EOSS Flight Archives

EOSSP-5 Peace with Christ Christian School Pico Balloon - Recap

KCØRPS's picture
Submitted by KCØRPS on Fri, 05/01/2026 - 22:13

EOSSP-5 was launched on Monday, May 4, 2026 (Star Wars Day) from Peace with Christ Christian School in Aurora, Colorado. After an initial tangle around the launch staff, the balloon floated up over the students and off to the east. 

To monitor the balloon, follow this link: https://aprs.fi/#!call=a%2FEOSSP-5&timerange=3600&tail=3600

EOSS-398/399/400 Littleton EPIC Program & MSU Launch - Recap

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Submitted by KCØRPS on Fri, 04/24/2026 - 11:44

A perfect day for the launch of 2/1500g and 1/3000g balloons carring student payloads from both Littleton Epic and MSU.  The parking lot at Deer Trail School was full of cars, students and parents. The predicted landing sites were near Limon, a short drive from Deer Trail.

EOSS-396/397 MetroState Intro2Space - Recap

KCØRPS's picture
Submitted by KCØRPS on Mon, 04/13/2026 - 12:01

On Sunday, April 19, 2026, we launched two 3000g latex balloons carrying a total of 17 experiments for MSU-Denver's Intro2Space program.  All payloads were recovered successfully. A detailed recap of the day's events will be posted soon.

 

EOSS Members: Please submit your mileage for reimbursement here: https://forms.microsoft.com/r/wKHQHifSjL?origin=lprLink

EOSS-394/395 Gateway to Space & NDIA - Recap

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Submitted by KCØRPS on Sun, 04/05/2026 - 13:09

The Saturday flight was delayed one day because of high ground winds and an extended predicted flight path. On Sunday, April 12, 2026, one 1500g balloon carrying student experiments sponsored by the Rocky Mountain Chapter of the National Defense Industrial Association and one 3000g balloon carrying student payloads from CU-Boulder's Gateway to Space program were flown. Both balloons landed approximately 19 miles NNE of Anton, Colorado. The flights were as follows:

EOSS-392/393 COSGC Spring Flight - Recap

KCØRPS's picture
Submitted by KCØRPS on Sun, 03/22/2026 - 14:31

EOSS 392, 393 Heavies Rev B has new tops and bottoms. EOSS 392. 392, 394 Lites Rev A overweight waiting for final weights on April  1. We may have to drop some payloads.  This will be two 3000g balloons or three 1500g balloons carrying student payloads for the Colorado Space Grant Consortium program.   If clouds prevent the launch of 3000g balloons, the payloads will be separated and launched as 3, 1500g payloads.

Flight prediction: https://eoss.org/predict.

EOSS-391 - Qualification Flight - Recap

Nancy Koos K0NKK's picture
Submitted by Nancy Koos K0NKK on Wed, 02/25/2026 - 12:12

One 2,000g balloon was launched on March 21, 2026 from Deer Trail Colorado with EOSS qualifying payloads and a new ADS-B built by Metro State University - Denver.  The balloon was launched at 8:00am with the help of members from the Parker Radio Club. The balloon reached an altitude of 91,900 ft when it burst.  Trackers were talking to the landowner (just north/east of Arabia) as the parachute and payloads landed about 50 ft from the driveway they were standing in.  One of the easiest recoveries!

EOSS-388/389/390 Ranum Innovation, Golden HS, and Evergreen HS - Recap

Nancy Koos K0NKK's picture
Submitted by Nancy Koos K0NKK on Mon, 11/17/2025 - 21:25

Three 1500g Lite balloons were launched from Deer Trail on Saturday, December 6, 2025. The upper level winds were higher than expected and the real-time landing predictions were putting the balloons across the state line in Kansas. Ultimately the balloons did land in Colorado and were easily retrieved once landowner permission was obtained. The balloons performed as follows:

EOSS-386/387 COSGC Fall Flight - Recap

Nancy Koos K0NKK's picture
Submitted by Nancy Koos K0NKK on Sun, 11/02/2025 - 17:27

Two 3,000g balloons were successfully launched on November 8, 2025, a breezy Saturday morning from Wiggins High School.  The first balloon 386 launched at 6:47am reaching an altitude of over 100,000ft. The second balloon burst upon filling, and a backup balloon was successfully filled with 387 being launched after 7 am reaching an altitude of over 80,000'.

EOSS-384/385 Metro State University - Intro2Space - Recap

KCØRPS's picture
Submitted by KCØRPS on Wed, 10/29/2025 - 12:43

On Sunday, November 2, 2025, two 3000g balloons were launched from Wiggins High School, carrying fourteen Metro State University Intro2Space payloads. Because of an excessive long prediction for Saturday, the flight was delayed until Sunday. The weather was cool but managable. The balloons flew as follows:

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Recaps for EOSS-195 (April 2014) and earlier are on the old recap page