The ABC Wasp is an experimental seven cylinder radial engine of 170 horsepower, designed by the noted British engineer Granville Bradshaw. At a weight of 290 lbs., it had one of the most advanced power-to-weight ratios of the day -- 1.7 lbs. per horsepower. This WWI era engine is noteworthy because it was the first in which the cylinders were coated with copper in an attempt to dissipate heat. The ABC Wasp never evolved beyond the experimental stage, but it was the predecessor of the unsuccessful production "Dragonfly" engine.