I completely forgot to weight individual parts before putting everything together, so this table gives only approximate values:
| Component | Weight |
|---|---|
| Styrofoam box | 10oz |
| APRS tracker with GPS | 3oz |
| Canon A1100is camera | 5oz |
| 10xAA L91 batteries with battery holder | 9oz |
| Beacon with battery | 1oz |
| Hand warmers | 3 oz |
| Parachute | 5oz |
| Glue, velcro, misc | 4oz |
| TOTAL | 2.4 lb |
Plug this weight into HABHUB Burst Calculator, and it generated the following altitude prediction:
Altitude prediction
Translation: HAB-1 needed 105 cubit feet of helium, which generated 2.5kg (5.5lb) neck lift; balloon was expected to ascend for 78 minutes at 5m/s (15ft/s) rate and burst at 26km (85,000ft) altitude.
Helium
We bought a size “S” tank with 120 cubic feet of Helium. Rent of the cylinder was $50 and Helium itself cost $90.
Helium tank