EOSS-257, 258, & 259 CU Science Discovery & Metro State Univ - Recap

CU Science Discovery video, "Young engineers aim for the stratosphere at Science Discovery Camp" is posted!

Here is a link to a CU Science Discovery page with experiment data, drone footage, and launch videos!

All three flights were very successful.

  • EOSS-257 launched at 8:30am reached an altitude of 95,019 feet, and landed at 39.420718, -103.55227 (12 miles to the north)
  • EOSS-258 launched at 8:43am, reached an altitude of 95,950 feet, and landed at 39.41011, -103.64215 (12 miles to the north)
  • EOSS-259 launched at 9:42am, reached an altitude of 95,240 feet, and landed at 39.410823, -103.63551 (12 miles to the north)
Original Announcement: 

LAUNCH SITE IS Limon Colorado. Please have your payloads at the launch site 1.5 hours prior to launch for weigh-in. The current prediction is for a short flight to the north.


Please keep watching this website for updates. Predictions are now updating daily (about 1pm). Click on the link below (or here) to view the prediction information.

Payload plans have been updated as we learn better payload mass estimates..

The collection of links shown at this page gives you prediction, weather observations, and tracking links for the flights on 7/29.

  • Two Exempt balloons supporting two one-week CU Science Discovery workshops.
  • One Exempt balloon to refly the Metro State University Sunkist and Deadeye experiments.

Predictions are located here.

 EOSS Member Mileage Reimbursement 

Event Date: 
Saturday, July 29, 2017 - 00:00
Flight Coordinator: 
Launch Site: 
Punkin Center, X 80, Y 20, Test N 39.0000, W 104.0000  X 64.0 Y 30.2


Exempt balloon with two CU Science Discovery payloads and a CU Grad Student 360 degree video payload


Balloon Type: 
1500g Totex latex balloon
9 foot Rocketman High Altitude Balloon Payload Recovery Parachute
144.340 MHzAEØSS-7APRSPrimary Beacon, Timeslotted at 0:00 and 0:30
144.950 MHzKEØBMV-11APRS / DFSecondary Beacon
145.750 MHzKCØD-15APRS / DF / Cutterqualificaiton
Iridium Tracker


Exempt Balloon with CU Science Discovery payloads and the CU Science Discovery GoPro payload

Balloon Type: 
1500g Totex latex balloon
5.8 ft orange and white nylon parachute with spreader ring
144.340 MHzAEØSS-12APRSPrimary Beacon, Timeslotted at 0:10 and 0:40
147.555 MHzKCØD-14APRS / DF / CutterSecondary Beacon
144.360 MHzKCØD-11APRSqualification


Exempt balloon reflying two Metropolitan State University payloads

Balloon Type: 
2000g Totex latex balloon
8.5 ft circumference Sphereachute with cutter and fast release
144.340 MHzAEØSS-13APRS / Digi (EOSS)Primary Beacon, Timeslotted at 0:20 and 0:50
145.570 MHzKCØD-12APRS / DF / CutterSecondary Beacon

Preflight Net:

  • 147.225 MHz CRA Repeater (107.2 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the CRA machine is down
  • 146.640 MHz (100 Hz Tone) DRL will serve as a backup frequency

Recovery Operations:

  • 448.450 MHz PPFMA (100.0 Hz Tone)
  • 446.100 MHz Field Simplex, EOSS #257
  • 446.150 MHz Field Simplex, EOSS #258
  • 446.200 MHz Field Simplex, EOSS #259
  • 446.275 MHz Student Travel Simplex
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 446.050 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
TacticalCall SignNameNotesTrackPoint Xmit Time Slots
AlphaWAØGEH, KCØDMarty, MarkEOSS #257/258, Alpha4 minutes @ 12 seconds
BravoKDØSEMDaveEOSS #257/259, Tracker4 minutes @ 17 seconds
CharlieKCØRPS, WØNFWJim, GeorgeEOSS #2584 minutes @ 22 seconds
DeltaKØSCC, NØIXStephen, DougEOSS #2594 minutes @ 27 seconds
EchoKØLOBJimEOSS #2584 minutes @ 32 seconds
FoxtrotNØNDMLarryEOSS #2594 minutes @ 37 seconds
4 minutes @ 37 seconds
HotelN7JJYGeorgeOnly if Windsor Launch4 minutes @ 47 seconds
TangoKCØLJohnTexas Predictions
TR Breakfast: 
Note the 8:30 launch times for these high school students... Assuming a Limon launch, breakfast will be 7:15 at Denny's, leaving Denny's to track at 8:00. The grids and tests are the same as last flight. More later...