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                                                            Red Earth / Blue Earth

NSL-90 launched on the morning of Sunday, May 2, 2021.   Matthew L. had some experiments to try.   His 700g payload consisted of a single box with:
  • AP510 APRS tracker
  • TTGO T-beam LoRa tracker
  • Mobius Mini camera (70 degree field of view)
  • 808 #16 camera with its infrared-cut filter removed (120 degree field of view)
  • Various plant seeds experience high altitude radiation

  Matthew successfully holding back his excitement for the flight

  Wide-angle view of filling

An old 808 wide-angle camera had its infrared-blocking filter removed to help show some of the differences in springtime NC.  Light below red, now allowed into the camera, would activate primarily the red and blue sensors.  This gives the video a strange magenta hue and strong IR reflectors, like plants, will show up much brighter.   A normal Mobius Mini camera, mounted along side as a context camera, had a smaller field of view.
Tim W. and Paul L. assisted on this flight.  A 600g cell was filled with H2 to produce 2kg of neck lift.

   Dramatic differences in camera fields of view

  Matthew releasing NSL-90

This shows the Apex area from above with the "wide band" camera.  A pseudo-near-infrared image can then be processed by taking the camera's sensitivity and Bayer filter into account.   Young leaves of deciduous trees look different than evergreens. 

  Jordan Lake in the distance

Above are similar views from the two cameras.  Water shows up especially dark using the "IR" camera.

The flight progressed as expected.  At 14km altitude, the flight ascended through a cirrus cloud layer.  A shower of tiny ice crystals are seen and heard on the video recordings.   The chase crew continued down to Farmville, NC for recovery.   As NSL-90 passed 20km, the balloon flew above the eastward jet stream.  So the flight just spun in lazy circles as it ascended.   Again on this flight, Habhub's ingest of APRS data seemed to be on a 10 minute delay.
  Crazy flight profile watched from the chase car laptop

  Moon set from 30km

  A typical day over NC

The cell burst at 31141.5m  (102,170ft).
    Burst from both cameras

    Payload tip-over at burst

The chase crew waited patiently near Maury, NC.  But it was soon discovered that the flight was descending too fast.  The balloon remains fouled the parachute.   So Tim and Paul drove their cars west to the more densely forested area around Snow Hill, NC.

  Payload about to hit the trees, with open fields in sight

Ten minutes after touchdown, they arrived in the area and received a fix on the payload's resting place.  It reported being 15m above ground level.  Thankfully, Tim is excellent with a bow, arrow, and line.   So after securing safe land access, the crew loaded up on bug spray and headed into the woods for retrieval.
  Recover crew headed into the woods

   Flight visualization

Ascent rate                     Internal (AP510) and external (TBeam) temperatures