JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 44

Process Adjusting the rudder blades Strain gauges are bonded to the carbon-epoxy structural main frame embedded in the rudder blades, and wired in a full bridge configuration to the boat. The signal is recorded by an HBM Spider 8 data acquisition system. Then, the sensors measure the bending moment due to hydrodynamical lift on each side. Sample data are shown in the figure below. (Fig.2) Shear deformation in the core of a sandwich hull Fig.4: Sensors in the bow Fig.2: Time response for rudder blade lift The recordings show a lot of scatter, due to the difficulty in controlling the boat in the swell. However, with this type of recording, it is possible to reach the average lift in a short time. The lift was smoothed in this way for various adjustments to the rudder parallelism (X-coordinate in the figure below). On the left side, there is too much lift of the starboard rudder blade, producing an opposite lift on the port-side rudder blade. In the middle, the adjustment ensures that the starboard rudder blade will carry the total lift, while the one on the port side is set at zero. An extreme point appears on the right side of the graph where the wrong rudder blade undergoes the lift. The appropriate adjustment was chosen, helping to reduce drag. The local deformations to the sailboat hull’s sandwich core were measured using two sensors placed in the bow, where the hull is subject to slamming. Each sensor consists of pieces of foam, cut and reassembled using vacuum bonding to form a cylinder where one or several planes are sensitive to deformation. Bearing in mind the expected type of stressing on a sandwich core, the bonding directions and type of wiring used for the gauges were chosen in order to measure the shear strain while eliminating the effects of other stresses and temperature. These sensors were inserted into the shear web at the place of measurement, and a test according to the NF T 54-605 standard was conducted to assess their sensitivity. During the sea trials, the boat travelled at a speed of 8 knots and was subjected to the impact of waves one to two metres high – relatively mild conditions for the type of boat. More information The boat: Length: 18.28 m Displacement: 9.5 T Height from deck: 26 m Sail area upwind: 290 sq m The skipper: Roland Jourdain 1st: Route du Rhum 2006 St Malo-Pte à Pitre 1st: Calais Round Britain Race 2005 2nd: Transat Jacques Vabre 2005 Sail area downwind: 600 sq m 2nd: SNSM 2006 speed record Draught: 4.50 m Materials: carbon-Nomex sandwich Speed: 25-30 kts Fig.3: Lift vs Alignment - Boat on starboard 3rd: Vendée Globe 2000 World Champion: IMOCA 2000-2001-2002 World Champion: FICO 2002 No35 September 2007 / JEC Composites Magazine

JEC COMPOSITES MAGAZINE - Issue #35 - September 2007

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #35 - September 2007

Edito
CONTENTS
NEWS WORLDWIDE
- Companies
- Agenda of events
- 2008 JEC Singapore
BUSINESS
- Market survey
- Niche markets
- Trends
- Human capital
FEATURE - MARINE
- Market
- Raw Materials
- Process
- Application
USERS’ PLATFORM
- Composites in the world
- Successful partners
- Applications
KNOW-HOW
- Warp knitting technology
- Testing
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 1
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 2
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - Edito
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 4
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 5
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - CONTENTS
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 7
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Companies
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 9
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Agenda of events
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 11
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - 2008 JEC Singapore
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 13
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 14
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 15
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Market survey
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 17
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 18
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 19
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 20
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 21
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 22
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 23
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Niche markets
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 25
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Trends
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 27
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 28
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 29
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Human capital
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 31
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Market
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 33
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Raw Materials
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 35
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 36
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 37
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 38
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 39
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Process
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 41
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 42
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 43
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 44
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 45
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 46
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 47
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Application
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 49
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Composites in the world
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Successful partners
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 52
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 53
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 54
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 55
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 56
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 57
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Warp knitting technology
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 59
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 60
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 61
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 62
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - - Testing
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 64
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 65
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 66
JEC COMPOSITES MAGAZINE - Issue #35 - September 2007 - 67
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