Lippisch P 13a & Experimental DM-1 (Schiffer Military History): Dabrowski, H.P.: 9780887404795: Amazon.com: Books
Lippisch P.13a, PM Model PM-224 (2004)
Uberschalljager Lippisch P13a und Versuchsgleiter DM-1: 9783790902983: Amazon.com: Books
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We asked a former British technical liaison to assess Germany's Lippisch P 13: coal-powered supersonic wonder plane? | Hush-Kit
Here's why the Lippisch P.13a Mach 2.6 experimental ramjet-powered delta wing interceptor designed by Luftwaffe during WWII is the weirdest aircraft ever conceived - The Aviation Geek Club