Shortly before the ending of war firm "Messerschmitt " has developed interesting single-engine fighter. The wing had a sweep 45 deg.
  In some sources it is informed, that the angle of sweep in flight it was possible to change within the limits of 35-45 deg. In my opinion this was clean a prototype airplane is constructed for definition of an optimum angle of a sweep and for this purpose the airplane had a wing changed the angle of a sweep on the ground. In this case the question on change in flight of an angle of a sweep did not stand.