The "SFS Space Shuttle" mods for Spaceflight Simulator (SFS)

External Tank (ET): Often built using large-diameter tanks. In advanced builds, these are "dry-mass optimized" to ensure the shuttle can carry at least 10–20% of its mass as payload.

For a truly functional shuttle experience, you often need parts not found in the base game: PicoSpace Industries' Utility Pack

This is one of the most anticipated technical mods, focusing on realistic part textures and variant concepts like the "BR Apollo" compatibility. Custom Part Packs (NDP & EUP):