The U 7s took part in several contests. One of the earliest was the August 1924 Rhön meeting for gliders and lightplanes. There were thirty of the latter, though several were motorised gliders rather than sports tourers. The weather was not good, with high winds, and the Kolibri, flown by Udet, was the only one of three powered aircraft to complete the round trip from the Wasserkuppe to Kissingen and back, thus winning first prize. In October 1924 Udet, again starting from the Wasserkuppe, flew the U 7 for 4 hr 39 min, an unofficial record for very light aircraft. There was no official recognition of this class of aircraft at the time.