Is this flight software?

No. SIDUS models are educational reimplementations. Cross-check before any flight decision.

Multi-stage Δv budget

Staged rocket mass and Δv accounting.

SIDUS educational calculator. Category propulsion. Tags: delta-v, mission-design, propulsion. Pure SI. Not flight software.

Δv = Σ v_e,i ln(m₀,i / m_f,i)

Staged mass & Δv budget

Orbital Mechanics for Engineering Students (Howard D. Curtis): Textbook derivations for Hohmann, vis-viva, rocket equation, elements.
NASA Glenn Research Center: Beginner’s Guide to Aeronautics (NASA GRC): Ideal rocket equation, specific impulse, thrust equation, dynamic pressure education pages.
Rocket Propulsion Elements (Sutton & Biblarz): Standard propulsion text for rocket equation, Isp, and staged vehicles.

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.