EOSS-273 Metro State University - Recap

EOSS-273 with ten Metro State Space Demo Sats and CU Gateway to State payloads weighting 19.3 pounds, two GPS-equipped radio beacons, and a 12 ft. Rocketman parachute were launched on a 3000 gram balloon from the Wiggins, CO launch site (N40° 13.747', W104° 4.517') at an elevation of 4,542 feet at 07:21:45 AM MDT on Mar. 17, 2018.  The last packet received before balloon burst was at 8:48 AM at an altitude of 102,446 ft. after an ascent averaging 775 ft./min.  The maximum recorded speed was 131 mph at 7:41 AM at an altitude of 31,500 ft. on ascent.   The parachute and flight string touched down at 9:28 AM at N39° 33.22', W102° 36.33' and were recovered at an elevation of 4,222 ft. after a flight lasting 2 hr. and 6 min.  The horizontal touchdown speed was 3 mph and the vertical speed was 572 ft./min.  The touchdown point was about 15 miles east of the town of Cope, CO (N39° 40.045', W102° 51.056').  The straight line distance between launch and touchdown was 90.7 miles.   NØLP


Original Announcement: 

(Saturday Afternoon) The launch is on for Sunday April 15 at 7:15am from Wiggins Colorado. One single Heavy balloon is anticipated. The landing site (see GIF file on prediciton page) experienced a blizzard yesterday and is still experiencing high winds. At this time, some roads are closed, but the winds are forecast to die down during the night. Hopefully the roads will all be passable on Sunday morning. If travel is too dangerous, arrangements will be made to recover the payloads and meet the students at a safe location, but most likely the students will be able to drive to the landing site for payload recovery.

Directions to the launch site are posted here and here is a printable set of directions.

Daily predictions (which are available here) have indicated that this is necessary.

Payload Plans have been revised to Rev D to incorporate final payload masses Thank you to Metro State Univ for including two CU Gateway to Space payloads.

One 3000g balloon (Heavy) carrying payloads from Metro State Univeristy's Into to Space program.

To monitor the flight or to check the weather observations prior or during the flight use these links http://wxqa.com/eoss273.html

Click here for live flight tracking.



EOSS Mileage Reimbursement https://goo.gl/forms/1gHbiMs5drYX4d773

Event Date: 
Sunday, April 15, 2018 (All day)
Flight Coordinator: 
Launch Site: 
Last Chance 20,50 Test N39.500 W103.500 ans: 25.0, 33.5


This is one Heavy balloon carrying all the Metro State Intro to Space BalloonSats. If the cloud cover is greater than 5/10ths, the we will need to fly two Lite balloons, splitting the payloads by class. The Lite payload plans are here:

Balloon Type: 
3000g Totex Laytex
12 foot Rocketman
Tracking Beacons
144.340 MHzAEØSS-13APRS/Digipeater EOSSPrimary Beacon, Timeslotted :10 and :40
145.535 MHzKCØD-15APRS/DF/wireless releaseSecondary Beacon and release

Preflight Net:

  • 449.225 MHz RMHAM Repeater (141.3 Hz Tone) 8 pm MDT preceding night
  • 146.940 MHz (103.5 HZ Tone) RMRL Repeater if the RMHAM 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), Primary
  • 449.450 MHz RMRL (103.5 Hz Tone), Alternate
  • 446.100 MHz Balloon 1 Field Simplex
  • 446.200 MHz "Air One", Metro State University
  • 446.275 MHz Car to Car drive out
  • 146.550 MHz Backup field simplex

Launch Site Simplex: 446.050 MHz

HF - Possible ops: 7.235 LSB

Tactical Calls: 
TacticalCall SignNameNotes
AlphaWA0GEH, KC0DMark, Marty10:02, Tracking Coordinators
BravoW9CN, K0YRZMike, Chris10:07 Backup Alpha Trackers
CharlieKD0SEMDave10:12 Launch, Tracker
DeltaK0SCCStephen10:17 Launch, Tracker
EchoK0LOBJim10:22 Tracker
FoxtrotN6BAJeff10:32 Tracker
TangoKC0LJohn10:37 Tracker
HotelKE0ORBJohn, Nancy10:42 Tracker
IndiaKE0NDWAnup plus C-Base Team10:47 Tracker
JulietKB0UBZBen10:52 Tracker
KiloKC0RPSJimFlight Coordinator, Tracker. Students
Air OneKE7KCKTom, Jenna (pilot), Andy (co-pilot)30 seconds: 27 Air Tracker Cessna 182
TR Breakfast: 
Flight prediction is 96 miles downrange. Breakfast location in ## Change ## Denny's Limon, 6:00, Leave at 6:45 for recovery site. Report road conditions. Intentions to send students to ## Change ## Yuma and move from there. Be prepared to start with the PPFMA 448.450 repeater with the PPFMA 448.450 repeater as an alternative. The predicted landing site is out of range for both repeaters. We will use 446.100 MHz for voice communications. Metro State University will be flying tactical "Air One" with Tom, KE7KCK running APRS in the back seat. Tom will communicate on 446.200 simplex and whatever repeater we will be using. Air One will fly over the launch and the landing and will park during the middle part of the flight. It is good to be an aviation university! For TrackPoint 1.44 users, beacons can be time slotted. As an example, the trackers entry 10:22 means to beacon every 10 minutes at 22 seconds past the minute. Dress warm and stay on the roads. Please advise of road conditions so decisions can be made regarding student travel.