The problem is that Weißkopf occasionally made contradictory statements about his flights and apparatus. In contrast to the Wrights, he does not seem to have documented his experiments in detail. There are no pictures of "No. 22", so opponents of Weißkopf speculate that it never existed. It is interesting to note that Whitehead/Weißkopf did not apply for a patent for an "Aeroplane" ( pdf-Datei US881837A) until December 1905 - but this was a glider without an engine. He also registered the same glider in Great Britain( pdf-Datei GB190805312A), France and Austria. The Wrights on the other hand - professionals in PR as well as in IP! - had already filed a patent on their flyer ( pdf-Datei US821393A (1,22 MB), "Flying Machine") before making their first flights in Kitty Hawk. Later they submitted many more applications (e.g. pdf-Datei US1075533A, pdf-Datei US1122348A). Property right management and PR do not seem to have been among Weißkopf's strengths, nor does commercial intuition. But maybe he didn't have much interest in self-marketing either, because he had the feeling that he hadn't yet reached his ambitious technical goals: "The flights are all useless because they don't last long enough," he is reported to have said. "Flying will only take on meaning if we can fly to any place at any time."