[aprssig] Balloon lost near Shrewsbury, PA

Jim Alles kb3tbx at gmail.com
Tue Apr 8 23:56:28 CDT 2014


Bob, I'll be driving through that area in the morning, and I would like to
stop and look if I have the time (before a 1:30 appt @ Johns Hopkins).

Wanted to coordinate efforts if anyone else was going to be traipsing
through the neighborhood.

Jim Alles, KB3TBX
814-280-0481


On Mon, Apr 7, 2014 at 10:47 AM, Robert Bruninga <bruninga at usna.edu> wrote:

> 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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>
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