It rains in July. Leonardo opened the door and took a deep breath.

He hadn't come out of his invention house for several months—one of Lorenzo's estates, two stories high and six or seven rooms. If it weren't for the servants of the Medici's family who delivered food, water, clothes and cleaned the room on time. Maybe Leonardo will die in it. But he succeeded after all, after he devoted himself to a field for a long time.

The finished product behind him is the treasure he once told Lorenzo: a paper for a high-speed engine. V-twin gasoline engine.

It is a small, compact gasoline engine that works on a four-stroke cycle. This engine has two cylinders at an angle of fifteen degrees, inclined to each other, and the two connecting rods of the two cylinders are connected to a common crank. Of course, if the traditional carburetion mode is still used, it is faster and limited than a simple fuel engine.

Therefore, Leonardo specifically invented a float-filled carburetor. The efficiency of this new carburetor immediately increased the efficiency of the gasoline engine several times, so that it could even be used as the power of a car. up.

Of course, for the situation where steam locomotives are well developed today. Going straight to building cars that run on new fuels is not a very smart move in an attempt to capture the market. Moreover, the structure of the car is also much more complicated, and these two inventions alone are not enough to make a mature car. Leonardo intends to make full use of its biggest advantages—lightness and high speed, and use it to manufacture the world's first motorcycle and motorboat. It wouldn't be too difficult, at least for him. Perhaps by the end of the year, he will be able to produce a prototype of the motorcycle. Maybe even if it took Lorenzo for a drive.

These two inventions are almost the inventions that took Leonardo the most time.

He was not familiar with this aspect at first, and his knowledge in this aspect has far exceeded the understanding of an ordinary fan. In fact, it took Leonardo five months to fully understand the existing knowledge of this industry from old Frederick, and by the way, Cui destroyed old Frederick's self-esteem and self-confidence. Only by relying entirely on Ruo's own predictive vision can he fumble to get these two things out.

And this is already his second or third year back in Sardinia.

In the third month after he returned to Sardinia, that is, on March 21, 1464 in the new calendar, the Teutonic Kingdom declared war on the Principality of Sardinia.

At the end of April of the same year. The Teutonic Kingdom declares war on the Frankish Republic. It is now 1465, the second year after the war began.

Although the Three Kingdoms War surrounding the Mediterranean Sea has not yet completely ended, the situation has become much more stable. In February 1964, with the help of the old Teutonic craftsman Frederick, Leonardo successfully made a Brayton-type twin-cylinder engine. It is a two-cylinder, two-stroke cycle low-speed fuel engine, which is economical, portable, and easy to obtain raw materials. It was soon used for weeding, automatic water pumping, and grain harvesting. Although the patent income was far less than that of the automatic Jacquard machine, it could also allow Sardinia to build a new welfare home. And the anti-aircraft gun designed by Leonardo before, achieved great results soon after the war started, and the Teutons really used hard airships. This huge airship, which uses cow intestines as its main raw material and is supported by a metal skeleton inside, can rise to a very high level. At least it was far higher than ordinary airships and farther out of the effective shooting range of rifles and cannons.

They are high above, and can continuously drop bombs and incendiary bombs downward, and the opponent has no power to fight back.

Half a month after the start of the war, the Teutons tried to send out four new airships, and began to bomb the main traffic arteries on the northern border of Sardinia, and achieved considerable results. The road was lightly cut off by the airship troops, and the large piles of food that were continuously transported from the north to the south could not be transported out; No resistance.

So they immediately had Rome, the city where Xinqi was located. Then turned around and directly bombed Cagliari, the capital of the Principality of Sardinia. Send 8 troops to land in Sardinia, achieve victory in the shortest time, and conquer the Principality of Sardinia. the whole process. They intend to control it within three months.

At this time, the Frankish Republic took the opportunity to ask the Teutons for a commission that was not too much: it was said to be a commission, but it was actually a protection fee. They are not adjacent to Sardinia, and the Teutons can't believe that their organized army will enter the Teuton, which will undoubtedly bring huge chaos to Teuton. Therefore, even if the Teutons paid this "commission", the Frankish army would basically not make a move.

In fact, the reason why they took the opportunity to ask Teutonic for a "commission" was to say straightforwardly, "If you don't give us money, we will have to sneak up on you from behind after you start the war." This is undoubtedly extortion . After all, the soldiers of Sardinia are not adjacent to them, but they are all adjacent to Teutonic at the same time. This is the perfect condition for the establishment of a natural ally. Importing countries, but Frank's export capabilities are much worse. Their blackmail this time can be said to have been expected by the Teutons. But the Teutonic reaction was fierce! , but it was unexpected by the Franks—they directly took the opportunity to declare war on Frank. Six airships took off from Zurich, flew directly to Verdun and cooperated with the army to occupy it within a week. Before the Franks could organize an effective counterattack, they quickly advanced from east to west. The Sardinian army has also advanced to the Tuscany region within a week. Although if the airship goes by itself, Rome may have been bombed at this time. After all, it is impossible for them to jump directly from the airship to occupy the city. Although they can hover high enough and hover for a long time, the personnel on the airship still have to come down to resupply. After all, the airship looks big, but the available space is actually not that big. Ammunition, fuel tanks, food and water are limited. But on the same day when the airship cooperated with the Ruo army to enter the defense line of the Tuscany region, they suddenly suffered heavy losses.

The Sardinians did not know where they found a very long cannon, and easily shot down three airships overnight.

If the last airship hadn't seen the situation going badly and turned around and ran away when the Sardinians unhurriedly launched those weird long cannons, the Teutonic "ace weapon" might be destroyed overnight. All gone.