
Summary
We launched from Breezewood Elementary School at 1:30 pm, the balloon popped at 2:41 pm at 103,764 ft, and touched back down at 3:09 pm. Again, we were exceptionally lucky with the recovery and were able to drive up to within 200 ft of the package.
Data
On-board Logging
The on-board datalogger keeps records of interior/exterior temperature and GPS data.
Media: SB-4_flight_log.gz (and here's the code in R that generates the above images, and some PDFs to boot: Media: spaceblimp4_analysis.gz)
Accelerometer
The accelerometer package flown was the same as last time, with the exception of having half the memory, so there are 50 observations per second. The data are 0-255, with (roughly) 127 being no acceleration. If you graph it, you can clearly see liftoff, popping, and landing. Until we get some time for analysis, the rest is left up to you:
Photos and Video
Launch Plans (Historic)
| Planned launch date: | Sunday, April 10, 2011 |
|---|---|
| Launch time: | 10:00 AM, Launch should take less than an hour. |
| Launch Location: |
|
| Coordination/Talk-in: | 146.685 MHz simplex |
| Planned Altitude: | 100,000 feet |
| Planned Ascent Rate: | 1,300 ft/min |
| Planned Descent Rate: | 1,000 ft/min |
| Primary Beacon: | Tiny Track 4 with 0.5 W transmitter on 144.390 MHz, call sign W3HAC-11 (map). $3 GPS module |
| Secondary Beacon: | Son-of-WhereAVR with ublox GPS. Yaesu VX-1 handi-talkie with 1 W Transmitter, call sign W3HAC-12 (map), Frequency 432.225 MHz |
| Payload: | Still camera, HD video camera, Geiger counter to measure cosmic rays, a nine degree of freedom Inertial Measurement Unit, accelerometer, pressure, light and temperature sensors. |
The balloon is a 2000g Kaymont/Totex with 291 cubic feet of helium. The total weight of the capsule is about five pounds.
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