Hauātea:
He momo hou te pūwero ru hau i whakawhanakehia mai i te tekau tau atu i 1960. Ko te tauira whai huatanga e tohuhia ana e te mea ka tāutahia he piston mānu ki te wāhanga o raro o te oko rango, ā, ka whakakīia he rūma hau kati i hangaia e te piston mānu, ā, ka whakakīia tetahi pito o te oko rango ki te hauota pēhanga teitei. Ka tāutahia he mowhiti-O nui ki te piston mānu, e wehea katoatia ai te hinu me te hau. Kei te piston mahi he takirere kōpeketanga me he takirere toronga e whakarerekē ana i te horahanga whakawhiti o te awa me tōna tere neke. Ina peke ake, ina peke iho te wira, ka neke te piston mahi o te pūwero ru ki mua, ki muri i roto i te wai hinu, ka hua ake he rerekētanga pēhanga hinu i waenga i te rūma o runga me te rūma o raro o te piston mahi, ā, ka panaia e te hinu pēhanga te takirere kōpeketanga me te takirere toronga ka rere ki mua, ki muri. Nā te mea ka puta he kaha whakaiti nui ki te hinu pēhanga e te takirere, ka ngoikore te wiri.
Waipēhi:
He whānuitia te whakamahinga o te pūwero ru waipēhi i roto i te pūnaha whakatārewatanga motuka. Ko te kaupapa matua, ina neke whakamua, ina neke whakamua te anga me te toki, ā, ina neke whakamua, ina neke whakamua te piston i roto i te oko rango o te pūwero ru, ka rere tonu te hinu i roto i te whare pūwero ru mai i te kōhao o roto ki tētahi atu kōhao o roto mā roto i ētahi pūwero whaiti. I tēnei wā, ka hangaia e te waku i waenga i te wai me te pakitara o roto me te waku o roto o ngā ngota wai he kaha whakaiti i te wiri.
He rite tonu te ingoa o te pūwero ru o te motuka. Ehara i te mea uaua te kaupapa matua, arā, kia tutuki ai te pānga o te "ngoikore ru". Ko ngā pūnaha whakatārewatanga motuka he pūwero ru te nuinga o te wā, ā, he whānuitia te whakamahinga o ngā pūwero ru porotaka rua-ara i roto i ngā motuka. Ki te kore he pūwero ru, kāore e taea te whakahaere i te pekepeke o te puna. Ina tūtaki te motuka ki te huarahi taratara, ka puta he pekepeke nui. Ina koki ana, ka ngaro hoki te pupuri me te aroturuki o te potae nā te wiri o te puna ki runga, ki raro hoki.
