[aprssig] Balloon lost near Shrewsbury, PA (FOUND!)

Robert Bruninga bruninga at usna.edu
Wed Apr 9 08:43:27 CDT 2014


Balloon found.  We returned to site on 8 April with post-flight analysis
and better estimate of where to look.

We were only about 100  yards off.



Details:  http://aprs.org/balloons.html



Final student lesson learned:  Turn the Highdef video camera on before
release.



Since the students have the payload intact, we may try again in the next
weeks or so.



Bob, WB4APR



*From:* Robert Bruninga [mailto:bruninga at usna.edu]
*Sent:* Monday, April 07, 2014 10:48 AM
*To:* aprssig at tapr.org; aprs at yahoogroups.com
*Cc:* amsat-bb at amsat.org; kang at usna.edu
*Subject:* Balloon lost near Shrewsbury, PA



Short Story.  The balloon is lost near Shrewsbury, PA. But we are sure (now
after post processing) that we know where it is within about an acre.

See: http://aprs.org/balloons.html



Premature burst (or separation) caused the payload to descend at over 5000
feet per minute slowing to 4000'/min (nearly 50 MPH straight down)at last
posit.  We did not know this at the time, and wasted our time searching the
track 1/2 mile beyond the last data point assuming the much slower parachute
design rate of 600'/min.



When we got home, post processing revealed the high descent rate and the
more likely spot much closer to the last known position.  Also the high
impact is why it probably ceased transmitting.



Also we were looking for a balloon and parachute in the trees, not (as it
turns out) for the football sized Styrofoam box (mostly covered in black
duct tape!) somewhere on the ground in the underburush.  We would not have
noticed that between other occasional trash in the area.



Contact info is on the balloon.



Bob, WB4APR

410-293-6417
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