Named The Incredible, the I.C.1 was completed during the Club's summer camp at Gore Farm, near Shaftesbury, in September 1930.
[1][Note 1] The I.C.1 had a straight, constant chord, thick section wing built around two spruce box spars with plywood webs.
[3] The fuselage was an open frame structure with two horizontal, parallel booms that ran rearwards from the wing spars to the tail, where two cross braces carried the tailplane.
[2][3] The pilot's seat and control column were mounted, unenclosed, on the lower beam ahead on the wing; below him a shallow, curved member served as a keel for landing.
The lower beam also provided an attachment point for lift wires, one on each side, to the forward wing spar.