Thus by opening and closing the rudder plates, the boat can be made to move ahead or astern at full, half, or slow speed.
Ngokunjalo nokuvula nokuvala kwepleyiti yephini lokuqhuba inqanawa, isikhephe sinokwenziwa siye phambili okanye ngasemva ngesantya esipheleleyo, esiyihafu, okanye esicothayo.