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PolskiHow to Build in Space: Angular Momentum & Station Tumbling (2D)
2D orbital-assembly lab: a truss and solar arrays bolt onto a station core while real conservation of angular momentum (L = I·ω) governs the tumble — moment of inertia grows as mass moves outward, and RCS thrusters damp the spin back down.
This 2D companion strips the 3D orbital-assembly scene down to the physics that actually drives it: every truss segment and solar panel is tracked as an individual mass at a fixed position relative to the station core, and each frame the scene recomputes the true center of mass and moment of inertia about it rather than faking a wobble. When reaction-control thrusters are off, angular momentum is conserved exactly — as the moment of inertia grows while the truss extends outward, angular velocity falls, the same "figure-skater effect" that slows a spinning skater's rotation when they extend their arms. A live readout panel shows the moment of inertia, angular momentum and angular velocity as plain numbers, so the physics is something you can read off a value rather than infer from watching a mesh spin.
2D orbital-assembly lab with a real per-part mass model, exact conservation of angular momentum (L = I·ω) when RCS is off, and a reaction-control damping law (τ ∝ −ω) that visibly fires harder the faster the station tumbles.
2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install