Stingray Lab · Engineering services
Naval architecture, CFD, certification and build management. We specialise in catamarans and trimarans with foils — and we calculate any hull.
Foil-assisted catamarans and trimarans: foil, hull and structure designed together, in one bureau.
CFD, stability, structure and certification for monohulls, catamarans and trimarans.
Every CFD study is cross-checked; where it matters we verify it in the towing tank in Varna and on sea trials.
The CE technical file below 24 m; the full class and flag service from 24 m.
We build in the EU with our own team and manage the build for the owner — one contract, one schedule, one team.
Working drawings for one-off designs and interiors adapted to the real hull, ready for the yard and the joinery shop.
Thousands of hull variants in a night; every drawing revision checked against the rules within a working day.
What only we offer
Most engineering bureaus sell drawings and calculations. We take a yacht from the first question to the delivery — and check every step digitally.
| Typical bureau | Stingray Lab | |
|---|---|---|
| Foils on multihulls | Hull designed first; a foil, if any, added by a specialist later | Foil, hull and structure designed together and compared in CFD with and without the foil |
| Performance | CFD or a tank test, usually one of the two | CFD cross-checked, verified in the tank in Varna and on sea trials, all on one chart |
| Hull variants | A handful, chosen by experience | Thousands screened in a night; the best run in full CFD |
| Rule compliance | Checked when the file goes to the notified body or class | Every drawing revision checked within a working day |
| Contract and specification | Read by the lawyer | Every line cross-checked against the drawings and the weight book before you sign |
| Unique designs | Concept handed to the yard to interpret | Complete working drawings, designer's intent kept |
| Interior | Drawn by the designer, fitted by the yard | Adapted to the real structure, weights and rules; joinery production drawings |
| Build | Ends with the drawings | We build with our own team and manage the build for the owner |
| After delivery | A binder of manuals | A digital assistant that knows the yacht and answers the crew in any language |
| Quotation | After a meeting, in weeks | In writing, the same working day |
Where to start
Every service is described the same way, so you can compare and order without a meeting. Each entry service is small, fast and credited against the larger step that follows.
| Service | The question | Next step |
|---|---|---|
| I1 Foil check | Is a foil worth it on your multihull? | Credited against I8 |
| A1-S CFD snapshot | A real CFD answer for any hull in days. | Credited against A1 |
| A0 Desk check | Do a seller's speed and range figures add up? | — |
| B4-R Design review | Is the design you hold sound? | Credited against B4 |
| D-0 CE readiness | How far is this boat from CE marking? | Credited against the CE package |
| G8 Survey | What condition is she really in? | — |
How a project runs
A new 18 m foil-assisted catamaran, from the owner’s brief to the CE technical file and the build. The foil, the model test and the structure run in parallel, and the weight is watched from the first week to launch.
I · 9 services
Our specialisation. A foil changes how a multihull runs: trim, wetted surface, spray on the bridgedeck, loads on the hull. We design the foil, the hull and the structure together, in one bureau, and test the result in CFD against the same hull without a foil before a single plate is cut.
Is a foil worth it on this hull?
CFD of your catamaran or trimaran with and without a foil at three speeds. A clear go or no-go with the gain or loss in resistance at each speed.
What foil, where, and at what angle?
Section, span, chord and angle of attack; position against the LCG; lift and drag curves; cavitation margin at top speed. Tunnel foil between the demihulls, or main-hull and ama foils on a trimaran.
How does the whole boat run with the foil?
A sweep of span, angle and position with full hull interaction: running trim, spray on the bridgedeck, ventilation at the tunnel roof.
Will it hold, and for how long?
Design loads, spar, local reinforcement of an aluminium hull, fatigue, galvanic isolation between foil and hull, and the route to CE or class.
Is the boat stable at speed?
Running trim over the speed range, porpoising check, pitch damping in waves.
Ready for the workshop?
Production drawings and cutting files in duplex 2205, titanium or aluminium; tolerances and inspection points.
Can an existing multihull get a foil?
Survey of the boat, I2 to I6 for the existing hull, installation procedure and sea trials with and without the foil.
A new design with a foil from day one.
I2, I3, I4 and I5 as one package, run in parallel with the hull design.
Where do the amas go?
Ama position, stagger, clearance and volume optimised in CFD, including monohull-to-trimaran conversions.
L · 7 services
Our engineering runs on a digital platform that reads, checks and calculates around the clock. It does work a design office would never attempt by hand: thousands of hull variants in a night, every drawing checked against the rules the day it is issued, every document of your project read and compared line by line. Engineers decide; the platform makes sure nothing is missed.
Of a thousand possible hulls, which is best for you?
A parametric search over length, beam, hull spacing, deadrise and foil position. Every variant is screened for resistance, stability, weight and the CE or class limits; the best are run in full CFD.
Does this revision still comply?
Each revision of structure, stability and systems is checked against ISO 12215, ISO 12217, the harmonised CE standards or the class rules within a working day, with the changed items listed.
Do the contract, the specification and the drawings say the same thing?
Every line of the build contract and specification is compared with the drawings, the equipment lists and the weight book. Contradictions, gaps and items priced twice are listed before you sign.
Is the yard where it says it is?
Photo and video reports from the yard are checked daily against the schedule, the drawings and the quality plan. Deviations go to the owner's representative the same day.
A crew member who has read every manual.
An assistant that knows your yacht's documents — systems, manuals, maintenance plan, certificates — and answers the owner and crew in their own language, on the phone or in a chat, at any hour.
One file, every market.
The CE technical file, owner's manual and operating instructions issued in the languages of the markets you sell in, consistent term by term.
Which listings tell the truth?
Claimed speed, power and range of a list of boats for sale checked against physics in one pass — before a buyer flies to see one.
A · 9 services
CFD for any hull — monohull, catamaran or trimaran. Every study is cross-checked by an independent method, and where it matters we verify it with a model test at the Bulgarian ship hydrodynamics centre in Varna, correlated with our CFD, at a fraction of the cost of Western European tanks.
Do the claimed speed and range add up?
An empirical check of a seller's or designer's figures for speed, power and range.
A fast, real CFD answer.
Bare-hull CFD at five speeds: resistance, trim and sinkage. Credited in full against a full study.
How will the hull perform, and why?
Three to five speeds: resistance, trim, sinkage, wave pattern and, for multihulls, interaction between the hulls; independent cross-check.
Which of two hulls is better?
One more hull form in the same set-up, so the comparison is like for like.
What do the pods, tunnels and foils cost in drag?
Resistance and flow around pods, propeller tunnels, foils and interceptors.
How will she behave at sea?
Motions and accelerations in the agreed sea states; bridgedeck slamming for multihulls.
A tank test anywhere, managed for you.
Test brief, model, programme, attendance, analysis and corrections to the lines.
Verified numbers before steel.
A model built to our lines and tested for resistance (and seakeeping on request) at the Bulgarian ship hydrodynamics centre, correlated with our CFD.
Close the loop.
CFD, model test and sea-trial results brought together into one corrected prediction.
B · 7 services
The cheapest moment to get a yacht right is before anyone draws it in detail. We turn an owner's brief into numbers, a layout and a specification the yard can price.
What exactly are we building?
Concept, general arrangement, specification with options and packages, input data for the designer and engineers.
What is the competition doing?
Review of the vessel type and its competitors with figures.
Which studio, on what terms?
Brief and scope for exterior and interior designers, short-list, licence and royalty terms.
Is this design sound?
A written review of lines, GA, weights and structure concept.
Can it be built, and for what?
Producibility, structure weight and cost frame of a client design.
Make a styling concept real.
Lines, displacement, weights, preliminary stability and powering, structural concept and class route behind a styling concept.
Can this vessel become an explorer yacht?
Haul-out check, concept GA, weight and stability frame, cost frame and class route.
C · 11 services
From approved lines to files the yard's CNC and welding shop can use — with the weight watched at every decision.
Everything the yard needs to cut and weld.
3D structural model, working drawings, nesting, CNC files, welding plans, bill of materials and jigs.
Every pipe, cable and machine in its place.
Propulsion, generators, batteries, piping, HVAC, cables, switchboards, navigation and deck gear — diesel, diesel-electric or hybrid.
Will she float where she was drawn?
A weight book kept through the whole design; every decision checked for weight, draught and clearance.
How much power?
Empirical resistance and powering.
Will it pass ISO 12217?
Early stability check against ISO 12217.
How far on a tank?
Range at cruising speeds.
The best hull within your limits.
Parametric hull variants, CFD of the best, recommendation.
The right equipment at the right price.
Specifications, enquiries and comparison of offers.
One team, one model, one schedule.
One 3D environment, schedule and acceptance of partners' work.
From feasibility to class approval.
Structure, lengthening, stability and class submission for a conversion.
No drawings? We measure the boat.
Laser scan by our partner, Rhino model and as-built drawings.
K · 4 services
A designer's concept is a picture. A yard needs thousands of decisions it can cut and weld. We take one-off and unusual designs — new hull forms, sculpted superstructures, unusual materials — and turn them into a complete, buildable set of working drawings without losing the designer's intent.
From a render to a fair hull.
Hull and superstructure surfaces rebuilt from the designer's model or sketches, faired and checked for displacement, trim and stability.
Everything the yard builds from.
Structure, superstructure, deck, outfitting and systems drawings for a one-off design, coordinated in one 3D model.
Built as drawn — or better.
Every place where engineering changes the look is shown to the designer with options before it is fixed.
Glass, curves, carbon, large openings.
Engineering of large glazing, curved panels, cantilevers, hybrid aluminium-composite details and their certification route.
J · 4 services
An interior drawn on a deck plan rarely fits the real hull. We adapt interiors to the structure, weights and rules of the boat — and produce the production drawings a joinery shop can work from.
Will the layout fit the real boat?
The designer's layout fitted to frames, tanks, headroom, escape routes and the CE or class requirements; options where it does not fit.
Comfort without the extra tonnes.
Panel types, thicknesses and materials chosen for weight, sound and fire rules; the interior weight entered into the weight book.
Ready for the joinery shop.
Furniture, linings, ceilings and floors as production drawings and cutting files, with fixing details to the structure.
A new interior in an old hull.
Survey or 3D scan, new layout within the existing structure and systems, refit drawings.
D · 7 services
Every craft placed on the EU market needs CE marking under Directive 2013/53/EU. We prepare the complete technical file — from scantlings to the Declaration of Conformity — and coordinate the notified body where the route requires one.
How far is this boat from CE?
Gap list against the essential requirements.
Are the scantlings right?
Scantling calculations to ISO 12215-5, and -7 for multihulls.
Is she stable in her category?
Calculations, test attendance and stability information.
Do the systems meet the standards?
Fuel, electrical, fire protection, bilge, steering, windows and hatches, seacocks, ventilation, anchoring, man-overboard, field of vision.
Inboard engines?
Noise assessment by test or calculation.
What the owner receives.
Owner's manual to ISO 10240, hull identification number, builder's plate.
The file that puts the boat on the market.
The conformity route by design category and length, the technical file and notified-body coordination.
E · 7 services
From 24 m the yacht is built under class and registered under a flag. We run the whole process: strategy, plan approval, surveys and the statutory documents.
Which society, notation and flag?
Society, notation, flag, private or commercial use and the applicable codes.
Drawings approved, surveys passed.
Submissions, comments closed, survey attendance through design and build.
The stability booklet class and flag sign.
Intact and damage stability booklet with inclining test.
Load line and freeboard documents.
Support for tonnage measurement.
Pollution prevention, fire control and safety plans.
As-built documentation and operating manuals for class and flag.
F · 6 services
Registration under construction or on delivery, and the compliance a yacht needs for charter. Any length.
Which flag, and how?
Flag and regime advice, registration on delivery.
Title secured from the first stage.
Registration of the vessel while it is being built.
Ready for paying guests.
Fire safety, life-saving appliances, minimum crew; REG Yacht Code from 24 m.
More yacht below the 24 m line.
Rule length and tonnage designed in from the start.
When the rule does not fit the idea.
Direct calculation, FEM or tests to prove equivalence to the notified body or class.
What does she really weigh?
Lightship survey and weight audit.
M · 4 services
We do not only design. We build in the EU with our own team and manage the build for the owner: one contract, one schedule, one budget, one team responsible from the first plate to delivery.
Which yard, on what terms?
Tender to yards, comparison of offers, build contract with stage payments tied to physical milestones and warranty terms.
One counterparty for the whole build.
We contract the build and deliver the hull or the complete yacht, built by our team with our engineering and our supervision.
Schedule, budget and quality under one hand.
Planning, suppliers, cost control, quality plan, inspections and the change log; biweekly reports to the owner.
From sea trials to the owner's first voyage.
Trials, defect closure, certificates, crew familiarisation and handover documentation.
G · 13 services
We represent the owner at any yard, check the work on site, run the trials — and stay with the yacht after delivery.
Your eyes at the yard.
New-build supervision against the contract and specification, with biweekly reports.
Purchasing of equipment for the build.
Project management of a refit or conversion.
Does she do what was promised?
Trial programme, attendance, measurements and defect list.
Technical review of a build contract.
Before you buy.
Condition survey anywhere, abroad with a local partner surveyor.
Independent visual and ultrasonic weld inspection.
Installation, commissioning and design supervision on site.
A monthly report on progress, money and risk.
Hull no. 2 onwards.
Engineering update for each further hull of a series.
Model book and sales material for shows and brokers.
Documentation, warranty, spares and service-yard support after delivery.
Design-chain budget and stage payment schedule for a project.
Certification by hull length
What a new yacht needs before it can be sold or registered, and what we deliver for it.
| Below 24 m — CE marking | 24 m and above — class and flag | |
|---|---|---|
| Legal basis | Recreational Craft Directive 2013/53/EU, hull length 2.5–24 m | Class society rules and the flag state; Load Line and Tonnage conventions from 24 m load line length; REG Yacht Code Part A for commercial yachts up to 12 passengers |
| Route | Set by design category and length: modules A, A1, B+C/D/E/F, G or H. From 12 m in categories A–C a notified body takes part | Class plan approval and surveys during construction, flag registration, statutory certificates as applicable |
| Our service | D1 structure, D2 stability with tests, D3 systems, D4 noise (inboard craft), D5 owner's manual, HIN and plate, D6 technical file and Declaration of Conformity | E1 strategy, E2 plan approval and surveys, E3 stability booklet with inclining, E4 load line, E5 tonnage, E6 safety and pollution plans, E7 as-built documentation |
| Charter use | F3 commercial compliance package | F3 REG Yacht Code package |
Hull length is measured to ISO 8666. Load line length is a different measure: a yacht can exceed 24 m overall and still stay below 24 m load line length (F4).
How we work
Get in touch
A technical survey of the site and a legal review of the concession. We arrange both and open the data room under NDA.
Send the brief, or the design you already own. You get a producibility check and a quote per stage, on an open book.
Send the 3D model, class drawings and specification. You get a producibility report and a scope you set yourself.
Or simply write to sales@stingray-yachts.com. Your details go only to the Stingray team — see the privacy policy.
Correspondence runs through sales@stingray-yachts.com. Hours, material invoices and subcontract orders on a build are visible to you online as they happen.