In other words the energy required to produce the lift needed for such a flying machine is much lower close to the surface of the water than is required for a normal aircraft.
Ngamanye amazwi amandla afunekayo ukwenza unyuko loluhlobo lomatshini obhabhayo lusezantsi kakhulu, kufutshane nomphandle wamanzi kunokufunekayo kwinqanawa yomoya yobugcisa ebhadlileyo.