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Chapter: Efficient Aerospace Vehicle Technologies, new invention technology, Research project papers,

PRANDTL-D Sub-Scale Glider

PRANDTL-D Sub-Scale Glider
Efficient Aerospace Vehicle Technologies, Advancing technology and science through flight 2014, Research, Technology, and Engineering Accomplishments, National Aeronautics and Space Administration NASA, Neil A. Armstrong Flight Research Center. new invention technology, Research project papers;

PRANDTL-D Sub-Scale Glider


Armstrong researchers are experimenting with a new wing shape that could significantly increase aircraft efficiency. The team has built upon the research of the German engineer Ludwig Prandtl to design and validate a scale model of a non-elliptical wing that reduces drag and increases efficiency. The approach to handling adverse yaw


employs fine wing adjustments rather than an aircraft's vertical tail. The Preliminary Research Aerodynamic Design To Lower Drag (PRANDTL-D) wing addresses integrated bending moments and lift to achieve an


11 percent drag reduction. In a propeller application, efficiency could increase by 13 percent.


Work to date: In 2013, the team developed, demonstrated, and validated a scale model of an improved PRANDTL-D wing. Initial results from a 4-month, small-scale flight experiment unequivocally established proverse yaw. Additionally, preliminary results of the parameter estimation show the correct sign and comparable magnitude to the analysis.



Looking ahead: Next steps are to build and test a propeller with the PRANDTL-D configuration.




 Highly efficient: Increases total aircraft efficiency by as much as 62 percent, including efficiency increases in the areas of wing (12.5 percent), drag reduction (25 percent), and use in propulsion systems (13 percent)

 Quieter: Decreases noise

 Faster: Allows aircraft to fly faster





 Energy delivery systems


Efficient Aerospace Vehicle Technologies


Increasing efficiency in aerospace systems is a key goal across the spectrum of NASA operations.


Armstrong researchers are constantly striving to build efficiency into all phases of flight projects, through development, fabrication, and operations processes.


From a new wing design that could exponentially increase total aircraft efficiency to a novel test stand for single-engine electric aircraft, our researchers are finding unique solutions that increase efficiency.


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