A minimal viable product seastead — scaled to fit in a single 40‑foot shipping container. Designed for stability, low drag, solar autonomy, and comfortable living for two.
The MVP seastead is a scaled‑down version of the full triangle‑frame seastead concept. It retains the key innovations — a triangular truss living area elevated above the water, three NACA‑0030 foil‑shaped legs for low‑drag buoyancy, RIM drive thrusters for maneuverability, and active stabilizers for a supersoft ride — while shrinking the overall dimensions so that every structural component fits inside one 40‑foot shipping container (interior ~39.5′ L × 7.7′ W × 7.9′ H).
The largest pieces (the three foil legs) are built in two bolt‑together sections each, keeping individual part lengths under ~9.5 feet. The triangular truss frame assembles from beams no longer than ~19 feet (shipped diagonally in the container). Assembly can be done at a marina or calm‑water site in the Caribbean with basic tools and a small crane or davit.
Top‑down conceptual view — triangular frame with three foil legs, rear dinghy, side decks, and stabilizers
All components are designed to nest and stack within the 39.5′ × 7.7′ × 7.9′ interior of a standard 40‑foot shipping container. The strategy uses a modular breakdown so that no single piece exceeds ~9.5 feet in length (except a few truss beams up to ~19 ft that ship diagonally).
| Component Group | Pieces | Max Piece Length | Packing Notes |
|---|---|---|---|
| Foil Leg Sections | 6× (3 legs × 2 halves) | 8.5 ft | Stacked flat; NACA profile nests alternating tip‑to‑tail |
| Truss Frame Beams | ~18 beams | 19 ft | Diagonally corner‑to‑corner in container (~39′ diagonal) |
| Cross‑Bracing & Connectors | ~40 pieces | 6 ft | Bundled in crates; bolt‑together nodes |
| Solar Panels | 6–8 panels | 6.5 ft | Flat‑packed with protective interleaving |
| RIM Thrusters (4×) | 4 units | 1.5 ft Ø | Nested in foam‑lined crates |
| Stabilizer Wings (2×) | 4 wing halves | ~4 ft each | Stacked; bolt together at center |
| Dinghy (RIB) | 1× 10 ft RIB | 10 ft | Deflated or nested under truss beams |
| Interior Fit‑out (galley, berth, etc.) | Flat‑pack modules | 6 ft | IKEA‑style flat‑pack cabinets & panels |
| Battery Bank & Inverter | 2–3 pallets | 4 ft | LiFePO₄ rack units, inverter/charger |
The enclosed triangle truss provides approximately ~280 sq ft of interior floor space. Large wraparound windows (tempered glass) offer panoramic views. The interior is laid out efficiently for two people with all the essentials.
Each of the three legs has a NACA 0030 symmetric foil cross‑section (30% thickness‑to‑chord ratio). The blunt leading edge faces forward for minimal drag when the seastead moves. At 6 ft chord and ~1.8 ft max thickness, each leg displaces approximately ~62 cu ft when 50% submerged (8.5 ft draft), contributing ~4,000 lbs of buoyancy per leg in seawater.
The bottom of each leg is sloped at 5° (front ~10.5″ higher than the back), providing mild hydrodynamic lift at cruising speeds. The top half of the front face (above water) includes a built‑in ladder rungs for boarding from the water.
| Leg Parameter | Value | Notes |
|---|---|---|
| Total Length | 17 ft | Two 8.5′ bolt‑together sections |
| Chord | 6 ft | NACA 0030 profile |
| Max Thickness | 1.8 ft (21.6″) | At ~30% chord from leading edge |
| Draft (submerged) | ~8.5 ft | 50% of leg length |
| Bottom Slope | 5° | Nose ~10.5″ higher than tail |
| Material | Fiberglass / epoxy over foam core | Lightweight, corrosion‑proof |
| Attachment | Bolted flange at top | Connects to triangle frame underside near each apex |
Four RIM drive thrusters (1.2 ft diameter each) are mounted in pairs on the two front‑side legs — one on each side of the port leg and one on each side of the starboard leg, approximately 3 feet up from the bottom of each leg. The flat faces of the RIM drives orient fore‑aft to minimize drag. This arrangement provides differential thrust for steering and station‑keeping without a rudder.
Two stabilizer "mini‑airplanes" attach near the aft edge of the port and starboard legs. Each stabilizer has:
The stabilizers actively counteract wave‑induced motion, giving the MVP seastead a ride quality superior to most yachts — even in choppy conditions.
A compact 10 ft RIB dinghy (scaled from the original 14 ft for the MVP) is stored sideways against the center of the backside of the living area. When the seastead moves forward, the dinghy is shielded from wind by the triangular structure. It uses a small electric outboard (e.g., Torqeedo or similar) for short trips.
Two small deck platforms (4 ft wide each) extend beyond the rear cross‑beam on the port and starboard sides, providing easy water access and a place to board the dinghy.
Two support arms and two ropes lower the dinghy into the water for use.
With conservative estimates, the system supports all onboard loads — fridge, watermaker, lights, electronics, and thruster maneuvering — with a healthy surplus on sunny days. The battery bank provides 2–3 days of autonomy without sun.
The three narrow foil legs create a very small waterplane area (the cross‑sectional area where the legs intersect the water surface). This means passing waves displace very little additional buoyancy, resulting in dramatically reduced heave, pitch, and roll compared to a conventional monohull or catamaran.
Combined with the active stabilizers, the MVP seastead achieves a "super‑soft ride" — more akin to a semi‑submersible platform than a yacht. At anchor or underway, the living area remains remarkably level and calm.
| Dimension | MVP Value | Original (Full‑Scale) |
|---|---|---|
| Triangle side length | 36 ft | 70 ft |
| Back width | 18 ft | 35 ft |
| Interior height | 5.5 ft | 7 ft |
| Leg length | 17 ft | 19 ft |
| Leg chord | 6 ft | 10 ft |
| Leg max thickness | 1.8 ft | 3 ft |
| Draft | ~8.5 ft | ~9.5 ft |
| Displacement | ~12,000 lbs | ~45,000+ lbs |
| Thrusters | 4× 1.2′ Ø | 6× 1.5′ Ø |
| Stabilizer wingspan | 7.5 ft | 12 ft |
| Solar | 1,200 W | 3,000+ W |
| Dinghy | 10 ft RIB | 14 ft RIB |
| Berths | 2 | 4–6 |
This MVP design de‑risks the core innovations — foil‑leg buoyancy, small waterplane stability, container‑shippable modular assembly, and solar autonomy — at a fraction of the cost of the full‑scale seastead. Once validated with real‑world testing in the Caribbean, the design scales naturally:
The modular, container‑shippable approach means every MVP lesson feeds directly into the next size up — no wasted engineering.