Manchester-based woodworking firm which acquired a license to produce the Czechoslovakian Praga E.114 Air Baby two-seat lightplane. Thirty manufactured from 1936, known as Hillson Pragas. A single Hillson Helvellyn two-seat, mid-wing lightplane was built and flown in 1939 and one Hillson Pennine was produced, but not flown before the outbreak of war. During Second World War the company was involved in contract work for the Air Ministry, and developed an experimental "slip-wing" conversion of the Hawker Hurricane to enable the aircraft to take off at greater than normal gross weight, releasing the upper wing in flight.

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