The only one who was not stunned was probably only Marin, a time-traveler who had seen the world. He had seen a video of a later catamaran. The catamaran sailing yacht of the other family directly ran at a high speed of 30 knots, which is about the same speed as a modern warship.

However, Marin shook his head, because, he knew the shortcomings of the catamaran......

Sure enough, after several voyages, the catamaran's weakness was exposed - in high-speed sailing, because the left and right hulls are often subjected to different buoyancy, stress moments are prone to occur on the connected beams.

After several voyages, the wooden beam of the experimental catamaran, which connected the two ships, broke directly because it could not stand the strong torque generated by the high-speed voyage...... Fortunately, there was a ship nearby that monitored the speed and rescued the sailors on board, otherwise he would have almost died......

Marin shook his head and didn't say anything, but asked the people at the steel mill to bring the beams made of stainless steel. At the same time, the left and right hulls were made more sharp, and made hollow, and the outside was also wrapped with stainless steel iron sheets, which prevented seawater corrosion and increased strength.

As a result, the speed of this experimental catamaran soared to 25 knots again, and the master craftsmen of communication design were so frightened that they couldn't close their mouths......

Because of the use of steel beams, there were no accidents with broken beams. But here's the thing is - the steel beams of Nima stainless steel are really rare and precious!

All they built was a 10-metre-long test boat, all made of stainless steel beams and skins, which was acceptable. However, if you want to build a big ship, how much stainless steel is needed to make the beams!

In these years, the preciousness of stainless steel is not under gold. Moreover, the chromite discovered by Marin's subordinate Wiltz on the island of Cuba has reserves of only a few hundred thousand tons, and he does not dare to squander it.

Therefore, everyone knows that the speed of the catamaran is very awesome, but they can only sigh - the stainless steel beams that are not afraid of seawater corrosion cannot be built......

In the end, the master craftsmen of the military shipyard of the Beihai State could only keep the 10-meter-long catamaran speedboat that made extensive use of stainless steel for testing and research. As for promoting construction, that's unrealistic.

And through the wonderful test of this stainless steel structure catamaran speedboat, those masters also believed that Marin said that it was three times the speed. Because, when this catamaran was tested, the speed against the wind was really much faster than that of a conventional sailboat, several times faster. In this way, the overall speed is three times that of a conventional vessel, which is also normal.

The only problem is that in high-speed sailing, the large difference in buoyancy between the left and right hulls leads to a high requirement for the strength of the beam connecting the left and right hulls. In addition, the corrosiveness of seawater is very strong, and at most a small catamaran speedboat with a displacement of several tens of tons can be built. If you want to make it bigger, there won't be so many stainless steel beams available.

In fact, if there is a waterproof paint, it is also possible to use ordinary steel beams. But in this era, there was no waterproof paint, and only steel beams made of stainless steel could be used as beams for catamarans. Therefore, the cost of construction is very high, and the ship construction is not large.

But it is still possible to keep a few catamarans for the dissemination of confidential information. As for the leakage, as long as the curtain is covered on the hull, the mystery of the catamaran cannot be seen from a distance.

Moreover, even if others see the mystery of the catamaran, they will not be able to build it. Marin's master shipbuilders had tested it before - the wooden beams were easy to break during navigation...... The metal beams must be resistant to seawater corrosion......

In the end, only the master craftsmen under Marin could build such a catamaran speedboat, and they could not build it by much.

In short, even if this technique is learned, it will not be used. There is no way, the problem of stress on the beam of the catamaran, not to mention this era, is also a big problem in shipbuilding in later generations. So, despite the discovery of Polynesian catamaran canoes, the technology has not been able to be applied to the construction of large ships. It was not until the late 20th century, when technology reached a certain level, that the construction of pure steel catamarans began. This kind of steel ship with an integral structure can avoid the problem of insufficient strength of the catamaran beam.

Therefore, Marin is not afraid of others learning the skills of catamarans, because they can't use them if they learn them. On the contrary, it is the clipper boat technology and the underwater stabilizer fin technology, because the principle is too simple and there are no restrictions on the materials, Marin is worried that others will steal it.

But what frightened Marin was that the 50-ton stainless steel catamaran he used for testing was actually taken by Caesar, who shouted that he would sail to London and take Margaret's sister to the sea......

Marin was so angry that he beat Caesar, why? Because it's so dangerous!

Although it is said that the catamaran with an all-stainless steel construction is very safe and smooth. However, if it does encounter a great storm at sea, it is just as dangerous. After all, because of the material, this ship can only build a displacement of tens of tons, and its ability to resist wind and waves is limited.

Caesar was his heir, and if he had taken Princess Margaret out to sea and hung up, that day would have collapsed......

Therefore, Marin did not hesitate to beat Caesar and asked him to say 10,000 times in Chinese, "A gentleman does not stand under a dangerous wall......

But Caesar is a teenager after all, and he likes catamarans very much, which are very "cool" and very fast, and it is normal to want to take his female companion out to sea to go to the waves.

Moreover, this kid is very smart, and for Marin's concerns, he directly suggested - the construction of 5 stainless steel catamarans with a displacement of 50 tons is. 5 ships act together, even if the one he is riding in is in danger, there are always others who can be rescued.

In addition, Kaiser proposed that the upper edge of the jill sail be fitted with a diesel engine propeller system at the rear of the stainless steel sailing catamaran speedboat. In this way, when encountering a larger storm, it is completely possible to lower the sails and use the diesel engine to drive......

"Yo ho, isn't this the design of the rich and handsome catamaran yachts of later generations?" Marlin was surprised.

In later generations, many wealthy people played catamaran sailing yachts that were equipped with diesel engines at the same time. When the sail is not in use, it can run at a speed of more than a dozen knots.

However, the family uses a single Mercury engine with a single on-hook horsepower of more than 250 horsepower, and the horsepower is not comparable to the 12-horsepower single-cylinder diesel engine currently owned by Beihai State.

After testing, even if four 12-horsepower single-cylinder diesel engines are installed in parallel, without the use of sails, the catamaran can only run at a speed of seven or eight knots, which is a big gap with a machine running more than a dozen knots. Of course, being able to run this speed without sails is already a shock to many people.

In addition, because the catamaran has a low side, the diesel engine is prone to seawater when "jumping" at sea. Therefore, in order to prevent corrosion, it is necessary to use stainless steel to manufacture the shell of the diesel engine, which greatly increases the cost

"Dad, hurry up and get the other four sailing catamarans built! I'm going to London with a catamaran yacht to take Sister Margaret out to sea! Caesar acted like a swinger, leaving Marin dumbfounded.

"This kid ...... Well, have you reached the age of Form 2? Marin thought about it, it seemed to be true. Caesar is now 14 years old, which is exactly the age of Form 2......