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CourseNaval, Offshore & Sports Nautical Applications open

Course in Stability of Multihulls and Trimarans

Online 300-hour course in stability of multihulls and trimarans. 6 modules covering ISO 12217-2 Evaluation of stability and buoyancy of sailing boats of length greater than or equal to 6 m, HSC Code 2000 International Code of Safety for High-Speed Craft and Maxsurf Stability. Assigned tutor and open enrolment.

Duration300 h
ModeOnline
Start datesSet by the faculty
AwardSEIUM Institute certificate
Enrol now View syllabus Ask an advisor
Virtual lab · try it before you enrol

Take the controls.

Run a real engineering trade-off from this field. Move the sliders, watch the model react in real time and beat the challenge.

SIM · LIVE ●
Learning outcomes

What you will be able to do

01

Understand the specific hydrostatics of multihulls.

02

Analyse the mechanisms of transverse and longitudinal capsize.

03

Apply ISO 12217-2 and the HSC Code.

04

Calculate stability in damage conditions for narrow hulls.

05

Assess dynamic stability in waves.

06

Propose safety measures against capsize.

07

Prepare a complete stability study of a multihull.

Profile

Who it's for

  • Multihull designer who wants to specialise in Stability of Multihulls and Trimarans.
  • Naval stability engineer who wants to specialise in Stability of Multihulls and Trimarans.
  • Recreational craft inspector who wants to specialise in Stability of Multihulls and Trimarans.
  • Classification society engineer who wants to specialise in Stability of Multihulls and Trimarans.
  • Marine consultant who wants to specialise in Stability of Multihulls and Trimarans.
  • Professional catamaran skipper who wants to specialise in Stability of Multihulls and Trimarans.
  • Graduates in engineering or science looking to enter the recreational boating sector.
Standards & tools

What you'll work with

  • ISO 12217-2 Evaluation of stability and buoyancy of sailing boats of length greater than or equal to 6 m
  • HSC Code 2000 International Code of Safety for High-Speed Craft
  • Directive 2013/53/EU on recreational craft
  • ISO 12217-1 Non-sailing boats
  • ISO 12216 Windows, portlights, hatches and doors: strength and watertightness requirements
  • World Sailing Offshore Special Regulations
  • IS Code 2008 International Code on Intact Stability
Syllabus

6 modules · 300 h

  1. 1.1Flotation inertia with separated hulls
  2. 1.2Very high transverse metacentric height
  3. 1.3Characteristic GZ curve of multihulls
  4. 1.4Angle of maximum righting arm and capsize
  5. 1.5Influence of hull separation
  6. 1.6Trimarans: lateral floats and central hull
  7. 1.7Reserve buoyancy of floats
  8. 1.8Longitudinal stability and bow burying
  9. 1.9Comparison with monohull stability
  10. 1.10Practical case: GZ curve of a sailing catamaran
  1. 2.1Transverse capsize mechanisms
  2. 2.2Longitudinal capsize (pitchpoling)
  3. 2.3Heeling moment of wind on the rig
  4. 2.4Stability after capsize: inverted equilibrium
  5. 2.5Gusts and dynamic response
  6. 2.6Effect of breaking waves
  7. 2.7Speed and capsize risk
  8. 2.8Preventive measures: sheet release
  9. 2.9Documented accidents and lessons
  10. 2.10Practice: calculation of capsize wind speed
  1. 3.1ISO 12217-2: design categories
  2. 3.2Specific requirements for sailing multihulls
  3. 3.3Capsize risk warnings for the user
  4. 3.4Buoyancy in inverted position
  5. 3.5Escape hatches in multihulls
  6. 3.6HSC Code for passenger catamarans
  7. 3.7Intact stability criteria of the HSC Code
  8. 3.8Stability in damage conditions for catamarans
  9. 3.9Classification rules for trimarans
  10. 3.10Workshop: verification of a catamaran to ISO 12217-2
  1. 4.1Compartmentalisation of narrow hulls
  2. 4.2Asymmetric flooding of a hull
  3. 4.3Heel and trim after damage
  4. 4.4Breaches in trimaran floats
  5. 4.5Damage survivability calculation
  6. 4.6Materials and buoyancy foams
  7. 4.7Watertight bulkheads in composites
  8. 4.8Evacuation on fast passenger vessels
  9. 4.9Cases of damaged fast ferries
  10. 4.10Laboratory: flooding of a catamaran hull
  1. 5.1Rolling in beam seas
  2. 5.2Coupled motions in quartering seas
  3. 5.3Stability of high-speed trimarans
  4. 5.4Capsize tests with models
  5. 5.5Six-degrees-of-freedom dynamic simulation
  6. 5.6Heavy-weather sailing and heaving-to techniques
  7. 5.7Sea anchors and drogues
  8. 5.8Operability criteria in open sea
  9. 5.9Comparison between catamaran and trimaran
  10. 5.10Practical case: simulation of a trimaran in quartering seas
  1. 6.1Definition of the multihull and its category
  2. 6.2Hydrostatic model of hulls and floats
  3. 6.3Calculation of the complete GZ curve
  4. 6.4Wind capsize risk assessment
  5. 6.5Verification to ISO 12217-2 or the HSC Code
  6. 6.6Damage stability analysis
  7. 6.7Safety recommendations for the user
  8. 6.8Simplified stability manual
  9. 6.9Report and presentation
  10. 6.10Final review with the tutor
Methodology, software & labs

How you'll learn

100% online training on the SEIUM campus, with downloadable material, recorded classes and an assigned technical tutor. No fixed timetables: students progress at their own pace within the intake, which makes it possible to combine with work.

Each module combines theory, guided reading of the original standard and applied exercises. The working software is Maxsurf Stability, GHS (General HydroStatics), Rhinoceros 3D with Orca3D, OrcaFlex, in free, academic or evaluation versions. Tests are studied using real procedures for calculating the GZ curve of multiple hulls, assessing capsize wind speed and simulating asymmetric flooding. Assessment is continuous by module plus the final integrative project.

Accreditable laboratories(EN ISO/IEC 17025) with rotor rig, EMC/Lightning pre-compliance, HIL/SIL, vibration/acoustics.
Evidence-oriented Master's Thesis:safety case, test plan, compliance dossier and operational limits.
Industry mentoring:lecturers with experience in training, , eVTOL/UAM and flight test.
Flexible format(hybrid/online), international cohorts and support from SEIUM Career Services.
Ethics and safety:safety-by-design approach, with OT cybersecurity, DIH and compliance as its pillars.
Capstone project

Build it end to end

Your final project follows the real engineering workflow, step by step, reviewed by your tutor.

Definition of the multihull and its category

Understand the specific hydrostatics of multihulls.

Hydrostatic model of hulls and floats

Analyse the mechanisms of transverse and longitudinal capsize.

Calculation of the complete GZ curve

Apply ISO 12217-2 and the HSC Code.

Wind capsize risk assessment

Calculate stability in damage conditions for narrow hulls.

Verification to ISO 12217-2 or the HSC Code

Assess dynamic stability in waves.

Career opportunities

Where this takes you

Multihull designerNaval stability engineerRecreational craft inspectorClassification society engineerMarine consultantProfessional catamaran skipper
Admissions & scholarships

Requirements

  • No prior degree is required.
  • Internet connection and a computer capable of running the programme's software.
  • Sufficient command of Spanish to follow technical standards documentation.

Ready to start?

Send your application today. Our admissions team replies within 72 hours with your study plan and funding options.

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FAQ

Frequently asked questions

The programme comprises 300 hours in total, spread over 3 to 5 months. That is an average of 10 to 15 hours per week, compatible with a full-time job.

You work with Maxsurf Stability, GHS (General HydroStatics), Rhinoceros 3D with Orca3D, OrcaFlex. Free, academic or evaluation versions are used, and the tutor indicates the free alternative where one exists.

An SEIUM own diploma upon passing the continuous assessment and the integrative project. It is in-house training, not an official qualification from the Ministry.

Yes. Modules passed in a course or Postgraduate Diploma in the same area are credited towards the advanced programme. Check the credit transfer policy when you enrol.

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