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

Jim Sanford wb4gcs at wb4gcs.org
Sat Apr 12 22:37:09 CDT 2014


I love it......

73,
Jim
wb4gcs at amsat.org
USNA '76

"Nuke them all, let God sort them out.....:"
-- obsolete saying from the 1980's....

On 4/9/2014 10:49 AM, John Gorkos wrote:
> 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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