PERCIVAL Parseval I biplane (N.S. Percival, Hangar No.2, Brooklands)

   This machine was a further reconstruction of the biplane built by Eardley Billing, which was itself a reconstruction of a Voisin. During early trials it was reported to be difficult to fly, attributed to the replacement of the ailerons with warping control, and the fact that the fore and aft balance was incorrect. The latter defect was corrected by moving the fuselage by four inches in relation to the wings.
   The machine was flown by Percival from the 16 August 1911 and, despite odd damage occurring, was successfully used for instructional work until April, when more extensive damage took place. In August the machine reappeared, after repair, fitted with the new Adams-Dorman engine for flight testing. This engine failed to attract interest and by October Percival had transferred his interest to a Caudron and later to the Dunne tailless aircraft.

   Power:
   40hp ENV type D eight-cylinder water-cooled vee
   60-80hp Adams-Dorman eight-cylinder water-cooled vee from August 1912