EOSS-306 Westminster High School CTE Aerospace Program - Recap




A great flight summary video is now available at  https://www.youtube.com/watch?v=hzHHmP0eE7k

A single 1500g balloon was launched from Deer Trail School at 0828 MST on Saturday January 16, 2021. The balloon reached an altitude of 89,821 feet and was recovered near Punkin Center, Colorado. The balloon carried 12 experiments for the Career & Technical Education Aerospace program. Launch was in a 5 mph wind and snow squall and the landing was in a 15 mph ground wind that resulted parachute-dragging of the payloads across the prairie for 950 feet. Analysis of the payloads will tell us how much damage was incurred.

Mileage link for EOSS members: https://forms.gle/KereEEuGn7LQSTR86

Launch 15:28:00 UTC		 5,243 Ft		39.607680, -104.041120
Burst  16:42:54 UTC		89,821 Ft		39.153165, -103.724806
Landed 17:21:30 UTC		 4,867 Ft		38.871286, -103.503526

Minimum outside temperature: -74.5 F at 64,500 Ft on decent


Original Announcement: 

We look good for a Saturday Launch from Deer Trail School. Please look at the maps and instructions on how to get to the Deer Trail School (it is not obvious when you get off of I-70 at the Deer Trail Exit). Remember you can monitor the flight from home, or on your smart phone in the field, at https://track.eoss.org

Daily predictions have started posting at www.eoss.org/predict . Look at the GIF file for EOSS-306, Saturday 1/16, for Deer Trail.

  • 12-12-2020 Payload Plan Rev A posted
  • 12-23-2020 Comms Plan updated
  • 01-13-2021 Payload Plan Rev B posted
  • 01-15-2021 Payload Plan Rev C posted

One 1500g balloon carrying payloads for two Aerospace classes.

The planned launch site is the Deer Trail School, located in Deer Trail, Colorado. Launch location and/or launch date may change based on predicted wind and weather. Watch his website for changes.

Predictions are shown here and will be updated around noon daily starting 15 days before the flight.

Event Date: 
Saturday, January 16, 2021 - 00:00
Flight Coordinator: 
Launch Site: 
Punkin Center  X 40 Y 30, Test N 39.000 • W 104.000 X 24.0 Y 40.2

EOSS-306 Lite

Balloon Type: 
Totex 1500g Latex
10 ft Rocketman
144.340 MHzAE0SS-12APRS/Digi EOSSAprimary, Timeslotted at 0:27 and 0:57
145.645 MHzKC0D-14DF/Wireless Releasesecondary
144.905 MHzKC0D-3Firmware Qualification
Payload Plan: 


Preflight Net: 
Friday January 15th @ 7PM (19:00)
449.225 minus offset with a 141.3 Hz tone "Fun Machine” Node 1961.

Analog T&R Repeater:
PPFMA 448.450 minus offset with 100 Hz tone (linked to 146.97 with EchoLink support).
RMHAM DMR “Wide" along with deployable(s) have been approved for EOSS 306.  We will be using “Central East” zone and “Wide” talk group.  W9CN will have EOSS#1 Deployable repeater operating from his truck.

The Usual EOSS Simplex Frequencies (UESF) will be used:

  • Ground Station               446.050
  • EOSS 306 T&R             446.100
  • Backup T&R                  446.150
  • Spare T&R                     446.200
  • Car to Car drive out      446.275 

Thanks to all of the Resources Owner/Managers for the use of these systems.  

2M Direction Finding (Beacon) Frequencies:

  • 144.340 MHz
  • 144.905 MHz
  • 145.645 MHz


Tactical Calls: 
TacticalCall SignNameNotes
BravoW9CN, KD7JNQ, N0JPSMike, Kraig, John
CharlieKC0RPSJim, Flight Coordinator
DeltaK0SCC, KE0BMUStephen, WhitneyLaunch then track
EchoKE7KCKTom, PresidentLaunch then track
GolfK0JWB, K0NKKJohn, Nancy
Ground StationN2XGL, K5JK, NOCALLJeff, Tom, RandyProvides updated predictions, FAA coordination
WhiskeyKD0NRYChrisCU Spacegrant
FoxtrotKB0YRZChris, JenPueblo Chamber of Commerce
JulietN0NDMLarryLaunch,then track
KiloKB0UBZ, KA0ZFIBen, Ann
LimaK0BRA, N0RPFDoug, Rob
TangoKC0LJohnFrom Texas, provides updated predictions
TR Breakfast: 
Optional T&R breakfast will be at the IHOP at the Flying J Truck stop in Limon at 7:30 AM. We will be traveling SE down highway 287 from Limon. This is a major truck route and is a very busy, high speed highway. Do not park on this highway. Look for instructions from Alpha for a staging/parking place. Wear your yellow vests when leaving your vehicle. Remain in contact with Alpha whilst in the field (446.100 MHz. simplex). Station Tango, KC0L, will be providing updated predictions from Texas during the flight.