photostream – Day two
The sail making process is one of the biggest challenges within the sailing industry. The design and use of custom material systems is dependent on the specific boundary conditions of the ship such as speed and stability.
A cruising sail comparable to a Super Yacht for example is combining Mylar© and structural yarn in a specific geometrical configuration to cover the performance requirements.
We want to investigate virtually and physically the properties of textile materials to control the bending stiffness, stretch ability or torsion of composite materials. By designing different patterns of the structural yarn we can achieve lightweight and flexible systems that can enhance architectural spaces.
photostream – Day one
CFD in Grasshopper
CFD analysis in Grasshopper from Daniel Davis on Vimeo.
Vortex of Air
A Sheet of red fabric continuously flies in and out of a vortex of air. By Daniel Wurtzel
(More videos: http://www.youtube.com/user/danielwurtzel)
Johan Bettum -The Material Geometry of Fibre-Reinforced Polymer Matrix Composites
This is a very interesting presentation about fibre-reinforced composites presented at the Digital Crafting Workshop 5 at CITA,Copenhagen.
Have a look and be inspired.
Yachting technology
Sailboat-technology has a very large collection of articles on the science of yachting:
- Aerodynamics and Hydrodynamics
- Construction and Materials
- Design
- Handicap Systems and Rules
- Performance
- Routing
- Sailing Basics
- Stability
- Tank Testing
http://www.sailboat-technology.com/links/online_articles.php
Material Behaviour
An initial experiment tested by Sascha and Khoo to study the material behaviour of sail in-between digital and physical platform. The physical model is embedded with wind force sensor which sending data to the Grasshopper model to simulate the material bahaviour. We wish this approach will generates some interesting outcomes before the workshop begin.
Helpful Links of design technologies and materials
Free sail design and plotting software package
Dynamic sail
This is a rough, initial simulation of a sail using Kangaroo for Grasshopper/Rhino.
We illustrate the concept of draft and depth of a sail, through measuring the furthest point from bottom of the sail to the foot.
The ratio of this distance to the length of the foot is called the depth.
The corresponding point on the foot gives us the draft, in this case as the ratio from the front of the sail to the total length of the foot.
There are many ways to improve this model. The sail here is modeled with a too elastic material, the shape is not that of real sail, the connections to the mast and the foot are too simple to provide all characteristics of a sail in wind.
And of course, most importantly, it is not a complete fluid-dynamic simulation! But it may be enough to start thinking about: what features of a sail will we expect to see from a simulation, and what can we discard? What physical quantities (pressure, forces etc.) do we want to be able to read off dynamic geometry?