In 1921 an Austrian engineer named Edmund Rumpler presented the Tropfenwagen, a particularly aerodynamic design car that unfortunately failed to be mass-produced, at the auto show in Berlin.
The technical department of Benz observed the vehicle with interest and with the advice of Ferdinand Porsche created a car called Typ RH which exploited extremely advanced aerodynamics which also offered other highly technological solutions for the time.
The 90 bhp 2.0 hexacylinder engine managed by a three-speed gearbox was in fact installed in the rear section of the vehicle to improve weight distribution and in the same sector an airscope was mounted to improve engine cooling.
The 2.0 hexacylinder engine
Taken only to the European GP at the Monza circuit by the riders Fernando Minoia, Franz Hörner and Willy Walb, he finished in 4th place obtaining a special recognition from the organizers for the technical innovations proposed. Porsche would later continue the development of similar vehicles in Auto Union, but that's another story.
Thank you to Valentina Zanola for the cooperation