https://en.wikipedia.org/wiki/Gottlob_Espenlaub

Gottlob Espenlaub (25 October 1900 – 9 January 1972[1]), nicknamed
Espe, was an inventor who specialized in early types of aircraft, specifically
gliders and rocket propulsion systems designed for them. He invented a number of
different aircraft, focusing on tailless designs. Espenlaub co-founded the
practice of aerotowing.

Thanks to Tomas Pellicci.