BRADSHAW made a motorcycle engine that was used in the construction of English ultralight aircraft. This engine was presented at the 1923 Lympne light aircraft trials.

From appendix 6: The Bradshaw engine mentioned in the main text does not have images for not being available at the time of writing.

-After a major investigation, now we do have images of this little engine, whose main feature is the cylinder cooling.

-From central block of the crankshaft only the cylinder heads stick out, while the cylinders themselves are within the housing, bathed and cooled by the relatively colder oil.

-This is shown in the illustration below.

"Bradshaw with open crankcase”

"Bradshaw flywheel side view"

-As we can see, it had simple ignition. Its displacement was 500 cc and the engine delivered 12 hp at 3,600 rpm with the capacity of reaching 18 hp with successive improvements.

"Rear view of the same engine"

-We also obtained a drawing of this previous view.

"Bradshaw drawing"

-We now have some more information from Bradshaw.
Mr. Granville Eastwood Bradshaw was more popularly known for his very interesting innovative motorcycle designs, like the opposed-cylinder engine of this same page.

-During the First World War they made the ABC "Dragonfly" radial engine.

-A summary from the RealClassic book on his person regarding his aeronautic variant, could be the following:

-We present a Bradshaw motorcycle, although this linear motor is not referred to in the text about aeronautical use, (That was the horizontally-opposed 2-cylinder engine mentioned in the beginning of the text).

“Bradshaw motorcycle in perfect condition” (PiP)

-As for the ABC "Dragonfly", it seems that it was built until 1939 by various parties.

“Bradwhaw ABC Dragonfly” (PiP)

-However, a surprising discovery is that of a toroidal Bradshaw engine.

-It seems that shortly after WWII he was developing this type of engine.

-He made several prototypes but none came into production.

“Interesting toroidal Bradwhaw engine” (PiP)

-You can find more information in Bradshaw's Biography: Granville Bradshaw: a flawed genius? by Barry Jones that was published in 2008.

-We now have a drawing of the toroidal motorcycle engine that is mentioned in the main text. This drawing comes from the brand's catalog.

-In this publication there appear several toroidal engines, (similar to Baradat-Esteve) with oscillating pistons, whose movements become rotating through ingenious mechanisms.

-As it is clearly shown in the illustration below.

"The toroidal Bradshaw"