https://peertube.dngr.us/videos/watch/08671115-b583-4ab5-8ab7-a6041664b676 The video shows the unique propfan design. The propfan is designed to achieve the speeds and altitudes of jets while only using half the normal amount of fuel. Released June 1987. Mirrored from YouTube: https://youtu.be/0QqQ1j1vBgw Original channel: NASA STI Program Wed, 15 Jul 2026 12:57:36 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://peertube.dngr.us https://peertube.dngr.us/lazy-static/avatars/ec5edb1e-3795-4978-be4f-c67e98fbc992.png https://peertube.dngr.us/videos/watch/08671115-b583-4ab5-8ab7-a6041664b676 All rights reserved, unless otherwise specified in the terms specified at https://peertube.dngr.us/about and potential licenses granted by each content's rightholder.