MiniSteam Halo KitThis is the HALO five cylinder radial. Liney has been developing it as time allowed over the last three years. The intent was to make an external combustion (steam compressed air) design that mimicked the operation of real radial aircraft engines as close as possible. It has cams on the crank which operate the pushrods and in turn the rocker arms and the very unique ball bearing valves. It has five 3 8th inch pistons linked to the single crank via a