Solid Rocket Booster Recovery

Booster Recovery

PhaseReady

Deploy Setup

Drogue deploy altitude 4800 m

Main chute deploy altitude 1800 m

Simulation speed 1.0×

Live Readouts

Altitude

45,000 m

Descent rate

0 m/s

Dynamic pressure

0 Pa

Splashdown v

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How it works

Each Shuttle solid rocket booster (SRB) separated at about 45 km altitude and fell back under gravity and atmospheric drag alone. The net vertical acceleration is:

a = -g + (1/2 · ρ(h) · v² · Cd · A) / m
ρ(h) = ρ0 · e^(-h / H),  H ≈ 8500 m (atmospheric scale height)

Three drag configurations apply in sequence, each changing the effective Cd·A (drag coefficient × reference area):

Tumbling freefall — nose-cap still attached, small cross-section, Cd·A ≈ 11 m². Speed builds fast in the thin upper air.
Drogue chute — a 16.7 m conical ribbon chute deploys, pulls the booster tail-first, and slows it to roughly terminal descent, Cd·A ≈ 100 m².
Main chutes — three 41 m ringsail canopies pull free of the frustum, driving Cd·A up to ≈ 2,600 m² for a gentle splashdown.

Terminal velocity at any instant is v_t = √(2mg / (ρ·Cd·A)) — this is why dropping the deploy altitudes lower lets the booster build more speed before each chute bites, and why the real recovery sequence targets a splashdown speed near 23 m/s (75 ft/s) to keep the steel casings reusable. Recovery ships then winch the floating boosters aboard for reprocessing.

Booster casing Drogue / main chutes Ocean surface

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