EOSS-226 Colorado Space Grant Demosat Flight - Recap

Douglas County STEM School and Acadamy has created a great 6-minute video, located at https://www.youtube.com/watch?v=tr-glqCw7Z0

NØLP has created a Launch Video, located at located at https://youtu.be/ee3EC3yip9U



EOSS-226 flew as a single 3000g balloon carrying:

  • Seven Colorado Space Grant Consortium payloads
  • One Douglas County STEM School and Acadamy payload
  • KCØD-11 beacon for flight quailication.

The flight reported a maximum altitude of 104,749 ft and was easily recovered 138 yards north of Elbert County Road 30 east of County Road 173, 21.2 miles downrange. This landing was 9.6 miles southwest of the original prediction. Landing was at 38.96967, -103.86517.

 Flight Summary

  • Flight Number: EOSS-226
  • Launch Location: Limon Launch Site
  • Launch Time : 07:01 (hh:mm)
  • Flight Time: 02:21 (hh:mm)
  • Average Ascent Rate: 960 ft/min
  • Maximum GPS Altitude: 104,749 feet
  • Flight Distance: 21 miles
  • Maximum Speed: 85 mph

 EOSS members may claim mileage at https://goo.gl/forms/q0FR9zucgc7sGPZL2.

Original Announcement: 

WE ARE GOOD TO GO for a Saturday Launch!! The launch is scheduled for 7:00am from the Limon Ball Fields (see the directions by clicking on the preceeding blue text). The cloud cover is such that we should be able to fly all the payloads together on one large balloon. A final check will be made early in the morning.

Payload weigh-in and stringing will start at 6:00am, please plan on having your payloads at the site at that time. Please note that it is an approximately 1.5 hour drive from the intersection of 1-25 and I-70 (the mousetrap) to the launch site. Plan accordingly.

This is a Colorado Space Grant Consortium Demosat flight. We are going to try to launch one 3000g balloon, but if the weather (cloud cover) does not cooperate, we will be prepared to launch two 1200g balloons that will not be limited by cloud cover. Three payload plans are attached below, two for EOSS-226 covering both options, and one payload plan for EOSS-227 (if needed). The launch has been moved to the Limon Ball Field site.

Weather and flight path predictions are posted here. These will be updated starting two week before the launch and will be updated daily. A number of usefull links are collected here. This site has several links that will be active only during the flight and several links that show predictions and weather observations that are relevant to this flight.

Event Date: 
Saturday, July 30, 2016 - 00:00
Flight Coordinator: 
Launch Site: 
Punkin Center, X=30,Y=10 Test N39.070, W103.750 = 27.4, 25.0


This will likely be a 3000g balloon with all of the CSGC Demosats (payload plan posted below). If cloud cover does not allow, it will be one of two 1200g balloons that can be flow through cloud cover (1200g balloon payload plan posted here).

Balloon Type: 
3000g Latex
10 foot nylon parachute with fast release
145.600 MHzKE0BMV-11APRS/DF/Cutter
144.340 MHzAE0SS-12APRS/DigiTime Slotted at :00 and :30


This is an optional 1200g balloon that will carry half of the CSGC Demostats if we fly two balloons through cloud cover that prevents flying one 3000g balloon.

Balloon Type: 
1200g Latex
5.8 foot nylon parachute with fast release
147.420 MHzKØSCC-11APRS/DF/Cutter
144.340 MHzKCØUUO-11APRSTimeslotted :15 and :45

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) Changed!!!  This is a better option!!
  • 449.450 MHz RMRL (103.5 Hz Tone)
  • 446.100 MHz Field Simplex for EOSS 226
  • 446.150 MHz Field Simplex for EOSS 227
  • 446.050 MHz Backup field simplex
  • 449.275 MHz Car to Car drive out frequency

Launch Site Simplex: 446.050 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
TacticalCall SignNameNotes
AlphaWAØGEH, KCØDMarty, MarkTracking Coordinators
BravoW9CN, KBØYRZMike, ChrisAlt. Alpha, Tracker
CharlieKDØSEM, KEØCQQ Dave, RyanLaunch Team, Tracker (All Stars)
DeltaKØSCC, KEØBMVStephen, ParkerLaunch Team, Tracker, College Man
EchoKCØRPS, WØNFWJim, GeorgeFlight Coordinator, Tracker
FoxtrotNØNDM, WØCBHLarry, BenjieLaunch Team, Tracker
TR Breakfast: 
T&R Breakfast will be at Denny's in Limon at 6:00. Be sure to load Limon as a launch site by modifying your Locations.dat file in TrackPoint. This from Nick's 5/18 message: A. Open TrackPoint. B. Open the Setup form. C. You should be on the Launch/Grid/Pred tab. If not, go to that tab. D. Click on the little blue square beside Launch Site dropdown menu window. E. The Locations.dat File will open in Notepad. F. The new entry is: Limon,N,39,14.204,W,103,41.822,5383 G. After the addition is done and checked, save the file. H. Close TrackPoint and restart to acquire your changes. Depending on cloud conditions, if unfavorable, then we will fly two balloons. Set up TrackPoint to accommodate the second balloon if necessary. Enjoy this flight and be safe! Marty