Recap of EOSS-67
Mike Gray [KD7LMO] photo of the
lift off of GPSL 2003 balloons.
Click picture for slightly higher resolution image.
Links to other GPSL recaps are available at the
Great Plains Super Launch 2003 Web Page
LAUNCH DATE: June 14, 2003
LAUNCH TIME: 07:35 am MST, 13:35 UTC
LAUNCH SITE: Deer Trail (directions)
Launch Site - Deer Trail
Launch Point: 39.6114° lat. -104.0426° long.
Grid: X=15.69 Y=29.57
Ascent Rate: 1000 feet per minute
Descent Rate: 915 feet per minute
Altitude: 5205 feet
Predicted Landing Site
Landing Point: 39.6754° lat. -103.7823° long.
Grid: X=29.5 Y=34.0
Altitude: 4501 feet
Flight Time: 131 Minutes
Bearing: 72.2° True
Range: 14.5 Mi.
Actual Landing Site
Landing Point: 39.4926° lat. -103.7141° long.
Grid: X=33.2 Y=21.4
Bearing: 115.0° True
Range: 19.3 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 163.9° True
Range: 13.1 Mi.
If an EOSS payload is highlighted, there is a link to an
information page about that payload.
Full Frequency Guide for GPSL Balloons
(note: the number in parenthesis following the frequency is
the time slot in seconds after the GPS minute)
EOSS Grid Layout:
Grid Calculator centered on Last Chance with a lat long of:
- 39° 44.441 North
- 103° 35.615 West
||12 lbs. (5 balloon sats) + EOSS payloads
|Free Lift %
||1200 fpm variable. Probably leak resulted in steadily
decreasing ascent rate until it finally went into a slow descent.
||at cutdown ~ 1000 fpm sea level
||70 in. diameter (HM-2)
Arizona Near Space Research (ANSR)
Montana State (Borealis)
Edge of Space Sciences (EOSS-67)
Experimental Sub-Orbital Society (ES-OS)
Treasure Valley Near Space Program (TVNSP)
No audio recording were made for this flight.
From the Tracking Perspective
by Benj. WØCBH
Wow, what a great day.
Left at 4:30 am to pick up the driver and got back at around 5:30 pm.
We helped unload the helium bottles for the launch teams and we also
watched KMark launch his mylar balloon. We left the site before the launch of
the five latex balloons.
I had trouble with my computer and Nick's tracking program through most of
the day. I finally gave up and just decided to use street atlas for the maps.
Worked okay then.
Had a great talk with the owner of most of the land east of Agate. His
brother-in-law owned the land where EOSS 67 landed.
I got his phone number and will try to add it to the list of people we know
out east of Denver. Might come in handy someday.
Marty directed us to go to the aid of the Idaho team on their first balloon
which landed southwest of Deer Trail. We went back that way, found the Idaho
team and followed them to the proper road to get to their payload. Their
computer was working all right and they found their systems without any help
from the DFing antennas.
We then decided to head back to town and let my new driver meet some of the
launch team. We had a great time talking with all of them until KMark's
balloon finally decided to land. We then tore off west to help.
After many frustrating minutes of trying to find the proper roads, we got
the landing grid point computed using Nicks grid calc program and off we went
in search of KMark's payload which had become detached from his balloon which
was skipping all over the countryside, with N0NDM and crew chasing it.
We finally found the signal after Larry K0ANI pulsed the commandable beacon
and tracked it to a field full of vicious buffalo. Vicious things.
After a sizeable delay, the owner came down and allowed the rest of the
tracking crew to go out and retrieve the payload. It took long enough for that
to happen that Rick, N0KKZ and N0LP had time to come out and find the landing
site and observe our methods of recovering payloads in dangerous areas. Ha! We
even found a buffalo pie for Larry, N0NDM, who was still chasing the mylar
We had a great time at lunch in the cafe in Bennett. We met some new people
and got to talk to the Idaho group. They live about 12 miles east of where I
went to high school and college. I had a great time talking with them about
Idaho. Haven't been back since my 30th high school reunion and next year is
All in all my new DRIVER and I had a great time. We didn't get up on two
wheels while making high speed turns, but that is okay. We had a good time,
and learned some more about relaxing and listening for weak signals. Now, all
I have to do is get my stupid computer to work so that I can read the packets
as well as Chris. I did something different this time by mounting my dual band
yagi in place of the single band yagi, and it worked well tracking signals on
both bands. It also allowed me to communicate through a poorly responding
repeater when I was in a bad spot. So, will have to add that to the permanent
That's all folks.
From the ES-OS Perspective
My my, what a day !
I'd like to extend a huge thanks to the EOSS gang and others that helped in
the recovery of the "ES-OS" flight string. I thought it would be elementary as
I got a position report from 100 feet AGL, but it apparently involved
negotiating a yucca field inhabited by man-killing buffalo. The yucca did a
number on my bottom package and completely discombooberated the "ChemSat"
payload built by Adam's State College students. (Indeed, the trackers
initially reported finding only an empty blue box.) Thanks to the EOSS
trackers that back-walked the ~1/4 mile drag path to discover the debris field
and recover the guts (I hope all) of the ChemSat. Meanwhile, the shredded bag
took off and flew another 10+ miles at 0 to 3000 feet AGL. I had a two pound
package on top of the balloon, but it just wouldn't tip over for three hours,
finally landing at just past 3 pm.
The initial thought was that there was an electronic failure of the flight
termination systems, but post flight inspection of the flight-termination
balloon-top blow-plug revealed two burn marks about the size of a golf-ball.
The electronics worked fine, but the blow plug refused to release. All the
room temp testing of this system apparently didn't accurately mimic the
environment the system encountered. That, or there was a rigging error. I'll
dig into that later.
Although it was a long day, we all had fun.
Finally, extra special thanks to Larry and Dick for
- Hauling helium to the launch site and
- Helping us with the disposal chores for the 126k cu foot bag.
Bruce, NAØBR started the net at or about 06:15 local time (12:15 UTC) on
7.228 MHz. The band was not very cooperative. He moved about between there and
7.240 MHz looking for a clear piece of bandwidth. Propagation was not too good.
Distant stations were heard but only sporadically.