This volume contains the proceedings of the CEASlDragNet European Drag Reduction Conference held on 19-21 June 2000 in Potsdam, Germany. This conference, succeeding the First and Second European Forum on Laminar Flow Technology 1992 and 1996 respectively, was initiated by the European Drag Reduction Network (DragNet) and organised by DGLR (Deutsche Gesellschaft fUr Luft- und Raumfahrt - Lilienthal Oberth e. V. ) under the auspices ofCEAS (Confederation of European Aerospace Societies). The development of aerodynamic drag reduction technologies is driven by predictions of remarkable fuel savings, promising substantial improvements not only of aircraft efficiency but also of environmental compatibility. However, considerable efforts on an European scale are needed in order to develop, qualifY and demonstrate the means for their practical realisation. The primary aim of this conference was to provide a comprehensive survey of the current status of research, development and application in all disciplines of aerodynamic drag re­ duction including laminar flow technology, adaptive wing concepts, turbulence and se­ paration control, induced drag reduction and supersonic flow aspects. Besides aerodynamic topics the Call for Papers addressed also interdisciplinary aspects of design & system inte­ gration, structures, materials, manufacturing, operations and maintenance. The Programme Committee (PC), responsible for the scientific preparation of the conference, consisted of CEAS representatives and DragNet board members (see following page).

Session 1 The Challenge of Drag Reduction.- Perspectives for the Future of Aeronautics Research (invited).- The Importance of Aerodynamics in the Development of Commercially Successful Transport Aircraft (invited).- Drag Reduction: A Major Task for Research (invited).- Session 2 Achievements of Technology Demonstration.- Airbus A320 HLF Fin Flight Tests (invited).- Lessons Learned from Dassault¿s Falcon 900 HLF Demonstrator (invited).- Flight Testing of a HLF Wing with Suction, Ice-Protection and Anti-Contamination Systems.- Session 3 HLF Design & Suction System Integration.- New Aerodynamic Approach to Suction System Design.- Retrofit Studies based on Airbus A310 for HLFC Application on Aircrafts.- Light Transmission Control Technique and Correlation with Pressure Loss Characteristics of Perforated Panels for Hybrid Laminar Flow Applications.- DNS Study of Suction Through Arrays of Holes in a 3-D Boundary-Layer Flow.- Session 4 HLF Operational Aspects.- Saab 2000 In-Service Test of Porous Surfaces for HLFC.- Flight Operational Assessment of Hybrid Laminar Flow Control (HLFC) Aircraft.- Application of HLF Technology to Civil Nacelle (invited).- Session 5 Supersonic Flow Control Aspects.- European Research to Reduce Drag for Supersonic Transport Aircraft (invited).- Attachment Line Transition in Supersonic Flow.- Laminar Design for Supersonic Civil Transport.- Session 6.1 Transition Prediction.- Linear Stability Theory Applied to Natural and Hybrid Laminar Flow Experiments.- Modern Transition Prediction Techniques Based on Adjoint Methods.- Receptivity Processes and Transition Scenarios for Swept-Wing Flows with HFL Technology.- Influence of Acoustic Excitation on 3D Boundery Layer Instabilities.- Session 6.2 HLF Experimental Techniques.- Study of Wind Tunnel Simulation Methodology for HLFC Wings.- Transitional Flow Physics and Flow Control for Swept Wings: Experiments on Boundary-Layer Receptivity, Instability Excitation and HLF-Technology.- New Developments in Surface Flow Sensor Technology within the Framework of AEROMEMS.- Session 7 Realisation of Adaptive Wing Concepts.- Aspects of Shock Control and Adaptive Wing Technology (invited).- Drag Reduction on Gurney Flaps and Divergent Trailing Edges.- Next Steps Envisaged to Improve Wing Performance of Commercial Aircraft.- Session 8 Future Prospects.- Industrial Perspectives of Drag Reduction Technologies (invited).- Session 9 Turbulent Drag Reduction Methods.- Current Status and Prospects for Turbulent Flow Control (invited).- Yaw Angle Effects on Optimized Riblets.- Effects on the Resistance and on the Separation of V Shapes Passive Manipulators in a Turbulent Boundary Layer.- Session 10 Separation Control & Induced Drag Reduction.- Active Control of a Laminar Separation Bubble.- Induced Drag Reduction with the WINGGRID Device.- The Lifting System with Minimum Induced Drag.- Poster Session 1.- Assessment of the eN Method as a Transition Prediction Tool for Zero Pressure Gradient Flows with and without Boundery Layer Suction.- Active Control of Nonlinear Disturbances in 2-D Boundary Layers.- Control of the Coherent Vortical Structures of a Boundery Layer.- Novel Approaches to Combat Insect Contamination on HLFC Wings.- Evolutionary Search Algorithms for Boundary Layer Control.- Poster Session 2.- Experimental Investigations on Active and Dynamic Instability Control of Separated Turbulent Wing/Cylinder Flows.- Drag Reduction in Airfoils Using Control Devices in the Shock Wave-Boundary Layer Interaction Region.- Numerical Study of Separation Control by Movable Flaps.