Project Daedalus (1973-1978)
A 5-year study by the British Interplanetary Society (BIS) for an unmanned interstellar flyby probe powered by fusion. The first detailed engineering study of a fusion-powered starship.
Key Facts
- Organization: British Interplanetary Society
- Target: Barnard’s Star (5.96 ly)
- Speed: 0.12c (36,000 km/s)
- Travel time: ~50 years
- Total mass: 54,000 tonnes (mostly fuel)
- Payload: 450 tonnes
- Fuel: Helium-3 / Deuterium pellets (He3 mined from Jupiter’s atmosphere)
- Propulsion: Inertial confinement fusion — 250 fusion micro-explosions per second
- Mission type: Flyby only (no deceleration)
Design Highlights
- Two-stage design (like a rocket): Stage 1 burns for 2 years, Stage 2 for 1.8 years
- Autonomous: 50-year flight with no human intervention; self-repairing via onboard robots
- Sub-probes: 18 smaller probes deployed before arrival to study the target system from multiple angles during flyby
- Designed with only near-term physics — no speculative technology, just scaled-up engineering
Legacy
- Proved fusion-powered interstellar travel is physically feasible
- Identified He3 mining from gas giants as a key enabler
- Successor study: Project Icarus (2009-present, Tau Zero Foundation + BIS) — updating Daedalus with modern technology