In fact, the tactic proposed by Lu Feng to attack and destroy the stern rudder of the enemy ship in advance was an upgraded version of Zheng Zhilong's "Battle of Liaoluo Bay" against the Dutch. In the "Battle of Liaoluo Bay", because Liu Xiang's fleet carried the main attack, and Zheng Zhilong was not familiar with Western ships, he did not send anyone to do anything, resulting in the loss of 3 of the 8 warships of the Dutch, and the remaining 5 were wounded and fled.

And this upgraded version of the fire attack method that Marlin has engaged in also comes with the means to let the water ghost destroy the enemy's tail rudder. In this way, when the Portuguese found out that the fireship was coming, even if they boarded the ship in time to raise the sails and escape, they would not be able to turn and run away in time because the rudder failed. As long as you get stuck to the fireboat, there is absolutely no good end.

In addition, in the plan formulated by Marin, there is also a tactic of letting the water ghost carry the "fire oil bottle". The so-called "fire oil bottle" is actually to put fire oil in an ordinary porcelain bottle and carry it by the water ghost. When the fireship rushes nearby, the water ghost throws the fire oil bottle onto the deck of the enemy ship. The porcelain vase was brittle and smashed onto the deck, filling the deck with fire oil. At this time, the fireship can easily set the deck on fire when it comes up again. As for the water ghosts, there is nothing wrong with that. They are water-oriented and can easily avoid the range of fireboats. Even if there is a fire on the body and a stuffy person dives into the water, the fire can be extinguished.

After Lu Feng introduced the "fire oil bottles", he asked the servants who accompanied him to take out dozens of "fire oil bottles"—these were a mixture of gasoline and kerosene extracted from the oil produced in the Miaoli pit oil well, which was very flammable.

Although the current production of the sulfur pit oil well is very low, the daily output is only a few dozen catties. However, it is still no problem to use it to refine dozens of bottles of "fire oil".

In fact, the Ming Dynasty also had fierce fire oil, which was also refined from oil. Oil was recorded in the Song Dynasty, and its application in ancient China was relatively early.

However, the use of oil in ancient China was relatively primitive, that is, it directly used oil as a weapon of arson, and its burning intensity was far less than that of the mixture of refined gasoline and kerosene. After all, oil is adulterated with too much diesel and lubricant that is difficult to ignite over an open flame. The mixture of gasoline and kerosene extracted by Marlin in the distillation kettle is very easy to burn, and it burns very quickly and is difficult to extinguish.

This was the result of Marin's suppression, and he had the craftsmen deliberately raise the distillation temperature, and the resulting gasoline was mixed with a large amount of kerosene with a high ignition point. If it's all gasoline, it's even more terrifying and dangerous to burn.

In order to prove the power of this "fire oil", Lu Feng specially asked people to find damp firewood and spread it on the ground. Then he took out a porcelain bottle filled with fire oil and smashed it on it, allowing the oil to soak the wet wood.

Then, Lu Feng asked for a torch and threw it on it. Then, the "oil of fire" burned violently, and the fire was extremely fierce. Then, the wet wood beneath the oil was also burned by the raging fire, and there were bursts of white gas—it was evaporated water vapor. When the water vapor was dried, the wet wood dried, and then it burned in a fierce fire, and with a short effort, it burned to ashes......

"This ...... Sure enough, violent! Lu Sheng, do you still have this kind of fierce fire oil in your hand? This official wants a lot! Wang Hong said excitedly.

He has also seen the world, and he has seen ordinary fire oil. However, although ordinary fire oil is also flammable, it is not so fierce. This mixture of gasoline and kerosene burns with a sudden burst of flames, unlike ordinary burning, where the flames slowly rise. This kind of burning is best used to set fire to ships.

Lu Feng shook his head and said:

"This is when the students traveled to Dongfan Island, the chief steward of Dongfan Island Kong Tai (Kong Tai was called the governor in the Beihai Kingdom, but here in the Ming Dynasty, he could not be called the governor, but only called the chief steward, instead of Ma Lin, who could not be permanently stationed in Dongfan Bo to deal with affairs) sent dozens of bottles. It is said that this fierce fire oil was extracted from petroleum by Western alchemists. He doesn't have much oil in his hands, otherwise he can produce more ......"

Wang Hong's eyes suddenly lit up and he asked:

"This thing is made from petroleum? What is the output rate? "Wang Feng knows about the oil, and he has also read Shen Kuo's "Mengxi Writings", and knows that this thing is produced in northern Shaanxi, which is widely used as oil by the Ming army. However, the power of this fierce fire oil in front of him exceeded his imagination, and it was the most suitable weapon for fire attack. If the energy is produced, it will definitely make the combat power of the Daming Sailor soar!

Lu Feng followed Kong Tai's instructions and said "honestly":

"I heard Chief Steward Kong say that this kind of fierce fire oil can only be refined by a generous man in their Beihai country, and the yield is very low, and 1 kg of fierce fire oil can only produce less than 1 tael." The one tael here is not one tael of 1 catty and 10 taels, but one tael of one catty and sixteen taels, that is, about 37.3 grams, which is one-sixteenth of a catty.

But in fact, even if the refining method is backward, there is no means of cracking hydrogenation, and the total proportion of gasoline and kerosene extracted from ordinary distillation kettles has reached about 2 percent, that is, 20 percent.

But Kong Tai deliberately reported one-sixteenth of Wang Hong, that is, 6.25 percent, because of an order from Ma Lin - he wanted to deceive Daming's oil resources......

As a history student, Ma Lin remembers that although the Ming Dynasty did not drill the first oil well in Jiazhou, Sichuan until 1521, and it was quickly buried, oil was collected long before ancient China.

Of course, those oils are all oil seedlings that emerge from the surface on their own, and the production is not much, and the ancients did not drill wells to extract oil. The oil well in Jiazhou, Sichuan and Shu was accidentally opened by people when they opened a salt well using the drilling method of Zhuo tube well. However, because the local people did not know enough about oil, it was not the salt brine well they needed, so this artificially dug deep oil well was filled, which is a pity. The oil in northern Shaanxi and other places is the oil from the hand-dug shallow wells several meters deep by the locals, and the output of one well is about the same as that of the sulfur pit, and the daily output is only dozens of catties.

But the Ming Dynasty was so big, not one or two earthen oil wells. One bite here, one bite there, the total annual output is tens of thousands of catties. However, these tens of thousands of catties of oil were simply and rudely used directly as fire oil for fire attack, and there was no further processing.

Ma Lin's meaning is to take the opportunity to help the Ming Dynasty process more powerful gasoline and kerosene mixed oil, and cheat more oil from the Ming Dynasty. At that time, even if he sent back 6.25 percent of the mixed oil to Daming, he would still have more than 13 percent of the gasoline and kerosene left. What's more, more than 20 percent of diesel fuel can be obtained to fuel the diesel engines of the North Sea Kingdom. The oil left over from refining gasoline, kerosene and diesel can also be used to refine mineral lubricants.

The mixture of gasoline and kerosene has super firepower, and the Ming Dynasty will definitely find a way to expand production after realizing the power of this "fierce fire oil". When the time comes, send more oil to Marin, even if the gasoline and kerosene are sent back to Daming, just the diesel fuel saved can make Marin earn more.