Assess students' ability to apply orbital mechanics and delta‑v budgeting to design interplanetary transfer trajectories that incorporate gravity assists and plane changes. Tasks include using patched‑conic approximations (Hohmann/bi‑elliptic), computing transfer and plane‑change delta‑v (including Oberth effects), estimating V∞ and bending‑angle tradeoffs for gravity assists, assembling a full delta‑v budget (departure, TCMs, DSMs, capture), and justifying time‑of‑flight versus fuel tradeoffs with numerical calculations and qualitative reasoning.