Recap of EOSS-144

03/02/2012 15:50 (CDT): Photos and movies added, recap pretty much complete now

Flight Coordinator: Nick Hanks, N0LP

LAUNCH DATE: July 18th, 2009
LAUNCH TIME: 07:41 CDT (12:41 UTC)

Pre-flight Prediction and Actual Tracks

E0SS-144 AE0SS-11

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

Map made with MapPoint
Prediction made with Balloon Track


Green Track = Ascent
Red Track = Descent
Prediction and Actual tracks made with Balloon Track

Maps by Google Earth


Launch Site - GPSL2009 Prim
Launch Point: 39.0438� lat.   -95.7505� long.
Grid: X=10.48 Y=60.29
Ascent Rate: 1324 feet per minute
Descent Rate: 950 feet per minute
Altitude: 1078 feet
Predicted Landing Site
Landing Point: 38.16776� lat.  -95.03852� long.
Grid: X=49.3 Y=-.2
Altitude: 4500 feet
Flight Time: 116 Minutes
Bearing: 147.4� True
Range: 71.7 Mi.
Actual Landing Site
Landing Point: 38.31998� lat.  -95.2118� long.
Grid: X=39.8 Y=10.3
Bearing: 149.7� True
Range: 57.8 Mi.
Difference from Predicted to Actual Landing Site
Bearing: 318.2� True
Range: 14.097 Mi.

Final Pre-Flight Prediction is available here

Prediction History is unavailable. A last minute (night before) launch location change makes history irrelevant.

Payload Experiment Designer

  • EOSS - Flight qualification possibilities

Experimenters are welcome to submit websites for linking or overviews which I will post on a page on the EOSS website.

EOSS Flight Day Frequencies:

Tracking and Recovery Frequencies


EOSS-144 Balloon Payload Frequencies

  • Beacons
    • 145.600 MHz
      • CW ID: W5VSI
  • APRS
    • 144.340 MHz
      • ID: AE�SS-11
      • DIGI: EOSS
      • Node: BALNOD
      • APRS Time Slotted Every 30 seconds at 0:00 and 0:30
        • power up at 58 seconds past the GPS minute to properly slot telemetry
      • Telemetry once a minute
      • Sample Data
  • ATV
    • 426.250 MHz AM
      • ID: AE0SS
      • GPS overlay

Flight Systems: 


Balloon Manufacturer Kaysam
Balloon Type latex
Balloon Size 1200 gram
Neck Load 12.23 lbs.
Neck Lift 15.95 lbs
Ascent Rate 1324 fpm estimated
Descent Rate 950 fpm estimated
Parachute 5 ft.
Peak Altitude determined after flight
Launch Conditions determined at launch


Payload Configuration:

Tracking and Recovery Info:

Everyone who attended GPSL was in on the T&R effort

Internet Gateway Stations:

as seen on Findu.Com



  • K0KU - Kansas University Amateur Radio Club, Lawrence, KS
  • AB0XK-8 - Robert Roe, Russell, KS

Not too many iGaters this flight but we really wish to thank both Bob Roe and KUARC for their support. Many EOSS members were stuck in Colorado during GPSL 2009 and it was really nice to be able to follow all the flights via Findu or APRS.FI or a direct connection to APRS-IS.

EOSS wishes to express our sincere appreciation to the stations above who iGated the balloon APRS telemetry onto the internet. 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.  Currently predictions are being made for 29 i-gates.

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.

Text Recaps

  • none yet


I have photos from WA0GEH, W9CN, KB0YRZ, KC0RPS, WD0DKT and SamCam. I'll be working on them next

Symposium on Friday


Launch Site


Other Groups


Recovery Site



General Recovery Operations


Airborne SamCam Pictures

SamCam takes 700 plus photos during an average flight. What is posted here is a representative sample only.



  • Look up - none captured
  • Look towards Horizon - none captured
  • Look down



no audio


samcam time lapse of ascent


GPSL 2009 EOSS-144
video by Nick Hanks, N0LP
edits by Rick von Glahn, N0KKZ






Spread Sheets

Mapping Files