MM21B - 2019-05-23
Tracker Type: APRS
Powered by 2 AAA batteries
gpsLockTimeoutMs = 150000 (150s, 2m, 0h)
gpsRetryAfterMs = 10000 (10s, 0m, 0h)
transmitCount = 2
msBetweenTransmits = 3000 (3s, 0m, 0h)
lhAltFtThreshold = 10000
hAlt.wakeAndEvaluateMs = 180000 (180s, 3m, 0h)
lAlt.wakeAndEvaluateMs = 50000 (50s, 0m, 0h)
lAlt.stickyMs = 24000000 (24000s, 400m, 6h)
dz.wakeAndEvaluateMs = 7200000 (7200s, 120m, 2h)
Balloon and Payload
- 36" Qualatex
- 30.1 gram payload
- 1.98 grams free lift
Miles traveled: 1,218
Flight hours: 68.5
Max Altitude feet: 18,843
Cause of death: Slow leak
General Thoughts / Observations
This flight’s theme was to reach Mississippi and also to test a 5/4 wave transmission antenna. The balloon did make it to Mississippi and beyond, the 5/4 wave antenna did not prove to be a better antenna than the 1/2 wave.
On May 23, 2019, MM21B flew out of Florida and into the gulf. After a day of silence, the balloon showed up in Mississippi and started heading northeast. From Mississippi the path formed somewhat of a large arc, it crossed Alabama, Georgia, then slowly descended and landed in South Carolina.
The balloon demonstrated great float for multiple days, why it started to slowly descend is not known. It's possible that under pressure the balloon simply leaked out its free lift over a couple of days.
This longer flight was fun to watch and picked up three new states for the list. It also helped conclude the APRS Antenna Length Test and show that we should stick with 1/2 wave antennas.
Thoughts for next time
Monitor % of missing sequences of future flights, see if the number is consistent among 1/2 wave antennas.