The speeds that have been attained with sidewall-air-cushion vehicles up to the present are, however, at 20 to 30 knots, very modest.
Isantya esifunyenweyo kwizithuthi zokhuselo-moya zamacala odonga ukuza kuthi ga ngoku, zikumashumi amabini ukuya kumashumi amathathu esantya esilungisiweyo senqanawa.