X-Plane 11.25+ WDL-1B 1.1. The WDL-1B is a non-rigid airship built by the Westdeutsche Luftwerbung (WDL) Airship Company during the 1960s. Information on this model of airship is scarce, but it is 197 feet long and is powered by two Continental IO-360 engines, the same engines used in the GZ-20. It can fly up to 58 knots and it is still operated today. This aircraft includes four liveries, custom sounds and a 2D panel. Please see the included 'Readme' file for more information. Changes made in the 1.1 update: resized liveries to the proper 2048x2048 size, plus added two additional liveries. By Cynderdragon.