Build Sequence

Before committing $2-3M to a full-scale 40,000 km cable and a Starship launch, validate every critical assumption at small scale. Build short cable segments, test splicing under load, prove coatings survive atomic oxygen, and deploy a spool from altitude. This step is the engineering equivalent of staging before production — nothing goes to orbit until it works on the ground.

Produce a continuous loop of Zylon (PBO fiber) cable, roughly 40,000 km in circumference — enough to circle the Earth at 100 km altitude. The cable is wound onto a deployment spool sized for a single launch vehicle payload fairing. Zylon is an existing industrial material manufactured by Toyobo (Japan), used in body armor, motorsport tethers, and aerospace applications.

A single launch vehicle (e.g. Starship) delivers the spooled cable to a 100 km altitude circular orbit. The payload is the cable spool plus a deployment mechanism. At current projected pricing, this is the single largest cost in the entire bootstrap sequence.

The cable is unspooled from the deployment mechanism into a continuous loop encircling the Earth. Ground-based electromagnetic stations then accelerate the cable from orbital velocity (7,844 m/s) to 102% overspeed (7,999 m/s). The 2% excess velocity generates net outward centrifugal force — this is what will hold the stator platforms up.

A 15 kg stator platform is magnetically levitated onto the spinning rotor. The platform uses a Halbach array for passive maglev coupling — the rotor's excess centrifugal force supports the platform's weight against gravity. The platform is the anchor point for everything that follows: tethers, payloads, power, and comms.

From the levitated platform, three redundant 0.5mm Zylon threads are lowered 80 km to a stratospheric balloon station at 20 km. This is Stage 2 of the three-stage transport system. Above 20 km, there's negligible wind — the tether hangs nearly vertically. Power flows up via a high-voltage DC conductor woven into the tether. Comms flow via a fiber-optic strand.

A cluster of stratospheric balloons is deployed to 20 km, forming the relay station between the surface tether (Stage 1) and the ring tether (Stage 2). A Dyneema (UHMWPE) rope is suspended from the balloon station down to a ground station at an equatorial site. This lower tether must survive the jet stream at 10-12 km — the highest-risk segment.

The first payload climbs the full three-stage tether system: ground to balloon station (Stage 1), balloon to ring platform (Stage 2), received at the ring (Stage 3). The payload is more Zylon cable. Every kilogram of cable added to the rotor increases the ring's load-bearing capacity, enabling heavier future payloads. The self-reinforcing loop has begun.

As ring mass grows, additional stator platforms are levitated at intervals around the circumference. Each new platform gets its own tether pair (upper and lower), its own balloon station, and its own ground connection. Throughput scales linearly with station count.

Each doubling of ring mass accelerates the next doubling. More mass means more platforms, more throughput, faster reinforcement. The ring enters an exponential growth phase. First doubling (~120 days), second (~60 days), third (~30 days).

The single cable evolves into a six-cable ladder topology with cross-links every 500-1000m. This is the transition from 'minimum viable' to 'operational infrastructure.' The ladder topology survives 1-2 cable severings with load redistribution and enables self-repair via tether payload delivery.