The five (some sources give three) production machines differed from the prototype in having the ailerons fitted to the middle wing (the prototype's were on the upper wing) and in being powered by a Green engine in place of the prototype's JAP.
The five (some sources give three) production machines varied from the prototype in having the ailerons attached to the middle wing (the prototype's were on the upper wing) and being driven by a Green engine instead of the prototype's JAP.