Day 3 (Saturday 2 August 2014)

The first presentation of the third day of congress was given by Nick Grassen, a student of the Pennsylvania State University talking about applying game theory models to analyze sailplane racing. For that scope he used the igc-Files of the 2011 Standard class US-Nationals to gather data to feed his models. He divided the pilots due to their used height band, the average speed they flew between thermals and if they flew in a gaggle or not into conservative or aggressive flying pilots. After applying his models he could show that most likely on a one day competition an aggressive flying pilot will win while as more days are taken into account it will get more likely that conservative flying pilots succeed.

The second presentation with the title “Improvement of sailplane crashworthiness through keel beams with silicon cores” was given by Uwe Schuster of the Technical University of Dresden. He introduced the idea of implementing silicon Material in the crash structure of a glider. For that purpose he gave an introduction in a-Gel materials. He told about the material testing used for determination of material properties as input for a FEM model of the D-B 11 fuselage. The D-B 11 is the current double-seater-sailplane project of the Akaflieg Dresden. The FEM crash-simulations carried out afterwards are showing a distinct improvement of crash behavior if 2 keel beams containing the a-Gel are implemented.

The presentation after the coffee brake was given by Zelldra Lombard from Jonker Sailplanes South Africa. Her talk about “A composite manufacturing process for producing Glass A finishing components” first introduced us into how to define and measure standards of surface finishing defined by e.G roughness and waviness. She afterwards gave a good overview how the complete production process from CNC cutting the plugs, building the molds and finally producing the parts in mold has to be enhanced to satisfy a high quality standard.

In the next talk Linar Yusupov from the Russian Federation introduced his ideas of an open platform collision warning system. He introduced how it should be possible to build such a system with components easy and cheap to buy. He gave an overview of specification of hardware and software and informed about the software components already developed. Finally he showed the results of testing a first prototype.

The last task of the day had more of a demonstration. Benjamin Pipenberg also a student from the Pennsylvania State University introduced us into the “Design and Fabrication of Micro Radio –Control Ornithopters, Helicopters and Fixed-Wing aircraft” He introduced us into the troubles of aerodynamics of very low Reynolds numbers of just 3000 for his smallest model having just a span of 75mm. After telling how to build such small models we got nice live demonstration of 2 of his models.