Beardmore Inflexible
The Beardmore Inflexible, also known as the Rohrbach Ro VI, was a three-engined all-metal prototype bomber aircraft built by William Beardmore and Company at Dalmuir, Scotland. Design and development. William Beardmore and Company had acquired a licence for the use of the Rohrbach principle for stressed-skin construction. Using these principles and drawings supplied by Rohrbach for the RoVI, the Beardmore company built a massive all-metal three-engined transport, the "Beardmore Inflexible". The aircraft was built in sections at Dalmuir between 1925 and 1927 which were shipped by sea to Felixstowe and from there delivered  by road to the Aeroplane & Armament Experimental Establishment (A&AEE) at Martlesham Heath Airfield where it first flew on 5 March 1928. It appeared at the Hendon RAF Display later in the year. The aircraft was structurally advanced for its time and had good flying qualities. It was also a very large aircraft for the time, having a wingspan of - around greater than the Boeing B-29 Superfortress heavy bomber of World War II. However, with an all up weight of it was underpowered and, with no interest forthcoming from the RAF for a production contract, the aircraft was dismantled at Martlesham  Heath in 1930. It was then examined for the effects of corrosion on light-alloy stressed skin structures. One of the aircraft's wheels survives, and is on exhibit in the Science Museum, London.