https://peertube.dngr.us/videos/watch/b6857663-d0fb-4f4b-b8cb-45c9ab81ef36 Footage (in flight) of various test aircraft or 'X-planes', including: Douglas D558 (Phase 1) Northrop X4 Douglas D558 (Phase 2) Bell X5 Douglas X3 Date: 11/12/1974 Mirrored from Internet Archive: https://archive.org/details/NIX-LV-1998-00135 Wed, 15 Jul 2026 12:46:16 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/b6857663-d0fb-4f4b-b8cb-45c9ab81ef36 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.