EOSS Flight Archives

EOSS-405 Colorado Space Grant Consortium Summer Flight - Recap

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Submitted by KCØRPS on Sat, 07/25/2026 - 17:14

Saturday, August 22, at 6:55 a.m., EOSS launched EOSS-405 a 3,000 g balloon with 8 payloads from students participating in the Colorado Space Grant Consortium program. This summer's students were from Arapahoe Community College, CU Boulder, CU Colorado Springs, and Pikes Peak. The launch site was the Limon Softball Field. The balloon ascended to an elevation of 107,526 ft (Close to a record!), landing south of Limon, CO, about 1mile west of Highway 71. The crossroads were N/S CR201 and E/W CR34.Students started arriving at the Limon Softball in Limon, CO at 4:30 am.

EOSS-404 BAE BIRST - Recap

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Submitted by KCØRPS on Thu, 07/09/2026 - 19:31

One 3000g balloon was launched from Genoa Colorado at 7:12 am on July 25, 2026 carrying five payloads built by BAE Systems' BIRST intern program. Three of the payloads were intended for a rocket launch, but high fire danger prevented the use of that vehicle. The three payloads were added to the balloon launch. The payload teams camped overnight at the site in Genoa and assisted in the balloon launch. The balloon ascended to approximately 67,700 feet and birst earlier than expected. The payload string descended under a 12 foot parachute and landed on a ranch southwest of Arriba Colorado.

EOSSP-6 EOSS 400th Celebration Pico Balloon - Recap

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Submitted by KCØRPS on Wed, 06/10/2026 - 17:22

On Saturday July 11, 2026 EOSS launched pico balloon EOSSP-6 from Castlewood Canyon State Park in Douglas County, Colorado. This is a 2 meter APRS beacon that transmitts on 144.390 MHz and 144.340 MHz. This can be tracked directly on http://aprs.fi/ae0ss-9 using the beacon call sign (not the flight number like the other EOSS pico balloons). 

The balloon was launched as part of the EOSS-400 celebration picnic, honoring the many EOSS members that have accomplished 400 successful balloon flights.

The pico balloon equipment includes:

EOSS-403 Great Plains Superlaunch - Recap

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Submitted by KCØRPS on Mon, 06/08/2026 - 12:05

On June 20, 2026 a 1500g balloon was launched as part of the Great Plains Superlaunch mass launch from Pella, Iowa. The balloon reached an altitude of 101,342 ft, burst, and descended into power lines near West Point, Iowa. 

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

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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.  On May 2, 2026, 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

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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

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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.

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