Mar a tha innealan radial "daingnichte", chaidh rotaran a thogail le àireamh neo-chumanta de shilindrichean (mar as trice 5, 7 no 9), gus an robh òrdugh lasadh gach-piston eile cunbhalach a chumail suas, gus ruith rèidh a thoirt seachad.
5, 7 no 9)