Roma (airship)

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Italian airship Roma over Norfolk VA 1922.jpg
Role Training airship
National origin Italy
Manufacturer Stabilimento Construzioni Aeronautiche (SCA)
Designer Umberto Nobile
First flight September 1920
Status Destroyed in crash 21 February 1922
Primary user United States Army
Number built 1

Roma was an Italian semi-rigid airship, originally designated the T-34. It was purchased by the United States from the Italian government for $250,000 in 1921. It served in the US Army until February 21, 1922, when it crashed in Norfolk, Virginia, killing 34 people. It was the last hydrogen filled airship flown by the US military; all subsequent ships were inflated with helium.

Design and development[edit]

The Roma was designed by Celestino Usuelli, the engineers Eugenio Prassone, Umberto Nobile and Colonel Gaetano Arturo Crocco.[1] It was the first project of the Stabilimento Costruzioni Aeronautiche ("Aeronautical Construction Factory"), as the partnership of Umberto Nobile, Usuelli, Giuseppe Valle and Bennetto Croce was known. The T-34 was designed for trans-Atlantic crossings. It was the largest semi-rigid airship in the world.

As a semi-rigid design it was built about a rigid keel - though the keel was partially articulated to allow some flexibility. The passenger spaces and control cabin were within the keel. The engines, 400 hp Ansaldos, were mounted outside, angled such that the slipstreams would not interfere with each other.


In September 1920 Roma made a trial flight.[2]

After purchase by the US, in March 1921 the Roma flew the 300 miles from Rome to Naples and back carrying the US Ambassador.[3]

After transportation to the US, Roma flew on 15 November 1921 with minor problems.[4]


The wreckage of the Roma burns after it crashed into power lines

The Roma crashed in Norfolk, Virginia during test flights on February 21, 1922. The crash was caused by failure of the airship's box rudder system, which allowed it to maneuver over tight areas. The airship contacted high voltage lines, and burst into flames. A total of 34 were killed, 8 were injured, and 3 escaped unharmed. Among the dead was the airship's pilot, Captain Dale Mabry. The event marked the greatest disaster in American aeronautics history at the time.

1922 newspaper about the Roma crash


Data from [5]

General characteristics

  • Length: 125 m (410 ft 0 in)
  • Diameter: 25 m (82 ft 0 in)
  • Volume: 33,810 m3 (1,193,000 ft3)
  • Empty weight: 34,500 kg (76,000 lb)
  • Useful lift: 19,100 kg (42,000 lb)
  • Powerplant: 6 × Liberty L12, 300 kW (400 hp) each


  • Maximum speed: 128 km/h (80 mph)


  1. ^ Flight (1920)
  2. ^ Flight 23 September 1920 p.1021
  3. ^ Flight 24 March 1921 p.202
  4. ^ Flight 29 December 1921 p.862
  5. ^ "Roma was Largest Semi-rigid Airship" (PDF). New York Times. 22 February 1922. Retrieved 2008-06-19.