Candidate Chinese Naval Architecture Firms
for the 44-ft Container-Shippable Trimaran Seastead
This page lists Chinese design organizations that plausibly match our project: a novel, small-waterplane, foil-legged floating structure that must be engineered for volume production and shipped worldwide in a single 45-ft High Cube container.
Shortlist at a Glance
| Organization | City | Type | Best-fit role on this project | Est. duration* | Est. cost* (US$) |
|---|---|---|---|---|---|
| SDARI (Shanghai Merchant Ship Design & Research Institute) | Shanghai | State design institute (CSSC) | Turnkey lead designer: basic → detail design, class liaison | 8–14 months | $200k–$450k |
| MARIC (Marine Design & Research Institute of China, "708 Institute") | Shanghai | State design institute (CSSC) | Lead designer — strongest semi-submersible / floating-structure track record | 9–15 months | $180k–$400k |
| CSSRC (China Ship Scientific Research Center, "702 Institute") | Wuxi | National hydrodynamics laboratory (CSSC) | Subcontractor: CFD, towing-tank & seakeeping model tests of the foil legs | 3–6 months per test campaign | $40k–$120k per campaign |
| Bestway Marine (Shanghai Bestway Marine Engineering Design) | Shanghai | Private, publicly listed design house | Flexible lead designer; production drawings; most approachable for a small foreign client | 6–12 months | $120k–$300k |
| CIMC Raffles (Yantai CIMC Raffles Offshore) | Yantai | Offshore EPC with in-house naval architecture | Design-for-volume + first-article build of a floating platform | 9–15 months to production package | $150k–$400k engineering (often partly credited if you build with them) |
| SJTU — Shanghai Jiao Tong University, State Key Laboratory of Ocean Engineering | Shanghai | University laboratory | De-risking the novel parts: foil-leg seakeeping CFD + ocean-basin model tests | 4–8 months | $25k–$100k |
| HEU — Harbin Engineering University, College of Shipbuilding Engineering | Harbin | University laboratory | Alternative academic partner (seakeeping, motion control) — see compliance warning | 4–8 months | $20k–$70k |
*Planning estimates only, not quotes. Assumes a well-written English-language RFP, blended Chinese engineering rates, and fixed-price milestone contracts. Excludes prototype construction, tooling, and shipping.
Firm Profiles
1. SDARI — Shanghai Merchant Ship Design & Research Institute
About. One of China's highest-output merchant-ship design houses, with hundreds of designs delivered (bulk carriers, tankers, container ships, and specialized tonnage including heavy-lift/semi-submersible transport ships). Deep bench in hull-form optimization, intact/damage stability, structural design, and class plan approval; routinely coordinates model-test programs.
Fit for this project. If the seastead is headed for volume production with class-approved drawings, SDARI can carry it from refined concept through production-ready detail design and containerization drawings, and their weight-estimation discipline is valuable given your 62,000-lb container limit.
Watch-outs. A large state institute: a small, unconventional, one-off foreign project may be declined, quoted high to cover overhead, or given low scheduling priority. CSSC affiliation raises compliance questions for U.S. clients (see notes below).
- Est. time
- 8–14 months, basic through detail design (subcontracted tests in parallel)
- Est. cost
- US$200k–$450k
2. MARIC — Marine Design & Research Institute of China (708 Institute)
About. CSSC's broad-spectrum design institute covering commercial ships, offshore platforms, semi-submersibles, and special vessels, with in-house seakeeping groups used to unconventional floating bodies.
Fit for this project. Arguably the closest domain match: our concept is really a "mini semi-submersible platform with foil-shaped columns that can also make way," and MARIC's offshore side thinks exactly that way — useful if the seastead ends up classed as a floating installation rather than a vessel. Also relevant for the tension-leg mooring (3-ft pull-down on helical screws).
Watch-outs. Same state-institute caveats as SDARI: slower procurement, international projects routed through a business-development arm, possible reluctance toward very small jobs.
- Est. time
- 9–15 months, basic design
- Est. cost
- US$180k–$400k
3. CSSRC — China Ship Scientific Research Center (702 Institute), Wuxi
About. China's premier ship-hydrodynamics R&D center: deep towing tanks, a seakeeping/ocean-engineering basin, cavitation facilities, and large CFD groups. Primarily a test and research subcontractor, not a turnkey design house.
Fit for this project. The ideal place to validate the design's riskiest physics: resistance of the truncated NACA 0035 foil legs, heave/pitch/roll RAOs, the damping contribution of the bolt-on heave plates, slamming loads under the walkway grating, and installed-thrust effects of the six rim-drive thrusters.
Watch-outs. Book basin slots early; expect to fund physical model manufacture separately; CSSC affiliation (compliance check).
- Est. time
- 3–6 months per campaign including model build and reporting
- Est. cost
- US$40k–$120k per campaign (budget two campaigns: resistance/powering + seakeeping)
4. Bestway Marine — Shanghai Bestway Marine Engineering Design Co., Ltd.
About. A private, exchange-listed ship-design and marine-engineering company covering commercial vessels, offshore units, and engineering services, with a reputation for taking flexible scopes and working with foreign clients.
Fit for this project. Probably the easiest counterparty on this list: commercially motivated, accustomed to unusual small projects, able to convert university test results into a class-submittable basic design and CNC-level production drawings, and to support assembly at the destination shipyard. A natural "integrator" for a multi-party program.
Watch-outs. Confirm their appetite for genuinely novel hydrodynamics (they may want a university or CSSRC study as an input rather than doing blue-sky research themselves); negotiate explicit IP ownership of the design package.
- Est. time
- 6–12 months for basic + detail design
- Est. cost
- US$120k–$300k
5. CIMC Raffles — Yantai CIMC Raffles Offshore
About. Major offshore engineering-procurement-construction group (semi-submersible rigs, floating aquaculture structures, floating wind foundations) with in-house naval architecture and strong production engineering.
Fit for this project. "Design something we can manufacture repeatedly and efficiently" is their home turf. They could quote an integrated program: engineering + first-article build + volume production line, which suits the "manufactured in volume" goal. Their floating-platform heritage fits the seastead better than a shipyard that only thinks in hulls.
Watch-outs. They will likely prefer design bundled with a build contract; confirm aluminum capability for the legs/walls or accept a steel/aluminum split with a partner yard.
- Est. time
- 9–15 months to a production-ready package
- Est. cost
- US$150k–$400k engineering (frequently discounted or credited against a build order)
6. Shanghai Jiao Tong University (SJTU) — State Key Laboratory of Ocean Engineering
About. China's most prominent naval-architecture and ocean-engineering school, with its own ocean basin and towing facilities and a long record of contract R&D for industry.
Fit for this project. Best value for de-risking the concept before paying for full design: CFD and basin tests of the three-foil small-waterplane configuration, heave-plate damping, and motion behavior with two coupled seasteads under way (the community-walkway scenario). To our knowledge SJTU is not on U.S. restricted-party lists, which simplifies cooperation — verify current status.
Watch-outs. Deliverables are studies and test reports, not production drawings — pair with Bestway or a yard. Timelines flex around the academic calendar.
- Est. time
- 4–8 months
- Est. cost
- US$25k–$80k for a defined CFD/seakeeping study; basin model tests roughly $40k–$100k
7. Harbin Engineering University (HEU) — College of Shipbuilding Engineering
About. An elite shipbuilding university with strong seakeeping and high-performance-craft laboratories and very competitive pricing.
Fit for this project. A capable, lower-cost alternative academic partner, particularly for seakeeping and the differential-thrust motion-control problem.
Watch-outs — important. As of our last information, HEU is on the U.S. Commerce Department Entity List; U.S. persons/companies may need export licenses to transfer technology to it or fund certain work. U.S.-based teams should get legal advice before engaging; simpler for non-U.S. clients. Verify current status.
- Est. time
- 4–8 months
- Est. cost
- US$20k–$70k
Honorable Mentions (not design leads)
- China Classification Society (CCS) — not a designer, but engage early. Decide with them whether the unit is classed as a vessel or a floating installation; this decision shapes the whole structural and stability scope. Budget roughly $20k–$60k and 2–4 months for plan approval if you pursue class.
- Guangdong aluminum-craft yards (e.g., AFAI Southern Shipyard in Panyu, which has historically built aluminum fast ferries; Jianglong Shipbuilding in Zhuhai) — yards like these often have in-house detail-design teams and are realistic builders of the foil legs and wall sections. A common cost-saving pattern: the naval architect stops at basic design; the yard's team does production detail design.
Overall Budget & Schedule Estimate
Path A — Lean validation path (recommended for this concept)
- SJTU (or CSSRC) validates hydrodynamics/seakeeping: CFD + one model-test campaign
- Bestway Marine (or similar private house) does basic + detail design, containerization drawings
- Destination/Chinese yard does production detail under license of the design package
Est. total: US$150k–$350k • Est. elapsed: 12–18 months
Path B — Full-service institute path
- SDARI or MARIC as turnkey lead designer
- Two CSSRC test campaigns (resistance/powering + seakeeping)
- CCS class plan approval included
Est. total: US$350k–$800k • Est. elapsed: 18–24+ months
Typical phase plan
| Phase | Content | Duration |
|---|---|---|
| 0. RFP & contracting | Bilingual RFP, NDAs, IP terms, milestone payment schedule (30/30/30/10 is typical) | 1–2 months |
| 1. Concept refinement | Hydrostatics (verify the "1 ft draft ≈ 1/7 displacement" waterplane behavior), weight budget vs. 62,000-lb container limit, GA, CFD screening | 2–4 months |
| 2. Model tests | Resistance/powering; seakeeping with heave plates; two-seastead coupled motions (optional) | 2–4 months (overlaps Phase 3) |
| 3. Basic design | Structure (global triangle-frame strength, leg-to-frame fatigue), stability booklet with compartment damage cases, systems & electrical (triple-redundant power architecture), mooring design | 4–6 months |
| 4. Class approval (optional) | CCS plan review and comment resolution | 2–4 months (overlaps) |
| 5. Detail / production design | CNC cutting files, bolted field-assembly joints, container packing plan & assembly manual, outfitting | 4–8 months |
Excluded from all figures above: prototype construction (very roughly, a one-off aluminum/steel prototype at a Chinese yard might run US$0.5M–$1.5M — get yard quotes), tooling for volume production, batteries/thrusters/solar procurement, and shipping.
Scope Items to Put in the RFP (cost drivers)
- Refined hydrostatics of the truncated NACA 0035 legs at 50% draft; confirm waterplane stiffness and the draft-change/displacement relationship
- Seakeeping: RAOs in Caribbean sea states; bolt-on heave-plate added mass/damping; slamming loads under the walkway grating; underway comfort at design speed
- Structure: global strength of the 44-ft triangle wall/frame, the 22-ft internal beam triangle, leg-to-frame connection fatigue, walkway bracket and dinghy-support design, container-lifting/Securing loads for the shipped legs
- Stability: intact and damage cases using the legs' multiple watertight compartments; windage of the 7-ft walls plus solar roof; mooring pull-down cases (3-ft tension-leg depression, never-slack criterion)
- Mooring: helical-screw sizing for Caribbean soils, paired-screw/motor unit layout near each corner
- Propulsion & power: six fixed rim-drive thrusters 2 ft above the keel; differential-thrust turning and turn-in-place; ~25% of displacement in LiFePO4 batteries low in the legs; per-leg charge controller/inverter redundancy; cable conduit on the trailing edge (no through-hulls)
- Containerization: packing plan into one 45-ft High Cube (leg pairing geometry, upright wall sections), plus destination shipyard assembly procedure with bolted joints
- Regulatory strategy: class (CCS?) vs. unclassed floating structure; implications for harbor entry and the two-seastead coupled walkway configuration
Practical & Compliance Notes
- Corporate structure: China's two big state shipbuilding groups (CSSC and CSIC) merged in 2019; SDARI, MARIC, and CSSRC now all sit under the combined CSSC. Institute numbers (702, 708) are still commonly used.
- Compliance screening (U.S. clients especially): CSSC appears on the U.S. DoD "1260H" list, and Harbin Engineering University is on the Commerce Department Entity List (status as of our last information — verify current lists). This doesn't necessarily prohibit contracts, but it can affect payments, technology transfer, and export-control exposure. The cleanest path for a U.S. client is likely the private firm + SJTU combination. Consult counsel before signing.
- Taxes & payment: Chinese service contracts with foreign entities typically attract VAT and withholding — factor roughly 10% — plus cross-border payment lead times. Milestone payments (30/30/30/10) are standard; model manufacture is usually billed separately.
- IP & language: Use bilingual contracts under a negotiated governing law; state explicitly that the full design package (drawings, CNC files, analysis models) is work-for-hire owned by you, including the right to have any yard build from it.
- Owner's representative: Consider retaining an independent naval architect (Hong Kong or elsewhere) to write the RFP and review deliverables — typically 5–10% of design cost, and it materially de-risks a novel design done overseas.
- Prototype before volume: Whatever firm you choose, budget for one prototype and a sea-trial iteration loop before committing to production tooling; this design space is new and the first article will teach you things no simulation will.