Category Multihulls

Gunboat G4 sea trials

The all new Gunboat G4, designed by DNA has launched in St. Martin.  As usual the work list was extensive to get out on the water.  A few days after the sailing began, the final adjustments were made to the daggerboards and she set out to break new ground.  In 18-20 trade winds, the boat was up on foils and generating lots of smiles for the lucky crew.  Schickler Tagliapietra served in a support role in the development of the boat, as a new member of the DNA design team.   FEA structural simulation of boat and foils, stability calculations, VPP performance prediction and more.  Follow Gunboat or Holland Composites on Facebook for more details.

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Little America’s Cup

Davide Tagliapietra has joined the Challenge Italia campaign to wrest the Little America’s Cup from its defenders. This is the first time in over 30 years that Italy has mounted a challenge for this trophy, contested in the C class catamarans. Davide will be primarily responsible for structural simulation with the team and design work for what should be multiple platforms has already begun.

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Düsseldorf 2011

Schickler Tagliapietra is proud to join LinQ boats at B57 in Hall 16 for the Boot D

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Whites Dragons

We want to congratulate Fabrizio Dragoni and Edoardo Bianchi, collectively Whites Dragons (FB, or site) for the first successful flights of their catamaran! Schickler Tagliapietra was a tutor and supporter of this project through the process of design, particularly in regards structures. We look forward to more developments in the future.

Below is an excerpt from some recent press releases:

Concept:

The main goal was to create an easy boat, simple to transport, which can be sailed on foils instinctively, hardly different than a regular cat. Further, it had to be tremendously fast.

Design and Construction:

The two students designed and ultimately self-built this 2 person hydrofoil cat, almost exclusively of carbon fibre. Working with carbon A class hulls as a starting point, and borrowing the sail plan and mast directly from the Tornado class, they were well on their way. Simulation based design, tutored by Davide Tagliapietra, focussed on flight dynamics, VPP, foil hydrodynamics (CFD) and accurate dimensioning of newly built components using Finite Element (FEA).

Principal Data

  • LOA 7m
  • LWL 5.5m
  • Beam 4m (!)
  • All up weight 125kg
  • Mainsail area 16.35 m2
  • Genneker ca. 17-20 m2

By October the boat was sailing regularly and the results were convincing. Speeds over 20 knots with only the main have been achieved. With the genneker, the boat was able to fly in about 6 knots of wind.

Supporters:

www.ribacomposites.it
www.modelleriabrussolo.com
www.styacht.com
www.YCI.it
www.angeloglisoni.com
www.Rostan.com
North Sails Carasco
www.compositipuntamanara.com

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OpenFOAM developments

OpenFOAM is one of two CFD packages that are under consideration at ST for our internal CFD research and ultimately FSI solutions.

In the last months OpenFOAM has been implemented for both stationary and 2-6 DOF cases, generally involving free surface interaction. This implementation is part of ST’s ongoing commitment to be a simulation based practice employing the latest technologies for improved performance.

Here is one example showing a candidate catamaran hull tested at 15 knots. Data such as resistance and moments to maintain proper trim are compared between a number of candidates. With a simulation like this one, the effect of the transom immersion can be more accurately understood.

OpenFOAM simulation of catamaran hull

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34th America’s Cup Preparations

In mid September 2010, the protocol and draft design rule for the newest generation of America’s Cup racing yachts was revealed. To nobody’s surprise the match will be raced in large wing powered catamarans. Already during the course of the last match, ST began acquainting itself with the performance of wing rigs.

Preliminary CFD analysis of 2 element wing

ST has had tools for the generation and testing of curved, twisted and blended foil shapes for some time. New work for parametric and systematic generation of hull forms has been carried out. The control system of wings has been studied and the nascent class rule scoured for valid design directions. This will be the most demanding Cup cycle in recent memory, and ST is ready.

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Predator F20

ST has been working with CompoTech since 2007 on a variety of projects. The latest is the re-design of their F20 Predator catamaran. The current Predator is a very fast cat, finishing in the top 10 at Round Texel, behind only the M20. The lines of the boats will be revisited with an emphasis on reducing drag and improving longitudinal stability. The parametric hull generator matching CompoTech’s stringent manufacturing requirements has been completed. ST will be using OpenFOAM RANS solvers and slender body theory to score the candidates. Foils will also be optimized in similar fashion, employing both 2D and 3D simulation. Finally, the balance of the sailplan will be studied to enhance the boats overall performance.

Candidate Hull generated parametrically

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Ocean catamaran

Preliminary design for the Atlantic Challenge Dakar – Guadeloupe in 2011. The ocean catamaran is designed to average well over 10 knots on the course to easily break the current record.
For more information see the team’s website.

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