Recap of EOSS-113

LAUNCH DATE:  November 11,2006
LAUNCH TIME: 7:26 am MST (14:26 UTC) 
LAUNCH SITE: Windsor, CO (Driving Directions)

Students rush to recover their payloads

Pre-flight Prediction and Actual Track

Blue = Actual Track
Green = Predicted Ascent Phase
Red = Predicted Descent Phase

Maps made with MapPoint
Prediction made with Balloon Track
Download this MapPoint PTM Map file

Launch Site - Windsor
Launch Point: 40.47367� lat.   -104.96233� long.
Grid: X=-22.43 Y=25.57
Ascent Rate: 1100 feet per minute
Descent Rate: 950 feet per minute
Altitude: 4931 feet
Predicted Landing Site
Landing Point: 40.36443� lat.  -103.32837� long.
Grid: X=63.5 Y=18.0
Altitude: 5000 feet
Flight Time: 123 Minutes
Bearing: 94.5� True
Range: 86.2 Mi.
Actual Landing Site
Landing Point: 40.65371� lat.  -102.94961� long.
Grid: X=83.1 Y=38.0
Bearing: 82.6� True
Range: 106.3 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 44.7� True
Range: 28.186 Mi.

Prediction History for EOSS-113 AVAILABLE HERE (new to recaps)

EOSS Flight Day Frequencies:

HF Frequencies

  • 7.235 MHz + QRM
    • net control - KB0LP, Dave Galpin
    • start probably 30 minutes prior to launch

Global Frequencies

Balloon Frequencies

  • Beacon (intermittent only worked during the final stages of ascent above ~ 70K feet)
    • 147.555 MHz
      • ID: AE0SS (CW)
  • APRS
    • 144.340 MHz
      • ID: KC0YA-11
      • DIGI: EOSS
      • Node: BALND2
      • APRS Time Slotted Every 30 seconds at 0:15 and 0:45
        • power up at 13 seconds past the GPS minute to properly slot telemetry
      • Telemetry once a minute
      • Sample Data

Flight Systems:

Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 3000 gram
Payload 25.9 lbs
Free Lift % calculated at fill
Ascent Rate 803 fpm average liftoff to burst
Descent Rate 1000 fpm estimated
Parachute 10 ft
Peak Altitude 98,832.02 ft. ASL
Launch Conditions determined at launch


Payload Configuration:

Tracking and Recovery Info:


Location X Y
West Junct. of SR-14 and SR-71 45 35
Peetz 75 59.3
Otis 82.6 3
Roggin 8 4.5


Tactical Callsigns

Tactical Callsign Name Notes
Alpha N0MPM and WA0GEH Mike and Marty Tracking and Recovery Coordinator
Bravo KC0SOW, W0CBH  and N0NDM Marcia, Benjie and Larry  
Charlie KB0URZ and WG0E Chris and Colin  
Delta KC0RPS Jim and Darren  
Echo KC0VJE Louis  
Foxtrot KB0QQW Chris and Caleb  
Golf K0SCC Steve, Daryl and Whitney  
Hotel AE0SS Nick Ground Station

Internet Gateway Stations:

as seen on Findu.Com

For KC0YA-11

  • K0AEM-1 - Richard Beggs, Thornton, CO
  • K0ANI - Larry Cerney, Denver, CO
  • K0YG-3 - Mark Patton - Foxfield, CO
  • KC0MWM - Roger Hammond, Grand Island, NE
  • KI4GYZ - Art Hostmark, Thornton, CO
  • N0PSJ - Christopher Holmes, Arvada, CO
  • N0YXV-1 - Stanley Coleman, Grand Island, NE
  • WY0F - Jack Barnard, Grand Island, NE

EOSS wishes to express our sincere appreciation to the stations above who iGated the balloon APRS telemetry onto the internet. We have quite a contingent from Grand Island, NE! Thanks guys!! You have all i-gated before but did you know I publish predictions for i-gates? I keep a list of everyone who has ever i-gated an EOSS balloon flight. You're all in the list so if you're wondering when the balloon will pop up over your horizon, check out this page for future flights. If your callsign does NOT appear, it means the balloon does not rise above your local horizon. Currently predictions are being made for 28 i-gates. For the prediction of EOSS-113, only 23 of them saw the balloon rise over their horizon. So, if you don't see your callsign it doesn't mean I've dropped predictions for you, just that for that particular flight the balloon won't be visible from your location.

We are relying heavily on real time position information available on the net to allow the FAA controllers to have up to the minute location data to assist them in air traffic control.

Redundant stations for the balloon iGating provide excellent coverage. If you are able to iGate we invite you to join the Internet Gateway Team. Contact me ( to be put in touch with the coordinator. By joining the team, you are giving peace of mind to the iGate coordinator for that flight. He knows you'll be there and he can rely on you.

Naturally, anyone can iGate data onto the net and even if you aren't a member of the team we will welcome your contribution to the internet based tracking effort. If you callsign appears on the log, you'll be shown as a contributing station as those above are.

Having more than one station covering each APRS beacon means that should a station drop out momentarily, the others can often maintain the data flow.

Thanks again guys! The FAA (and EOSS) are very grateful for your assistance in this endeavor.

Future I-Gaters:

Check out the EOSS I-Gate page for information on how to participate and why we need you.

Current I-Gate Stations:

Guys, the prediction program used to determine the track of the balloon prior to flight can now output a prediction for the Rise, Closest Approach or maximum elevation, and Set of the balloon for each of your stations. I have posted a prediction page for stations that I have been able to discover geographic coordinates. See the I-Gate prediction page for an example. The page will not be updated daily, however, it will be updated the evening prior to flight for I-gate planning purposes.

I have often been asked by iGaters when they should expect to either start receiving signals (AOS) or expect to see those signals disappear (LOS). This prediction page should answer all those questions for you.


Colorado University Gateways program

note: customers are welcome to submit detailed synopses of their flights or web links to their own web sites.


An HF Net recap by Dave Galpin


Launch Site

Recovery Site


Tracking and Recovery audio of the flight as recorded from the Rocky Mountain Radio League's 449.450 MHz repeater.

  • eoss113_ascent.mp3 - 9 MB
  • eoss113_descent.mp3 - 3 MB
    • Trackers left reliable repeater coverage just before touchdown, so the audio ends prior to a reported touchdown and any recovery efforts.


Roger Hanson, N0EXA video of EOSS-113 from the ground station. Video from YouTube is 15+ minutes long and conveys a pretty good impression of what happens during the run up to launch and operations at the ground station while the flight is in progress.


Text Files

Spread Sheet (CSV) Files

made from the "eoss113_kc0ya_master.txt" file above

MapPoint File

Google Earth

A new capability added to Balloon Track. May be useful on recaps in the future. May not. I haven't really decided yet.