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 Waldemar of Prussia (1889–1945) Prince Waldemar of Prussia (1889–1945) Prince Waldemar of Prussia (Waldemar Wilhelm Ludwig Friedrich Viktor Heinrich) (20 March 1889 at Kiel – 2 May 1945 at Tutzing, Bavaria) was the eldest son of Prince Henry of Prussia and his wife, Princess Irene of Hesse and by Rhine. Waldemar married Princess Calixta of Lippe-Biesterfeld (14 October 1895 – 15 December 1982) on 14 August 1919 at Hemmelmark. They had no children, and resided in Bavaria. Waldemar, like his maternal first cousin, Tsarevich Alexei Nikolaevich of Russia; maternal uncle Prince Friedrich of Hesse and by Rhine; and youngest brother Heinrich, suffered from haemophilia.