sentences:  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.One example was sold to the Harvard Aeronautical Society, one was exported to the United States, and two others suffered a curious fate while "en route" to the 1910 Blackpool Meeting - sparks from the steam locomotive taking them to Blackpool set fire to the aircraft.Roe was able to quickly replace them with new aircraft built from spare parts.