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

John Gorkos jgorkos at gmail.com
Wed Apr 9 09:49:38 CDT 2014


Based on the "Final Student Lesson Learned", the Army crew around here
would like you to please pass on to any of those Fine Young Midshipmen
that, if they plan on becoming Marines, that lesson translates directly
to "Pull the Pin from Mr. Grenade BEFORE you throw it."  Otherwise, the
guy you threw it at WILL pull the pin, and throw it right back.

No, I didn't learn that the hard way.

Glad you guys got your balloon payload back.

John Gorkos
AB0OO
USMA '93


On 4/9/14, 9:43 AM, Robert Bruninga wrote:
> 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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