The Edwards engines were designed by two brothers of this surname, although the construction was carried out by the company H.W. Cowley from the same city of Bolton.

-They were two-, four-, six- and eight-cylinder engines that were made between 1910 and 1911.

-Although these engines were more commonly known as AVRO engines due to the existing association between the Edwards and Avro Roe, who marketed these engines.

-The horizontally-opposed 2-cylinder gave 15 hp at 1,000 rpm and was widely used.

-The 4-cylinder gave 30 hp at the same rpm.

-The six-cylinder delivered 45 hp and the eight-cylinder 60 hp.

-There were two 100 hp Edwards on the Edwards XMBM-1 plane in 1939.

From Appendix 6: Built in 1910 by H.W. Cowley and Co. Ltd in Daubhill, Bolton.

-The Edwards was a horizontally-opposed twin-cylinder that gave 15 hp. It worked with the two-stroke cycle.

-The 30 hp version had four cylinders in the same arrangement. Both cooled by air.

-Another engine was the 45 hp with six cylinders and that is supposed to be a three-body assembly of the former 15 hp engine.

"The Edwards two-cylinder"

From Appendix 7: The engines were built by H. W Cowley & Co. and there were three main types:

-The horizontally-opposed two-cylinder, working with a two-stroke cycle.

-The 30 hp four-cylinder, 30 HP and two-stroke also water cooled.

-The 60 hp Edwards with six cylinders in line, water cooled.

"An Edwards of 60 HP on the well-known Smith Multiplane"
(PiP-fmr)