The Roma was designed by Celestino Usuelli [it], the engineers Eugenio Prassone, Umberto Nobile and Colonel Gaetano Crocco.^[1] Designated and advertised as the Model T-34, it was the first project of the Stabilimento Costruzioni Aeronautiche ("Aeronautical Construction Factory"), for the partnership of Nobile, Usuelli, Croce and Giuseppe Valle.^[2] The T-34 was designed for trans-Atlantic crossings carrying up to 100 passengers, though initially fitted for 25.^[1] When constructed, Roma was the largest semi-rigid airship in the world.^[2]

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 Ansaldo 4E-2940 V-12s,^[3] were mounted outside, angled such that the slipstreams would not interfere with each other.^[1]

Roma made its first trial flight in September, 1920.^{[4][URL required, verification needed]} The airship was purchased by the United States Army Air Service for $184,000 (equivalent to $3.1 million in 2023).^[3] During the inspection and delivery ceremonies in March, 1921, the Italians took the new owners of the Roma on a 300-mile (480 km) demonstration flight from Rome to Naples and back. Aboard the dirigible were the US Ambassador to Italy, his wife and several Army officers. The passengers were served lunch while flying over the island of Capri.^{[5][URL required, verification needed]}

The Army originally planned to fly the Roma to the United States, but instead the airship was dismantled, packed in several crates and transported by ship, arriving in the US in August, 1921. When the Army unpacked the crates after their arrival at Langley Field, they found the airship's fabric outer cover had mildewed and weakened.^[6] After being reassembled with some difficulty by US Army Air Service crews at Langley, Roma flew in America for the first time on November 15, 1921, with minor problems. On a subsequent flight, a propeller disintegrated, ripped open the envelope and slashed a gas bag; the dirigible managed to return to Langley Field safely.^{[7][URL required, verification needed]}

During a flight to Washington, D.C., on December 21, 1921, the Roma experienced several engine breakdowns due to the extremely cold weather. After the return flight to Langley was made on only four engines, the original Italian Ansaldo engines were replaced with six Liberty L-12's.^[2]

The Roma crashed in Norfolk, Virginia during a test flight on February 21, 1922. The airship left Langley Field around 2:00 PM with 45 people on board, most of whom were US Army airmen. There were also a few civilians, including mechanics and government observers. After lifting off, the pilot, Captain Dale Mabry, set a course along the shore of Chesapeake Bay that took it over Buckroe Beach, and Fort Monroe, before crossing Hampton Roads and passing over Willoughby Spit en-route to the Norfolk Navy Base.^[6] The crash of the Roma was caused by failure of the airship's box rudder system, which allowed it to maneuver over tight areas. Witnesses reported seeing the entire box rudder slip sideways, and the then-uncontrollable airship flew straight into the ground at the Army's Norfolk Quartermaster Depot (now the location of Norfolk International Terminals) from an altitude of 1,000 feet (300 m). Just before the bow struck the ground, the Roma contacted high-voltage power lines and burst into flames. A total of 34 people were killed, 8 were injured, and 3 escaped unharmed. Among the dead was Captain Mabry. The crash of the Roma marked the greatest disaster in American aeronautics history up to that time.

Master Sergeant Harry A. Chapman earned the Cheney Award for his heroics during the crash. He was the first recipient of the award, which was presented by President Calvin Coolidge in 1928.

Although it was America's worst aviation disaster at the time, a century later the crash of the Roma has largely been forgotten, eclipsed by the Hindenburg disaster, which occurred 15 years later and effectively ended the airship era. At Langley Air Force base, the spot where the massive hangar that housed the Roma once stood is now a parking lot; it is still known as the "LTA" ("lighter than air") area, and the base's Roma Road is named in memory of the ill-fated airship.^[6]

Data from ^[2]

General characteristics

• Length: 125 m (410 ft 0 in)
• Diameter: 25 m (82 ft 0 in)
• Height: 28 m (92 ft)
• Volume: 33,810 m³ (1,193,000 cu ft)
• Empty weight: 15,400 kg (34,000 lb)
• Max takeoff weight: 34,500 kg (76,000 lb)
• Useful lift: 19,100 kg (42,000 lb)
• Powerplant: 6 × Liberty L12 , 300 kW (400 hp) each

Performance

• Maximum speed: 128 km/h (80 mph, 70 kn)
• Cruise speed: 90 km/h (56 mph, 49 kn) ^[1]
• Range: 4,800 km (3,000 mi, 2,600 nmi) ^[1]

• Caliaro, Luginio (January 2021). "The Short Tragic Life of the Airship Roma". The Aviation Historian (34): 50–57. ISSN 2051-1930.
• "The "Roma" Disaster", Flight, XIV (688): 140, 2 March 1922, archived from the original (pdf) on 6 March 2016, retrieved 20 August 2011
• Tampa Times, February 22, 1922. Page 1.
• Smith, Alfred Emanuel; Walton, Francis (March 3, 1922). "The Destruction Of The Roma". The Outlook. Vol. 130. pp. 369–370. Retrieved 2009-07-30.