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New Year, New Poseidon

4th June 2026

Poseidon Version 6

Version 6 is the latest evolution of the Poseidon launch vehicle family and represents the most significant upgrade package introduced by Space Systems since the program's inception. Developed using data gathered from multiple flights across both the Poseidon 9 and Poseidon Heavy fleets, Version 6 focuses on improving performance, reliability, recovery operations, and future mission capability.

The centerpiece of the Version 6 upgrade is the introduction of hot-staging technology, allowing the upper stage to ignite before full separation from the booster. By reducing gravity losses during ascent, this new staging architecture improves payload performance and increases overall mission efficiency.

Version 6 also incorporates revised booster throttling profiles, upgraded flight software, improved guidance algorithms, and enhancements to vehicle recovery systems. These upgrades provide greater operational flexibility while maintaining the rapid reusability philosophy at the core of the Poseidon program.

The upgrade package will be introduced across both operational members of the Poseidon fleet:

Poseidon 9 V6

The latest version of Space Systems' medium-lift launch vehicle. Poseidon 9 V6 is optimized for constellation deployment, crew transportation, station logistics, and commercial satellite missions. The vehicle is capable of delivering up to 25 tonnes to Low Kerbin Orbit (LKO) in a reusable configuration and up to 35 tonnes expendable.

Poseidon Heavy V6

The most powerful launch vehicle currently operated by Space Systems. Built around three Poseidon-derived booster cores and powered by 27 Kerlin engines, Poseidon Heavy V6 is designed for high-energy missions, large payload deployments, and deep-space exploration. The vehicle can deliver up to 50 tonnes to LKO with booster recovery and up to 85 tonnes in a fully expendable configuration.

Version 6 will make its operational debut during Poseidon Heavy Flight 9, the KASA Lunar Mission, before being introduced to the Poseidon 9 fleet on the Eagle Eye 7-3 mission. Together, these flights will mark the beginning of a new era for the Poseidon launch system and lay the technological foundation for future Space Systems vehicles, including the Spaceship program.

ATS33 Sat 1 will Launch on Posideon 9

AllThingsSpace33 Space Systems CEO will launch their Satellite using Space Systems Posidoen 9 on the 6th of April 2025.

Update on Mishap For Posiedon Heavy Flight 4

Space Systems have made a lot of progress in finding the cause for the loss of the 2 side cores on PH Flight 4. we have discovered that a misconfigurment of a setting on the boosters (FMRS not being armed) led to them not initiating the boostback burn. we are pending us finishing our mishap report for us to plan a launch date for Flight 5.

Update on Posideon Heavys 4th Flight, to LEO

Space Systems are targeting the 13th at 6:30pm ACDT for the launch of Posideon Heavy Flight 4.

Update on the Spaceship Veryheavy program

Space Systems are preparing for the First Test flight of the Spaceship vehicle at 7:30am ACDT on the 13th of Feb

Leviathan V2 Has Docked To The KSS

On the 2nd of Febuary Leviathan sucessfully docked to the KSS and has begun its 2 week crew flight test it currently is targeting the 22nd for undocking and is targeting landing at the KSC on the 23rd of Febuary.

News Regarding Leviathan Demo 4

On the 28th January 2025 Space Systems attempted to launch 4 Kerbals to the KSS aboard Leviathan which is our crew vehicle. Upon launch there was a software bug that made the launchpad disconnect from Poseidon 9 before the engines ignite. Space Systems have Implemented corrective actions to solve the problem and are preparing to attempt a launch tomorrow at 7:30am ACDT.

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