Factorio 2.1.21 Space Platform Drag: Design for Mass and Thrust

• Factorio: Space Age with a space platform on the experimental 2.1 branch, version 2.1.21 or later.

Step-by-Step Instructions

1. Review an existing platform's tile use and thrust under the mass-based drag rule.
2. Keep the layout compact where that does not interfere with the platform's other needs; each additional tile contributes to drag regardless of position.
3. For a design focused on speed, consider more thrusters, higher quality thrusters, or both while accounting for any mass added.

What Changed for Platform Layouts

Previously, extending a platform by one tile at its widest point could reduce top speed almost as much as filling that entire column. Under the new formula, each added tile has the same effect on drag regardless of where you place it. You can widen a section when the layout needs it, but extra tiles still add up.

A wider platform can make room for more thrusters. Additional thrust may improve speed if it justifies the added mass; width alone is no guarantee. In a modeled comparison described by CodeGreen in the official Factorio post, speed gains from increasing width eventually diminished and then reversed.

How to Adapt a Platform

Review an existing design by its tile use and thrust rather than judging it by its widest point. The formula change applies to platforms built before 2.1.21, too.

• Keep the tiles your layout needs and remove unnecessary area where practical. Moving an added tile from the side to another position does not reduce its drag contribution.
• If speed is the goal, consider more thrusters, higher quality thrusters, or both while accounting for any mass added.
• Keep a narrow design if it suits the rest of the platform. The new drag rule does not require a wide ship.

If an Existing Platform Is Slower

Check which branch you are running. Factorio’s release list showed Space Age 2.1.23 on the experimental branch and 2.0.77 on stable. If you moved to experimental 2.1.21 or later, an existing platform’s speed can change because the new formula applies to it. Reassess tile use and available thrust before rebuilding its outline solely to make it narrower.

Troubleshooting

• If an existing platform's speed changed after moving to 2.1.21 or later, reassess thrust relative to mass; the formula applies to existing platforms.
• If widening a platform does not improve speed, do not assume width itself helps. Consider whether the additional thrusters justify the added mass.

Alternatives

• Keep a narrow platform when its layout and defenses call for one; narrow designs remain viable under the new formula.

For the other 2.1.21 changes, including asteroid damage, see our Factorio update report.

Find more Factorio coverage on the game hub.