S47. Triple tractor biplane, 'The Field Kitchen''

   This development based on earlier tractor biplanes was a twin-engined machine with both engines contained in an extended fuselage under a long cowling. The rear engine was turned round and drove, by chains, the twin propellers mounted on the inboard interplane struts. This engine rotated in the reverse direction to the normally mounted front engine with directly driven propeller. The rear engine was inadequately cooled and the severe heat generated caused the use of the nickname. The crew of two were seated side-by-side.
   McClean tested S47 for the first flight on 24 July 1912, and it was soon taken over by the Navy, becoming T4 later No.4. It was used for experiments with wireless transmission but was not repaired after damage on 22 January 1913.

   Power: Two 50hp Gnome seven-cylinder air-cooled rotaries. The front engine drove a propeller direct, the rear rotating in the opposite direction drove twin propellers by chains.
   Data
   Span 48ft
   Length 41ft
   Area 500 sq. ft
   Speed 60 mph


S53. Twin tractor biplane

   This was to be a machine for McClean with two 70hp Gnome engines which was not built.