This radial engine from the UK features a single rocker box that houses both the intake and exhaust rockers, and uses only one large tube to enclose both pushrods. It has a bore of approximately 1 inch and a stroke of 1 inch for a total displacement of about 2.35 cubic inches. It runs on a homemade electronic spark ignition and burns gasoline or methanol with oil mixed in for lubrication. The engine is 5”-long, 12”-wide, 9”-high, and weighs 7 lbs.