1929(Neptun L 7)
- Designation: R100
- Dimensions: 720 x 133 ft.
- Gas Volume: 5.156 million cu. ft. of hydrogen
- Engines: 6 Rolls Royce Condor IIIB 12 cylinder 650hp gasoline engines = 82 mph
- Passengers: 100
- Crew: 37
- Builder: Airship Guarantee Company (Vickers), Howden, Yorkshire
- First flight: 16 Dec 1929
- Service: The private counterpart to the government-built R101 designed by Barnes Wallis. Based at government airship establishment at Cardington, Bedfordshire for trials. Made a trans-Atlantic flight to Canada in July 1930, reaching Saint-Hubert, Quebec in 78 hours. Return flight in August took just 58 hours. After the crash of R101, the British rigid airship program was terminated and R100 was sold for scrap in Nov 1931.