Designed by Charles Benjamin Redrup and manufactured in partnership with Alban Williams by the Barry Motor Company, the engine was a two-cylinder supercharged rotary engine.
The driver was protected by a colander-type perforated cage, which enabled cooling air to reach the cylinders.
The engine was reviewed by a number of journals at the time.
[1] Later models of the motorcycle dispensed with the pedals and the engine was lowered to improve the centre of gravity.
No known models of the engine exist, but a similar Redrup 1912 rotary aircraft engine is in the Manchester Museum of Science and Industry and later Redrup Radial engines designed and built by Redrup are still in existence.