Even if the whole propeller is immersed the effect is similar to that caused in a merchant ship in ballast when the blades actually come out of the water at the top of their travel.
Nokuba iziqhubi zonke neziphumelo eziyeleleneyo kule yenza urhwebo ngenqanawa kwiballasti xa izikhali zithanda ukuza ngaphandle kwamanzi aphezulu kuhambo lwabo.