EOSS-292 Colorado Space Grant Consortium Summer Flight - Recap

EOSS-292 with four University of Colorado Space Grant payloads and a University of CO ADS-B beacon under development totaling 8.27 pounds, three GPS-equipped radio beacons, and a 12-foot Rocketman parachute were launched on a 3000 gram balloon from the Limon, CO launch site (N39° 14.16', 104° 4.517') at an elevation of 5,388 feet at 07:39:10 AM MDT on July 27, 2019.  The last packet received before balloon burst was at 9:23 AM at an altitude of 107,050 ft. after an ascent averaging 977 ft./min*.  An interesting event happened on this flight with regard to the maximum recorded speed of the flight string.  Two of the flight string’s three GPS's recorded speeds of 54 mph three time:  twice at around 106,000 ft.  (106,087 and 106,214) at about 9:22 AM very near burst and once at 45,019 ft. at 9:38 AM on descent.  This is the first time since flight summaries have been posted that the maximum speed occurred above 100,00 ft.  A max speed in the 40,000 ft. range is normally what occurs.  This is because the jet stream is usually at its strongest around this altitude.

The parachute and flight string touched down at 10:07 AM at N39° 4.63', W103° 59.35' at an elevation of 6,179 ft. after a flight lasting 2 hr. and 41 min.  The horizontal touchdown speed was 12 mph and the vertical speed was 888 ft./min.  The touchdown point was about 19 miles from the launch site and seven miles south of the town of Matheson, CO (N39° 10.404', W103° 58.59').  The flight string and the parachute were easily recovered by the students and the EOSS team in a wind turbine farm just off Elbert County Road 999.  (Checkout the pics further down on this web page.)  The straight-line distance between launch site and touchdown was 6.7 miles, although the map below shows the actual flight path to be much longer.  NØLP

*  On this flight there were three transmitting APRS beacons.  Through some clever work KBØTVJ and his son were about to construct a single ASCII text file with all the beacons packets in it sorted by packet transmit time.  This file was used for this flight summary.  Therefore, the most appropriate packet for a specific flight characteristic, e.g., max altitude, was used.




 EOSS members use this link for mileage reimbursement: https://goo.gl/forms/V7r4DKZyEpod5auj1 Please submit reimbursement request within seven days of the flight. If longer, please notify the club treasurer that an additional request has been submitted.


Original Announcement: 

Update 7/26/19 1145: Revision E to EOSS-293 Heavy posted. Corrected student weight notations.Launch site is LIMON. Note the frequency change to the pre-flight net. We will fly AE0SS-13 if single heavy balloon to test the Digi capability.One 3000 gm balloon, If cloud cover prevents launching heavy, we will fly 2 balloons.  Note that the lite balloon beacons are reversed (ie 292H->293L) *NEW* Live tracking of the balloon is available here.  Instructions on how to use the tracker can be found here.  Flight prediction is shown here.

Event Date: 
Saturday, July 27, 2019 - 00:00
Flight Coordinator: 
Launch Site: 
Punkin Center: X=45 Y=25 Test N 39.000, W 104.000 Ans: 29.0, 35.2

EOSS-292 Lite

Balloon Type: 
1500g latex
12 ft Rocketman Orange/Green
144.905KC0D-1APRS/Release/DFTop of record; Release Baker
144.340AE0SS-13APRS/DigiSlotted 25/55

EOSS-292 Heavy

Balloon Type: 
3000g latex
12 ft Rocketman Orange/Green
145.710 MHzKC0D-15APRS/Release/DFTop of record; Release Adam
144.340 MHzAE0SS-12APRS/DigiBottom of Record; Slotted 10/40
144.340 MHzAE0SS-13APRS/DigiUnder test for Digi; Slotted 25/55

EOSS-293 Lite

Attached is the correct payload plan for the flight on 10/12.

Balloon Type: 
1500g latex
12 ft Rocketman Orange/Green
144.905 MHzKCØD-1DF / Remote Releasesecondary beacon
144.340 MHzAEØSS-13APRS / Digi EOSSprimary beacon, timeslotted at 0:10 and 0:40

EOSS Preflight Net @ 8 PM MDT preceding night:
        • 448.225 MHz (-5 MHz Offset, 141.3 Hz Tone )  RMHAM Repeater  Note frequency change!!!
        • 146.940 MHz (-600 KHz Offset, 103.5 Hz Tone) RMRL Repeater if the RMHAM machine is down
        • 146.640 MHz (-600 KHz Offset, 100.0 Hz Tone) DRL Repeater will serve as a backup to the backup repeater 

Launch Site:
        • 446.050 MHz Simplex  
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

Track & Recovery Operations:
        • 449.450 MHz (-5 MHz Offset, 103.5 Hz Tone) RMRL repeater (Assuming we are flying out of Windsor).
        • 448.450 MHz (-5 MHz Offset, 100.0 Hz Tone) PPFMA repeater (Assuming we are flying out of Deer Trail, Limon or Genoa).

        Simplex Frequencies:
        • 446.100 MHz Balloon #1 Field Simplex 
        • 446.150 MHz Balloon #2 Field Simplex
        • 446.200 MHz Balloon #3 Field Simplex
        • 446.275 MHz Car to Car drive out Simplex
        (Note that some radios assume these are repeater frequencies and attempt to put a 5 MHz offset in the transmit frequency automatically)

        Legacy 2M Simplex Frequency (not generally used due to desense/interference issues with the 2M APRS packets)
        • 146.550 MHz Simplex

DMR Via the RMHAM DMR System:   https://www.rmham.org/wordpress/dmr-radio-site-information/

                • DMR “Wide” has been approved by RMHAM for the full flight.

                • NOTE: DMR “Central” is being used by a special event in Rangley, Colorado on Saturday.

2M Direction Finding Frequencies:

  • 144.340
  • 144.360
  • 144.905
  • 145.535
  • 145.645
  • 145.710
  • 145.765


Tactical Calls: 
TacticalCall SignNameNotes
AlphaWA0GEH-9, KC0D-9Marty, Mark, Wyatt, Cash, DamianTracker Coordinators
BravoW9CN, KB0YRZ, N0JPSMike, Chris, JohnTrackers, Alpha Backup
CharlieKE7KCKTomFC, Tracker
DeltaK0SCC, KE0BMVStephen, ParkerLaunch, Trackers
EchoKC0RPS, W0NFWJim, GeorgeLaunch, Tracker
FoxtrotKD0SEMDaveLaunch, Tracker
GolfK0JWB, K0NKKJohn, NancyTracker, Photograher
HotelWG0EColinTracker, Sunday. Only
IndiaKE0GKIBernadetteCU Project Director
JulietN6BAJeffTracker, SDR Wizard
Ground StationN2XGL, KB0TVJJeff, Russ, RandyGround Station, ADS-B Rec.
TangoKC0L-9, N0LPJohn, NickTrackers
TR Breakfast: 
IHOP Limon, 5:45. Meet Bravo team if you can stand to watch them eat:>)