the hyper engine was a possible aircraft engine model that could produce 1 horsepower per cubic inch of engine displacement. the term hyper engine was used only in the united states, where the army air corps gave people money to make a hyper engine that had an area of 1,300 cubic inches. this happened in the 1930s. they thought that this would better help with streamlining and to help get a better range. unfortunately, none of these designs ever made it past the production stage.