On March 7, 1949, the Milanese driver Carlo Leto di Priolo improved the previous world speed record held by Achille Castoldi in the 450-kilo racers class with a speed of 139.164 km/h on the waters of the Idroscalo Ambrosiano.

After 2 months Castoldi takes back, again at the Idroscalo, the speed record on the kilometer launched of the aforementioned class with Km/h 151.923. Castoldi has at his disposal in this circumstance a new hull from the Picchiotti shipyards "Arno V" equipped with an Alfa Romeo 158 8-cylinder 1500 cc engine with a Root dual-stage compressor.
This latest feat makes Castoldi the fastest Italian motorboater on the water, before him to hold high the national colors was Guido Cattaneo and his legendary "Asso" who recorded in Arona (Lake Maggiore) on the kilometer launched an average of Km/h 150.630.

In the 1940s, in the United States, the inboard classes followed the development of a hull with revolutionary characteristics invented by the Americans Adolph and Arno Apel: the three-point.
This new type of hull had already been conceived in 1936, but was actually introduced into American racing only in 1944.
The first three-points, however, sailed with the stern resting on the water, leaving the drive shaft, the propeller and the rudder completely immersed, with obvious problems of resistance to advancement.

In 1949 the Los Angeles driver Robert Bogie took part in the Italian races in Trieste and became champion with a three-point boat from the Campbell shipyard powered by a Ford V8.
The innovative hull, named "Blitz III", had the particularity of using the propeller as a rear support point: the same, working semi-submerged, gave the hull a practically horizontal trim and a considerable increase in speed.
One of the characteristics of this important technical solution was the spectacular wake of water that the hull left behind: this obviously did not escape the astonished Italian technicians and pilots who from that moment began a frenetic series of experiments, led in particular by the great champion Ezio Selva and the builders Guido Abbate and Carlo Timossi.
The studies were concentrated on the propeller and its particular design and in a short time new hulls with a three-point hull were built and the results, as we will see, were not long in coming.

The 1950s marked the beginning of the golden age of Italian motorboat racing, which saw other exceptional and daring racers "set the waters of the world alight" with their victories, winning unique competitions in their history and achieving further new speed records.

Furthermore, with the birth of new inboard categories and related championships, considering it a motorboat sport worthy of consideration, the commitment of national car manufacturers, already suppliers of engines for motorboat use, is also increasing: above all Ferrari, Maserati, Alfa Romeo.