A propulsive device consisting of a boss or hub carrying radial blades, from two to four in number. The rear or driving faces of the blades form portions of an approximately helical surface, the axis of which is the centre line of the propeller shaft.
Isixhobo esiqhubela phambili esinesihombiso esithwele iibleyidi zommandla, ukusuka kwisibini ukuya kwisine ngenani.