A new stage in the development of these craft was introduced in 1935 when the Soviet scientists Keldely and Lawrentjew produced a complete theory for hydrofoil craft.
Iqondo elithsa kwiniveliso yezinqanawa yavezwa ngo1935 ngexa isazinzulu uKeldely kwakunye noLawrentjeni baseSoviet bavelisa inkcazo yengcingane epheleleyo yenqanawa enamaphiko ayinyusayo ukuze ihambe kakuhle.