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.
There were five (with some sources citing three) production models that differed from the original prototype, featuring ailerons mounted on the middle wing rather than the upper wing, and powered by a Green engine as opposed to the prototype's JAP.