Changes
- New: flyby targeting. The stock planner aims every transfer at the target body's center, so a well-timed Hohmann arrives as an impact and the flyby has to be set up afterwards as a separate correction. Tick Target flyby periapsis in the Transfer Planning window and the departure burn is aimed at a periapsis you choose instead, so Create fires the flyby directly.
- Periapsis is entered against a selectable reference: Surface (altitude above the mean radius), Center (radius straight from the body center), or Atmosphere (altitude above the atmosphere boundary). The Atmosphere option only appears for bodies that have one, and a request below the safe floor is refused.
- Flyby side picks which side of the body you pass, named in the target's own orbital frame: Inner (toward its parent), Outer (away from it), North or South. The aim offset has to stay perpendicular to the approach, so a side whose axis lies along the approach direction cannot be reached and is greyed out.
- Works for moon flybys and for interplanetary targets, either as a single burn or split across multi-pass passes. The section reports the approach speed, the impact parameter, the departure delta-V next to the impact-aimed one, and the periapsis the propagated trajectory actually reaches; while a flyby is armed the preview shows that retargeted trajectory in place of stock's center-aimed one.
- Flyby limitation: the plan is impulsive, the burn is not. On a near-escape departure the apoapsis moves by thousands of km per m/s of periapsis velocity, so the periapsis actually flown drifts from the requested one by roughly the finite-burn loss. Expect to trim it with a small correction burn, or split the departure across several passes to cut the loss.
- Fixed a crash in the Transfer Planning window: with a multi-pass execution running, changing the destination or pressing Calculate / Re-Calculate could throw while the window was drawing.
- Fixed stale plan-window state: the Create button was replaced by "Maneuver node created." for a vehicle that has no node after switching the Source dropdown or loading a save, the "Preview Orbit" overlay kept drawing after the window was closed with the keybind or the View menu, and the Source dropdown could select a non-vehicle when no vehicle was being controlled.
- Fixed Match Inclination planning against the wrong body after the selected target was destroyed, left the vehicle's sphere of influence, or a save was loaded. An empty target list now clears the selection instead of leaving live readouts and an enabled Create button.
- Fixed the hyperbolic-target departure-window alert, which was raised off the porkchop worker thread and claimed the target had passed periapsis when the condition it tests is that the ideal departure has passed. It is now raised when the destination is selected, with wording that matches.
Compatibility
Validated against KSA build version 2026.7.9.5018.
Installation
Extract into Documents\My Games\Kitten Space Agency\mods\AdvancedFlightComputer\.
Requires StarMap.