 The first five monoplanes were basically similar, and were powered by R.E.P engines, with the fifth one having a deeper fuselage.The sixth aircraft, built for the 1912 British Military Aeroplane Competition was noticeably different, with side-by-side seating for its two crew, a shorter wingspan (35 ft (10.67 m) rather than 47 ft 6 in (14.5 m) for the earlier aircraft), while a 70 hp (52 kW) Viale radial engine was fitted.The seventh aircraft reverted to the tandem layout and longer wingspan of the first five aircraft, but replaced the R.E.P.