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http://silentaircraft.org/

These are the public entries for this link:

• The 'Silent' Aircraft Initiative
  The 'Silent' Aircraft Initiative has a bold aim - to develop a conceptual design for an aircraft whose noise would be almost imperceptible outside the perimeter of a daytime urban airport. This requires radically different aircraft and engine designs.
  By HarryManback in Tech with aeronautics aerospace
• The 'Silent' Aircraft Initiative
  By johnrod in Zigtag Imported Bookmarks with aircraft efficiency fuel

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