This horizontally-opposed two-stroke engine uses the crankcase as a pump to draw in and partly compress the mixture. An unusual feature is the use of shallow grooves in the cylinder wall which act as transfer ports and pass the mixture to the combustion chamber via holes in the piston skirt.
One of these engines was supplied by A.V. Roe to Lillian Bland, the first woman to fly in Ireland. The engine appears to have been designed and manufactured by a Bolton engineer, HF Cowley
We have a similar engine on display at Brooklands Museum in Weybridge. It is described as a Cowley Edwards as used by Lillian Bland. It also notes that these engines were marketed by AVRO although ours does not have the AVRO name on it.
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