Prince Henry of Prussia (1862–1929) became the club's patron. Henry was interested in motor cars as well and supposedly invented a windshield wiper and, according to other sources, the car horn. In his honor, the "Prinz-Heinrich-Fahrt" (Prince Heinrich Tour) was established in 1908, like the earlier Kaiserpreis a precursor to the German Grand Prix. Henry and his brother William gave patronage to the Kaiserlicher Automobilclub (Imperial Automobile Club). Henry also was an early proponent of introducing submarines and airplanes. He had merchant ships converted into seaplane tenders for operations in the Baltic Sea. Henry respected his brother, but this attitude was not returned in the
Prince Friedrich Sigismund of Prussia (1891–1927) Princess Victoria Margaret, Prince Friedrich Karl, and Prince Friedrich Leopold. Like some other Hohenzollerns like Prince Heinrich of Prussia, Friedrich was greatly interested in aviation. In 1911, he began building an aeroplane at Glenicke Castle, with the hopes of trying it out the following spring. In 1917, he and his brother Friedrich Karl joined the German flying corps. Later that year, his brother died from war wounds. On April 27, 1916 he married at Jagdschloss Klein-Glienicke in Berlin Princess Marie Louise of Schaumburg-Lippe (a daughter of Prince Friedrich of Schaumburg-Lippe and Princess Louise of Denmark). They had two children: He