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 Henry of Prussia (1900–1904) would die. He was suffering from Brain haemorrhage. He lingered for a couple of hours, but died the following day, on 26 February. He was only four years-old. Prince Heinrich's premature death would later very much affect the Princess, who would withdraw into herself. One of his older brothers, Prince Waldemar, also had haemophilia. He lived up to the age of 56 and even married, but, due to his condition, never had any children. The middle sibling, Prince Sigismund, was unaffected by the disease. Prince Henry of Prussia (1900–1904) Prince Heinrich of Prussia, (; 9 January 1900 – 26 February