Oz-12 & 13 Flight results
Oz-12: 1/26/08 and Oz-13: Date: 02/16/08
Oz-13 Launch: 1:29 pm CST - Ozonesonde hitchhiker
Burst: 3:19 pm CST
Landing: 3:40 pm CST
Peak Altitude: approx 104,000 feet, ascent rate 1000 ft/min.
Oz-12 Payload: 8 milliwatt FSK RTTY transmitter on 28.175 MHz - vertical dipole
Oz-13 Payload: 8 milliwatt AFSK RTTY transmitter on 144.345 MHz FM- vertical dipole
Experiment: Test of minimal insulation design using small cell bubble wrap.
Graph of Internal Temperature vs. Mission Elapsed Time
(Note that since the ascent rate was 1000 ft/min that the X axis also represents altitude in thousands of feet up to the burst point at 104k feet.)
Oz-12 (Green graph) was a test of 3layers of small-cell bubble wrap with black tape surrounding the electronics inside.
Oz-13 (Red graph) was a test of 2 layers of small-cell bubble wrap with no black tape surrounding the electronics inside.
As you can see, the 2 layers alone provide a great deal of insulation, keeping the payload above the freezing mark during the ascent stage.
Covering the electronics with a layer of black electrical tape and then surrounding it with 3 layers of small-cell bubble wrap seems to offer the most protection and temperature stability (see green graph of Oz-12 flight above).
- Bill WB8ELK