The Balloon Factory, under the direction of Mervyn O'Gorman, was authorized only to repair a crashed experimental 60 h.p. E.N.V. Bleriot monoplane. In seeking authorization to carry out repair work, he asked that it cover reconstruction as well, and when this was granted the Factory at last had the all clear they wanted to exercise the ideas of their own designers. So far as the Bleriot was concerned, all that remained of it by the time that Green and de Havilland had finished with it was the 60 h.p. E.N.V. engine. By the time the "repair" work was finished it had turned into a tail-first biplane classified S.E.1 - the "S" standing for Santos-Dumont, in deference to the inventor of the tail-first formula. (As the S.E.1 was the only tail-first type built by the Factory, the letters S.E. were later taken to mean Scout Experimental.).
Engine: 1 x 60-h.p. E.N.V., "F"
Span: 38ft 0in
Loaded wt: 1,200 lb