31. Goodyear Airship Operations has officially planned to start production of Zeppelin NT semi-rigid airships beginning in 2013. 32. Within two years of each other contributed to the cancellation of the Navy s rigid airship program. 33. In 1921, the rigid airship " R38 " was sold by Britain to the United States Navy. 34. Rigid airships are often commonly called Zeppelins.35. He created the first flyable rigid airship . 36. The enormous, rigid airship had become a familiar but still fascinating sight along the New Jersey coast. 37. It was founded on 16 November 1909 and operated Zeppelin rigid airships manufactured by the Luftschiffbau Zeppelin Corporation. 38. In the'30s, however, all that changed when Germany built the largest rigid airship ever constructed, the 804-foot Hindenburg. 39. Their semi-rigid airships were considered useful for military purposes and several were ordered by the French War Ministry. 40. :: : Tagishsimon is correct about the separate bags of gas with dirigibles / zeppelins ( rigid airships ).
