Nkọwa dị mkpirikpi:

Igwe a dabara adaba maka ịkpụ ọrụ tii ojii na tii tii agbajiri agbaji.Akwụkwọ ọhụrụ ahụ na-agafe n'ime embrayo tii akpọnwụwo ma ọ bụ nke mbụ.Akwụkwọ tii na-abanye n'ime oghere igwe site na spiral propeller, na tii na-ahapụ n'okpuru nkwado nke propeller na tube mgbidi mgbidi.A na-agbanye ya na ntụgharị siri ike na ntụgharị, ma na-egbutu ya site na diski cutter, wee tinye ya na mkpali kwesịrị ekwesị nke efere n'akụkụ ọgịrịga iji wepụ oghere igwe.