The only one who was not shocked was probably Marin, a time traveler who had seen the world. He had watched a video of a catamaran sailing ship in later generations. The catamaran sailing yacht ran directly at a high speed of 30 knots, which was almost the same as a modern warship.
However, Marin shook his head because, he knew the shortcomings of the catamaran...
Sure enough, after sailing a few times, the weakness of the catamaran was exposed - during high-speed navigation, because the buoyancy on the left and right hulls often suffer different buoyancy, and stress moments are easily generated on the connected beams.
After sailing several times, the catamaran wooden ship used for the experiment connected the wooden beams of the two ships, which could not stand the strong torque generated by high-speed navigation, broke directly... Fortunately, there was a ship monitoring the speed nearby, which rescued the sailors on the ship, otherwise they would have almost died...
Marin shook his head and said nothing, but asked the people from the steel mill to send stainless steel beams. At the same time, the two hulls on the left and right were sharper and made into hollow. The outside was also covered with stainless steel sheets to prevent seawater corrosion and increase strength.
As a result, the speed of this experimental catamaran soared to 25 knots again, which scared the masters of communication design so much that they couldn't even close their mouths...
Because of the use of steel beams, there was naturally no cross beam breaking accident this time. But the problem is - Nima stainless steel beams are really rare and precious!
What they built was only a 10-meter-long test boat, all of which were made of stainless steel beams and outer skins, which were acceptable. However, if you build a large ship, how much stainless steel would you need to make the beams!
Nowadays, the preciousness of stainless steel is not under gold. Moreover, the chromite mine discovered by Marin Wiltz on Cuba Island has only a reserve of hundreds of thousands of tons, so I dare not waste it.
Therefore, even though everyone knows that the catamaran has a very awesome speed, they can only sigh that stainless steel beams that are not afraid of seawater corrosion cannot be built...
In the end, the masters of the Beihai Guo military shipyard could only retain the 10-meter-long catamaran sailing speedboat that used a large amount of stainless steel for testing and research. As for promoting construction, it was unrealistic.
After the wonderful test of this stainless steel-structured catamaran speedboat, the masters also believed that Marin said the speed was three times higher. Because when the catamaran was tested, the speed of the headwind was much faster than that of traditional cross-sailing boats, several times faster. In this way, the overall speed was three times higher than that of traditional ships, which is also normal.
The only problem is that during high-speed navigation, due to the huge difference in buoyancy of the left and right hulls, the strength requirements of the beams connecting the left and right hulls are very high. Adding Shanghai water is very corrosive, and at most, it can only build a small catamaran sailing speedboat with a displacement of dozens of tons. If you want to build a large one, there are not so many stainless steel beams available.
In fact, if there is waterproof paint, it is also possible to use ordinary steel beams. However, in this era, there was no waterproof paint, so steel beams made of stainless steel can only be used as cross beams of catamarans. Therefore, the cost is very high, and the ship is not built much.
However, if several catamarans are retained, it can still be done for the dissemination of confidential information. As for the leak, 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 cannot be built. The shipbuilding masters under Marin have tested it before - wooden beams are easily broken during navigation... and metal beams must be able to prevent seawater corrosion...
In the end, only the master craftsmen under Marin could make such catamaran sailing speedboats, and they couldn't make them big.
In short, even if this technology is learned, it cannot be used. There is no way, the problem of cross-beam stress in catamaran sailboats, let alone this era, was also a big problem in shipbuilding in later generations. Therefore, although Polynesian catamarans had long been discovered, people have never been able to apply this technology to the construction of large ships. It was not until the late 20th century that the technology developed to a certain extent that pure steel catamarans began to be built. This kind of steel ship with an overall structure could avoid the problem of insufficient cross-beam strength of catamarans.
Therefore, Marin was not afraid that others would learn catamaran technology, because they would not be able to use it even if they learned it. On the contrary, the fly-shear technology and underwater fin technology, because the principle is too simple and there is no limit on the material, Marin was worried that others would learn it secretly.
But what scared Marin was that the 50-ton stainless steel catamaran sailboat he used for the test was actually attracted by Caesar, and he was clamoring to drive to London and take Sister Margaret to sea for leisure...
Marlin was so angry that he beat Caesar. Why? Because it was too dangerous!
Although catamaran sailboats with all stainless steel structures are very safe and stable, they are just as dangerous if they really encounter a big storm at sea. After all, due to material reasons, this ship can only build a displacement of dozens of tons and has limited wind and wave resistance.
Caesar is his heir. If he took Princess Margaret to the sea to die, it would have collapsed that day...
So, Marin beat Caesar without hesitation and asked him to say "a gentleman does not stand under a dangerous wall" ten thousand times in Chinese...
But Caesar is a teenager after all, and he likes catamarans that are very "cool" and very fast. It is normal to have this idea to take his female companion to the sea to surf.
Moreover, this child is very smart. Regarding Marin's concerns, he directly suggested that five stainless steel catamarans were built with a displacement of 50 tons. Five were to operate together. Even if the one he was riding in was in danger, there would always be someone else who could rescue him.
In addition, Caesar also proposed that while installing the rim inclined sail, a diesel engine propeller system is installed behind the stainless steel catamaran speedboat. In this way, when encountering a large storm, the sail can be lowered and driven by the diesel engine...
"Yoho, isn't this the design of a catamaran sailing yacht that was played by the rich and handsome men in later generations?" Marin was surprised.
In later generations, many catamaran sailing yachts played by wealthy people were equipped with diesel engines at the same time. When they were not using sails, they could still run at a speed of more than ten knots.
However, people use a Mercury engine with a single hang-up horsepower of more than 250 horsepower, and the horsepower is not comparable to the 12-horsepower single-cylinder diesel engine currently owned by Beihaiguo.
After testing, even if four 12-horsepower single-cylinder diesel engines were installed in parallel, the catamaran could only run at a speed of seven or eight knots without using sails, which was a big difference from the other person's machine running at a dozen knots. Of course, being able to run at this speed without using sails has already shocked many people.
In addition, because the catamaran sailboat has a lower side, the diesel engine is prone to get seawater when it is "jumping" at sea. Therefore, in order to prevent rust, it is necessary to use stainless steel to make the diesel engine shell, which greatly increases the cost.
"Dad, hurry up and let someone build another four catamaran yachts! I will take the catamaran yacht team to London to take Sister Margaret to sea to play!" Caesar's style of a wandering boy made Marlin stunned.
Chapter completed!