CubeSat P-POD Detumble Simulator

P-POD deployment

Detumble strategy

Sim speed 1.0×

Status

|ω| now

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Orbits elapsed

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Sun pointing (solar panel)

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Power generation

Antenna–Earth lock

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How it works

A spring-loaded P-POD imparts a small, essentially random spin rate to every axis on ejection — the CubeSat leaves the rail tumbling with no control input at all.

A permanent bar magnet only aligns the body with the local field; without a separate dissipative mechanism (hysteresis rods, modeled here as light rotational damping) it would librate forever, so real passive stabilization needs many orbits to settle.

An active magnetorquer runs the classic B-dot law: it measures how fast the local field appears to rotate in the body frame (dB/dt) and drives a magnetic dipole moment m = −k·dB/dt against it, producing torque m×B that pumps rotational energy out directly — detumble in roughly one orbit.

Longer 2U/3U bodies have an asymmetric inertia tensor, so their tumble is visibly more chaotic (intermediate-axis flipping) than a 1U cube.
Power and antenna lock only recover once the body is both slow and pointed — a fast-tumbling satellite can't hold a fix even if it happens to cross the right heading.

TUMBLING

CubeSat body ω_x ω_y ω_z Sun vector B-field line

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Angular velocity magnitude vs. time

No detumble Passive magnet Active B-dot

All three strategies run in parallel from the same ejection tumble, so their decay curves are directly comparable — the highlighted mode drives the 3D view.