PLANETARY SLINGSHOT
The Grand Tour Program
MISSION 01
TARGET: MERCURY
Flyby sequence
Telemetry
T+000.0
VEL
NEXT
RANGE
RCS fuel
Aim +0° off prograde
Burn 12.0 Δv
Time warp
How to fly
The goal is the gravity assist: each mission slingshots off the Moon (and, further out, an assist planet — Venus inward, Jupiter or Saturn outward) to reach its target, just like real missions. ◈ PLAN LAUNCH scans for the optimum alignment; when found, ▲ GUIDED LAUNCH appears with a countdown to the best window — click to commit, and the ship departs at T−0 on a pure ballistic slingshot (route shown in amber).

Flying manually? Thread the dashed cyan prediction line through the pulsing ring and hit LAUNCH. In flight, WASD / arrows fire RCS thrusters (limited fuel — the amber bar). ▶ DEMO flies missions 1–4 hands-off, showing the settings it picks.