Dave VE3KCL was the first person to use QRP Labs kits based on the Ultimate3S kit for high altitude "floater" balloon tracking. These flights use a special firmware version which carries additional telemetry over the WSPR network. The Flight S-4 page has a full explanation of this.
Flight listing
Click the flight name in this table to go to the flight's page.
| Flight name |
Operator | Launch date |
Duration | Altitude | Distance | Comments |
| U4B-27 | Dave VE3KCL | Pending | ||||
| U4B-26 | Dave VE3KCL | Pending | ||||
| U4B-25 | Dave VE3KCL | Pending | ||||
| U4B-23 | Dave VE3KCL | Pending | ||||
| U4B-22 | Dave VE3KCL | 19-Aug-2021 | ||||
| U4B-21 | Dave VE3KCL | 30-May-2021 | ||||
| U4B-20 | Dave VE3KCL | |||||
| U4B-19 | Dave VE3KCL | |||||
| U4B-18 | Dave VE3KCL | |||||
| U4B-17 | Dave VE3KCL | |||||
| U4B-16 | Dave VE3KCL | |||||
| U4B-15 | Dave VE3KCL | |||||
| U4B-14 | Dave VE3KCL | |||||
| U4B-13 | Dave VE3KCL | |||||
| U4B-12 | Dave VE3KCL | 22-Sep-2020 | ||||
| U4B-11 | Dave VE3KCL | 15-Sep-2020 | 2 days | 12,000m | ||
| U4B-10 | Dave VE3KCL | |||||
| U4B-9 | Dave VE3KCL | 16-May-2020 | ||||
| U4B-8 | Dave VE3KCL | 13-May-2020 | ||||
| U4B-7 | Dave VE3KCL | 27-Apr-2020 | ||||
| U4B-6 | Dave VE3KCL | 18-Apr-2020 | 58 days | ~11,500m | 141,329km | Almost 4 circumnavigations |
| U4B-5 | Dave VE3KCL | Pending | No reports received after the first day | |||
| U4B-4 | Dave VE3KCL | 24-Mar-2020 | No reports received after the first day | |||
| U4B-3 | Dave VE3KCL | 15-Mar-2020 | No reports received from U4B-3 | |||
| U4B-2 | Dave VE3KCL | 01-Mar-2020 | ||||
| U4B-1 | Dave VE3KCL | 08-Feb-2020 | ||||
| STELLA22 | Daniel DL6OW | Pending | ||||
| STELLA21 | Daniel DL6OW | Pending | ||||
| STELLA20 | Daniel DL6OW | Pending | ||||
| U3B-28 | Dave VE3KCL | |||||
| STELLA19 | Daniel DL6OW | 08-Jun-2019 | ||||
| U3S-33 | Jim N2NXZ | 27-May-2019 | ||||
| U3B-27 | Dave VE3KCL | 15-MAy-2019 | ||||
| U3S-32 | Jim N2NXZ | |||||
| U3B-26 | Dave VE3KCL | Pending | ||||
| U3S-31 | Jim N2NXZ | 10-Apr-2019 | ||||
| U3S-30 | Jim N2NXZ | 19-Mar-2019 | 4.5 hours | 420km | ||
| U3S-29 | Jim N2NXZ | 08-Mar-2019 | 6 hours | ~11,000m | 257km | Custom envelope, burst at altitude |
| U3B-25 | Dave VE3KCL | 28-Feb-2019 | ||||
| STELLA15 | Daniel DL6OW | Pending | ||||
| U3S-26 | Jim N2NXZ | Pending | ||||
| U3B-24 | Dave VE3KCL | Pending | ||||
| U3B-23 | Dave VE3KCL | Pending | ||||
| U3B-22 | Dave VE3KCL | Pending | ||||
| U3S-25 | Jim N2NXZ | Pending | ||||
| U3B-21 | Dave VE3KCL | Pending | ||||
| STELLA13 | Daniel DL6OW | Pending | ||||
| U3B-20 | Dave VE3KCL | Pending | ||||
| U3S-24 | Jim N2NXZ | Pending | ||||
| U3B-19 | Dave VE3KCL | Pending | ||||
| U3B-18 | Dave VE3KCL | Pending | ||||
| U3B-17 | Dave VE3KCL | Pending | ||||
| U3B-16 | Dave VE3KCL | Pending | ||||
| U3B-15 | Dave VE3KCL | Pending | ||||
| U3S-23 | Jim N2NXZ | Pending | ||||
| U3S-22 | Jim N2NXZ | Pending | ||||
| U3B-14 | Dave VE3KCL | Pending | ||||
| U3S-21 | Jim N2NXZ | Pending | ||||
| BB05 | Bob ZL1RS | Pending | ||||
| BB04 | Bob ZL1RS | Pending | ||||
| U3B-13 | Dave VE3KCL | Pending | ||||
| BB03 | Bob ZL1RS | 07-Jan-2018 | 2 days | 10,460m | 1,826km | |
| STELLA10 | Daniel DL6OW | |||||
| BB02 | Bob ZL1RS | 17-Dec-2017 | 9 days | ~9,500m | 24,320km | |
| BB01 | Bob ZL1RS | 08-Dec-2017 | ||||
| U3S-20 | Jim N2NXZ | Pending | ||||
| STELLA9 | Daniel DL6OW | Pending | ||||
| U3B-12 | Dave VE3KCL | Pending | ||||
| STELLA8 | Daniel DL6OW | Pending | ||||
| STELLA7 | Daniel DL6OW | Pending | ||||
| U3B-11 | Dave VE3KCL | Pending | ||||
| STELLA6 | Daniel DL6OW | Pending | ||||
| U3B-10 | Dave VE3KCL | Pending | ||||
| U3B-9 | Dave VE3KCL | Pending | ||||
| U3S-19 | Jim N2NXZ | Pending | ||||
| U3B-8 | Dave VE3KCL | Pending | ||||
| U3B-7 | Dave VE3KCL | Pending | ||||
| U3B-6 | Dave VE3KCL | Pending | ||||
| U3S-18 | Jim N2NXZ | Pending | ||||
| U3S-17 | Jim N2NXZ | Pending | ||||
| U3S-16 | Jim N2NXZ | Pending | ||||
| U3S-15 | Jim N2NXZ | Pending | ||||
| U3B-5 | Dave VE3KCL | Pending | ||||
| U3B-4 | Dave VE3KCL | Pending | ||||
| U3B-3 | Dave VE3KCL | Pending | ||||
| U3S-14 | Jim N2NXZ | Pending | ||||
| U3S-13 | Jim N2NXZ | Pending | ||||
| U3B-2 | Dave VE3KCL | Pending | ||||
| U3B-1 | Dave VE3KCL | 16-Jun-2017 | 2 day | >10,000m | First U3B test flight... GPS failed over 10km | |
| S-26 | Dave VE3KCL | Pending | ||||
| U3S-12 | Jim N2NXZ | 08-Jun-2017 | 1 day | >9,000m | 955km | |
| S-25 | Dave VE3KCL | 02-Jun-2017 | ||||
| U3S-10-2 | Jim N2NXZ | 28-May-2017 | 6 days | 10,260m | 3,253km | |
| U3S-11 | Jim N2NXZ | 23-May-2017 | 1 day | 10,080m | 2,429km | |
| S-24 | Dave VE3KCL | 10-May-2017 | 8 days | ~10,000m | 22,065km | |
| U3S-10 | Jim N2NXZ | 10-May-2017 | ~2 minutes | 0m | <100m | Crashed into nearby tree |
| U3S-9 | Jim N2NXZ | 23-Apr-2017 | 12.5hours | 370km | ||
| U3S-8 | Jim N2NXZ | 14-Apr-2017 | 11 days | 9,560m | Reported on 25-Apr-2017 over Arizona, almost circumnavigation! | |
| S-23 | Dave VE3KCL | 02-Apr-2017 | 1 day | 10,200m | 1,259km | |
| S-22 | Dave VE3KCL | 17-Mar-2017 | 8 hours | ~9,000m | 804km | |
| U3S-7 | Jim N2NXZ | 20-Feb-2017 | 1.5 days | 9,744m | 2,700km | |
| S-21 | Dave VE3KCL | 20-Feb-2017 | 1.5 days | 9,580m | >3,003km | |
| STELLA4 | Daniel DL6OW | 31-Dec-2016 | Unknown | Unknown | 120km | Latex stratosphere balloon |
| STELLA3 | Daniel DL6OW | 16-Nov-2016 | 4.5 hours | 9,020m | 96km | |
| S-20 | Dave VE3KCL | 06-Nov-2016 | 12 hours | 10,660m | 781km | |
| STELLA2 | Daniel DL6OW | 29-Oct-2016 | 4 hours | 6,080m | 194km | |
| U3S-4 | Jim N2NXZ | 19-Oct-2016 | 7 days | Unknown | ||
| S-19 | Dave VE3KCL | 10-Oct-2016 | Unknown | >10,000m | Unknown | Lost due to GPS fault |
| S-18 | Dave VE3KCL | 07-Oct-2016 | 27 days | 11,080m | 46,502km | Second VE3KCL circumnavigation! |
| Brick | Jim N2NXZ | 22-Sep-2016 | 3 days | 9,500m | N/A | Transatlantic flight by Jim N2NXZ |
| S-17 | Dave VE3KCL | 19-Sep-2016 | 6 days | 11,560m | 11,187km | |
| S-16 | Dave VE3KCL | 02-Aug-2016 | 1 day | 10,340m | 940km | |
| STELLA1 | Daniel DL6OW | 30-Jul-2016 | 7 hours | 8,700m | 181km | First DL6OW flight! |
| S-15 | Dave VE3KCL | 19-Jul-2016 | 9 days | ~9,500m | 11,615km | |
| S-14 | Dave VE3KCL | 11-Jul-2016 | 2 days | ~9,500m | 3,634km | |
| S-13 | Dave VE3KCL | 04-Jul-2016 | 6 days | ~10,000m | 12,732km | |
| S-12 | Dave VE3KCL | 21-Jun-2016 | 9 days | ~10,000m | 15,114km | |
| S-11 | Dave VE3KCL | 14-Jun-2016 | 24 days | >10,000m | 38,092km | First VE3KCL circumnavigation! |
| S-10 | Dave VE3KCL | 09-May-2016 | 10 days | ~10,000m | 9,372km | |
| S-9 | Dave VE3KCL | 10-Apr-2016 | 18 days | ~10,000m | 51,711km | Epic flight! Almost back to the start line. |
| S-8 | Dave VE3KCL | 30-Mar-2016 | 10 hours | 13,180m | 783km | Highest VE3KCL flight. Used homemade balloon |
| S-7 | Dave VE3KCL | 11-Mar-2016 | 1d 9hrs | ~7,500m | 4,975km | |
| S-6 | Dave VE3KCL | 24-Sep-2015 | 3 days | ~8,000m | 4,300km | |
| S-5 | Dave VE3KCL | 04-Sep-2015 | 5 hours | 11,040m | Latex balloon (not mylar floater) | |
| S-4 | Dave VE3KCL | 24-Jul-2015 | 6 days | ~8,300m | 10,288km | First transatlantic VE3KCL flight |
| S-3 | Dave VE3KCL | 28-Jul-2015 | 5 days | ~8,000m | 4,335km | 16mW received 23,500km away by ZL1RS |
| S-2 | Dave VE3KCL | 22-Jul-2015 | 2 hours | 4,120m | 91km | |
| S-1 | Dave VE3KCL | 03-Jun-2015 | 2.5 hours | 4,333m | 68km | First U3S flight! |