This is a technical drawing showing the principle of the Tragflugelabsauganlage (wingsucksionsystem) for the Do-24 that was designed by Luftschiffbau Zeppelin-Friedrichshafen and reported on October 15th 1944. It was an installation that sucked air in and pushed air out to improve lift. There was one set of wings fitted to a Do-24T during the final stages of the war and it is reported that the plane even flew under the designation Do-318.