High Frontier 4 All

Wet mass includes all fuel and is used for thrust and movement calculations; dry mass is the spacecraft without fuel or jettisonable tanks. Track fuel and Wet Mass chits per the mass rules and adjust wet mass when fuel is spent or tanks are jettisoned (Rulebook pp. 15–16; p.54).

You may mix fuel grades in a tank but each thruster requires a compatible fuel grade to fire; mixing doesn’t make an incompatible thruster usable (see Fuel grades, mixing rules and thruster compatibility) (Rulebook p.17).

Follow the permitted Stacks rules when assembling components, create LEO and Rocket stacks using the step-by-step stack creation rules and checks, and obey load/mass and tankage constraints shown in the examples; Outposts have their own creation steps (Rulebook pp.11–13).

Aerobrake or factory-assist landings/liftoffs use the special aerobrake/factory rules instead of or in addition to burn fuel as specified, and hazards (belt rolls, CME, etc.) still apply per the aerobrake and factory-assist procedures and examples (Rulebook pp.24–25).

Prospecting is a five-step operation (survey, prospect roll, place cubes, etc.) with raygun/buggy/missile variants; Industrialize and placing exploitation track cubes follow the prospect/industrialize operation rules and examples (Rulebook pp.31–32).

Sunspot events list specific effects—Glitch causes hand/hazard issues and Solar Flare can damage stacks or cause CME-like effects—apply the event outcomes and remedies as described in the sunspot cycle table and examples (Rulebook p.37; example CME on p.14).