sentences:  The A.W.35 Scimitar was a development of Armstrong Whitworth's earlier Armstrong Whitworth A.W.16 fighter, powered by an Armstrong Siddeley Panther engine, with a lowered nose decking and an enlarged fin and rudder.The first prototype "(G-ACCD)" was a modification of the second A.W.16, and first flew in this form on 29 April 1935.A second prototype ("G-ADBL") was constructed by converting another A.W.16.