/r/WeirdWings
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A Lockheed Mach 5 concept from circa 1981/1982, possibly an airliner. From https://www.secretprojects.co.uk/threads/lockheed-adp-nasa-langley-1990-mach-4-mach-5-methane-fueled-aircraft-studies.1967/
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Nene-Lancastrian VH742 with its outboard Merlin engines replaced with Rolls-Royce Nene turbojets pictured in 1946
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