 The novel mounting of the mainwheels proved unstable during taxiing, and was replaced by more conventional V-struts.The engine was prone to overheating, so the propeller spinner had an opening cut into it and a fan installed inside the spinner to help cool the engine.Although it was praised by its pilots, including John Salmond, later to become Chief of the Air Staff, its landing speed of 52 mph (84 km/h) was considered too fast for operational use, and the engine was still too unreliable, being replaced by a 100 hp (75 kW) Gnome Monosoupape rotary engine.