Bright Sword starts with the grenade flat.

Chapter 123 Liu Qin’s leapfrog upgrade

Of course, the war between the Big and Little Bear Kingdoms before Liu Xiu's time travel has told everyone that no matter how advanced the weapons are, it is useless once the quantity and scale cannot be achieved.

Therefore, if this kind of wooden bomber wants to be lethal to the Japs, it must at least reach mass production. Not to mention that the Zero fighter with the Japs can reach the production capacity of tens of thousands, but it must also have more than a thousand vehicles. Only on a large scale can effective damage be achieved.

However, mass production of this wooden aircraft is impossible without solving two problems.

The first problem is the engine problem. Ever since Liu Xiu’s Second Battalion went out to develop independently after the Little Devils’ sweep in 1942, they haven’t actually gotten many three-wheeled motorcycles with complete engines. It seems like only six Seven cars!

There is only enough to build three or four motorcycles at most. Even if the higher-ups ordered to send all the Bianshan wheel motorcycles seized from the Eighth Route Army, there would probably not be more than a hundred motorcycles!

But when Liu Xiu looked at the two four-stroke twin-cylinder motorcycle engines on the plane, he suddenly thought that the two single-cylinder two-stroke engines used in the original Cricket aircraft, although each of those two engines only had twelve horsepower. Horsepower is only equal to the horsepower of this engine.

Moreover, two-stroke engines consume more fuel than four-stroke engines. However, they also have advantages, that is, two-stroke engines have a simple structure and a low power-to-weight ratio. That is, under the same power, two-stroke engines only weigh as much as four-stroke engines. Less than half.

As for why the weight is so low, it is naturally because its two-stroke engine structure is simpler than that of a four-stroke engine! A two-stroke engine refers to an engine that completes one working cycle in two strokes.

The first stroke: the piston completes two actions from top dead center to bottom dead center.

1. The spark plug ignites and does work - exhaust

2. Close the air intake, press the mixture into the crankcase from the lower part of the piston, and then into the cylinder from the upper part of the piston.

The second stroke: the piston goes from bottom dead center to top dead center. Complete two actions

1. Close all intake and exhaust, and compress the mixture.

2. It takes two strokes of the piston to complete a power cycle, so it is called a two-stroke.

There are three holes in the two-stroke engine block; air intake hole, exhaust hole, and ventilation hole. These three holes are closed by the piston at a certain time to achieve the effects of ventilation, air intake, and combustion.

The two-stroke engine does not have the intake and exhaust valves like the four-stroke engine, which greatly simplifies its structure and reduces its own weight.

The advantage of the two-stroke engine is that its manufacturing cost is relatively low due to its simple structure. In addition, it has the potential to pack almost twice the power into the same space, because it has double the power stroke for each rotation, which is done twice compared to the four-stroke.

But at the same time, the kinetic energy of the last work has not been fully released. Just start the next ignition, which will cause a part of the kinetic energy loss. So the thermal efficiency will not be too high. In other words, it is easy to understand. It is powerful and small in size, but it must consume more fuel than a four-stroke.

The combination of lightness and almost twice the power of a two-stroke engine gives it an amazing thrust-to-weight ratio compared to many four-stroke engines. Therefore, two-stroke engines often appear on equipment such as lawn mowers, small aircraft, small cars, and toy models that do not need to consider fuel consumption and do not require high heat conversion rates and require high power and small volume.

The low thermal efficiency of the two-stroke engine means that the next work is performed before the kinetic energy is completely released, which affects the conversion rate of part of the kinetic energy. Therefore, most two-stroke engines focus on small size, high power and high thrust-to-weight ratio. The structure of the two-stroke is destined that its heat conversion efficiency will not be too high.

Generally speaking, under the same power output, it consumes more fuel than a four-stroke engine. However, its fuel consumption is fuel consumption, but there are still advantages! That’s easy to make! Before Liu Xiu traveled through time, in addition to seeing lead-acid batteries made in rural workshops in the old Tietie Kingdom, he also saw the casings and pistons of their two-stroke engines cast in sand molds.

Of course, in the end, people still got the lathe to continue some deep processing, but the processing machine tools in the rural soil workshops of the old tieguo were actually not much better than the machine tools currently used in the Eighth Route Army's arsenal.

And the most important thing is that this arsenal has a blast furnace that can melt iron into molten iron! Therefore, it is not difficult to make a cast iron engine casing using sand mold casting method!

After all, not to mention now, more than eighty years later, engine factories still use the sand mold manufacturing method to manufacture engine casings!

Moreover, the two-stroke engine was invented in 1878. With his cheap father's understanding of mechanics, he must know the structure of the two-stroke engine, so there is no need for Liu Xiu to bother with drawings or anything like that!

Of course, even after solving the problem of engine production and manufacturing, another problem is still a headache!

And this problem is the fuel problem that gives even little devils a headache. After all, although this kind of small aircraft does not consume much fuel, it still has 40 to 50 fuel per 100 kilometers!

And once the production volume increases, the fuel consumption will also increase drastically! You can’t always rely on seizures! After all, it is really difficult to eliminate the little devils in an ambush while also being careful not to hit other people's transport vehicles!

You must know that even though Liu Xiu seized a truckload of fuel from the Japs last time, he had already consumed more than half of the seized fuel when he attacked Ping'an County.

This time Liu Xiu and Li Yunlong separated. Liu Xiu's New Third Regiment was going to open a new base in Tiyuan. Liu Xiu estimated that after bringing the tanks there, the remaining fuel would be exhausted!

When you get there, you have to continue to pay attention to the little devil's fuel, otherwise the tank will become an iron lump. As for using horses to pull the tank over there, this joke is a bit big.

Although Xiaojiizi's Type 97 tank is light, no matter how light it is, it still weighs fifteen tons! And it's also crawler-type. How many horses would it take to pull it?

Just when Liu Xiu was thinking about how to get oil, Director Zhang of the arsenal suddenly ran over with a smile on his face.

Liu Xiu saw Factory Director Zhang running towards him with a smile on his face, so he asked:

"What's going on? I'm so happy!"

When Liu Qin saw Director Zhang like this, he also put down his work and looked at Director Zhang. Director Zhang calmly said:

"Good news! Old Liu, I reported to the superiors the news that you successfully manufactured the aircraft and successfully took to the sky for a test flight. The superiors decided to immediately increase the production of aircraft, and appointed you, Old Liu, to be the head of our Eighth Route Aircraft Manufacturing Factory. The first factory director!”

Speaking of this, Director Zhang also sighed:

"As expected, gold shines wherever it goes. I worked as the director of the arsenal for several years before I got this position. In less than three months, you have reached the same level as me!"

Liu Xiu was extremely shocked when he heard the words of Director Zhang of the arsenal. You must know that the level of Director Zhang is the same as that of Li Yunlong's immediate superior!

From this, it seems that the higher-ups attach great importance to Liu Qin, his cheap father, in developing airplanes, even if they are wooden airplanes.

(End of this chapter)