The Goodyear Type AD was a small airship built in the United States in the mid-1920s.
Originally intended for pleasure cruising, it soon found its true calling as a promotional vehicle as the first "Goodyear Blimp" in a line that has continued for over ninety years.
The Type AD was a conventional blimp design with a gondola that could carry two passengers in addition to the flight crew.
While usually described as a non-rigid type, the design in fact incorporated a triangular-section magnesium girder as a keel, fastened inside the envelope.
A contemporary article in Flight describes the original intentions behind the design as: It is claimed that there is a great future for this type of airship, and its mooring masts should be found at country clubs, private estates, etc., while the holding of airship regattas—in the same way that motor boat and yachting clubs now have similar events—can also be held with success.