How do you get from a rocket that costs $55 million per seat to a personal spacecraft parked in your driveway? You climb a ladder. Each rung is a generation of propulsion technology, and each generation unlocks a new range of distance.
This report maps every rung.
| Gen | Name | Propulsion | Range | Status |
|---|---|---|---|---|
| CD-1 | Orbital Commuter | Chemical + Ion hybrid | Earth ↔ LEO | Engineering feasible |
| CD-2 | Lunar Express | Nuclear thermal + Ion | Earth ↔ Moon | Ground testing |
| CD-3 | Solar Cruiser | Nuclear fusion | Inner solar system | Conceptual |
| CD-4 | Interstellar Shuttle | Antimatter / Laser sail | ~50 light-years | Theoretical |
| CD-5 | Galactic Rover | Zero-point energy | Milky Way | Fundamental research |
| CD-Ω | Intergalactic Ark | Wormhole traversal | Other galaxies | Speculative |
What exists today: SpaceX Falcon 9 lifts 22,800 kg to LEO at ~$2,700/kg. Raptor 3 engines have doubled thrust while cutting cost by 75%. Ion thrusters deliver 3,000–5,000 seconds of specific impulse and are operating on NASA Psyche right now.
The gap for personal use: Current launch vehicles require ground crews of hundreds, months of preparation, and expendable or partially reusable hardware. A personal orbital vehicle needs: vertical takeoff and landing from a residential-scale pad (~15m diameter), autonomous flight control, reusable thermal protection, and compact life support for 1–2 people.
Acceleration profile: To reach LEO, you need ~9.4 km/s of delta-v. At 3g sustained acceleration, you reach orbital velocity in about 5 minutes. The real constraint is not g-force but sustained comfort and accessibility for non-athletes.
Energy: A single-person capsule reaching LEO requires roughly 8.8 × 10¹⁰ joules — equivalent to about 2.4 tons of liquid methane/LOX. The hybrid approach: chemical boost to clear the atmosphere, then ion cruise for orbital maneuvering.
Parking: The eVTOL industry has designed three tiers of ground infrastructure. A residential vertistation needs ~225 m² (15m × 15m) — roughly the footprint of a two-car garage.
Timeline estimate: 15–25 years. The propulsion exists. The miniaturization, autonomy, and cost reduction do not — yet.
What exists today: The DRACO program (DARPA + NASA, $499M) is building a flight-testable nuclear thermal rocket. NTP delivers ~900 seconds Isp — roughly double chemical propulsion.
Speed: Moon transit at sustained 0.5g acceleration: 8–12 hours total (vs. Apollo's 3 days). At lower, more comfortable 0.1g: 24–48 hours.
Key risk: Nuclear propulsion in residential proximity. Public acceptance may be harder than the engineering.
Timeline estimate: 30–50 years.
What exists today: Multiple fusion approaches. None have achieved net energy gain in a form applicable to propulsion.
Fusion propulsion promises 10,000–100,000 seconds Isp. Deuterium-tritium fusion releases 337 × 10¹² J/kg — roughly 10 million times the energy density of chemical propellant. A Mars round trip would require kilograms of fuel, not tons.
Timeline estimate: 50–80 years.
What exists today: Breakthrough Starshot is developing laser-propelled lightsails to reach Alpha Centauri at 20% lightspeed — but for gram-scale payloads only. CERN produces ~10 nanograms of antihydrogen per year.
Crossing interstellar distances with a crewed vehicle requires: specific impulse > 100,000 seconds, multi-year closed-loop life support, relativistic radiation shielding, and deceleration capability at destination.
Timeline estimate: 100–200 years.
What exists today: Dr. Harold White (formerly NASA Eagleworks, now CEO of Casimir Inc.) has demonstrated Casimir-effect energy extraction from nanostructured silicon chips — achieving 3.5V capacitive discharges. DARPA is funding this research. The Limitless Space Institute calculates 2.2 piconewtons per resonant tunneling diode.
From piconewtons to the meganewtons needed for a spacecraft is a factor of ~10¹⁸. This is not an engineering gap — it is a physics gap.
Warp drive research: A March 2025 paper demonstrated controlling spacetime curvature via electromagnetic fields, reducing energy requirements from 10⁶² J to 4.9 × 10⁶ J. A January 2026 paper showed how to match Alcubierre spacetime with flat Minkowski space.
Why this is CasDrive's core: The name is the mission. Casimir-effect propulsion is what separates a solar system vehicle from a galactic one.
Timeline estimate: 50–200+ years. Or never. Or tomorrow. This is fundamental physics — timelines are meaningless.
General relativity permits traversable wormholes in principle. Maintaining one requires exotic matter with negative energy density — which the Casimir effect actually produces.
Timeline estimate: Undefined. This is the horizon beyond the horizon.
| Barrier | Affects | Current Status |
|---|---|---|
| Launch cost reduction | CD-1 | Rapidly improving (SpaceX $2,700/kg) |
| Autonomous flight control | CD-1, CD-2 | eVTOL industry solving this |
| Reusable thermal protection | CD-1, CD-2 | Breakthrough concepts in 2025 |
| Compact nuclear reactors | CD-2 | DRACO program active |
| Compact fusion drives | CD-3 | Fusion energy still pre-commercial |
| Antimatter production scale-up | CD-4 | Needs 10¹⁵× improvement |
| Casimir force amplification | CD-5 | Piconewtons demonstrated, meganewtons needed |
| Wormhole creation & stabilization | CD-Ω | Pure theory |
The honest assessment: CD-1 is an engineering problem. CD-2 is a hard engineering problem. CD-3 is a physics-into-engineering problem. CD-4 onward is a physics problem. CasDrive's job is to work all of them simultaneously — because breakthroughs do not follow product roadmaps.
CasDrive — Personal Spacecraft. From here to the galaxy.