M.Goodall, A.Tagg British Aircraft before the Great War (Schiffer)
Deleted by request of (c)Schiffer Publishing
P.Lewis British Aircraft 1809-1914 (Putnam)
J. Robertson Porter was an exponent of the direct-lift aircraft, and his first machine was shown at Cordingley's Motor Car Exhibition held from 21st until 28th March, 1908, at the Agricultural Hall, Islington, London. A ducted fan system consisting of 5 ft. diameter propellers and eight vanes drew air downwards through a cone structure with an upper opening of 5 sq. ft. Drive from the air-cooled two-cylinder 6 h.p. J.A.P. engine was by means of a clutch and belt transmission over pulleys. It was displayed again in July, 1909, at the Travel Exhibition held at Olympia. Height, 14 ft. Weight empty, 200 lb.