https://www.jalopnik.com/know-thy-germans-1921-rumpler-tropfenwagen-a-slippery-223396/
Know Thy Germans: 1921 Rumpler Tropfenwagen, A Slippery Tugboat
May 16, 2013 - Lady and gentlemen, we present for your viewing pleasure, a creation of Edmund Rumpler. This mid-engined mechanical marvel, the product of wartime aviation...
rumpler tropfenwagenknowthygermansslippery
https://transpressnz.blogspot.com/2026/03/a-look-at-1921-rumpler-tropfenwagen.html
transpress nz: a look at the 1921 Rumpler Tropfenwagen
Tropf means a drop as in a waterdrop.
look attranspressnzrumpler