If a craft fitted with foils of this type heels over or tends to dip downwards due to the effects of some external force, such as wind or waves, the immersed area of the foil will increase at the point to which the craft is inclined.
Ukuba umsebenzi wobugcisa ulinganiswe neentsimbi eziyasuyasu zoluhlobo lwezithende ngaphezulu okanye ithambekela nzulu ezantsi ngenxa yeziphumo zangaphandle ezinje ngomoya okanye amaza, loo ndawo izakwandela kwiqondo lokuba umsebenzi wobugcisa mawunyuke.