After about half an hour of back and forth, the initial tank that was lying in the trench finally made the engine make a loud and thudding sound after repeated ignition attempts.

The blue smoke spewed out and the mechanical roared. As the tracks turned, the mud and sand were flew out by the rolling guide wheels. The entire vehicle body returned to its normal operation. It began to move forward slowly at a turtle speed. Although its speed was still slow, it was even more unsustainable when it was climbing the hill, which was heartbreaking. However, after experiencing the experience of breaking down just now, Oliver had already developed antibody-like immunity to it. As long as this guy can continue, even if the experiment was successful!

Seeing its overwhelming off-road speed, Qingying couldn't help but remember a turtle car that she drove in a water cabinet game in her previous life with a maximum speed of only 13Km/h. She used to complain about its outrageous maneuver in the game, and she couldn't eat the meat and the plate against the wind; however, when she truly understood what the off-road speed of this experimental tank was of 2Km/h, she immediately felt that the big turtle in the game was as fast as Cromwell and Hellcat during World War II!

Qingying retracted her gaze and no longer paid attention to the embarrassing scene on the test field that was invisible to look directly; he pressed his right hand against his chin, and his mind began to silently think about it.

There is no doubt that it is completely impossible to conduct a blitzkrieg-style tank intersect during World War I. Whether it is its single-digit highway speed or its high failure rate that breaks down at any time, it completely closes the door to a bright future. Even if there are a few years of technical accumulation, the actual efficiency of the tank it creates can only be used as infantry support, which is the limit of technological development in the current era. In supporting infantry, assault guns often play a greater role than tanks!

"Mr. Oliver, how is the offensive and defensive ability of this combat vehicle?" Qingying turned his attention to the technical research and development person next to him, saying, "The strength of this combat vehicle's strike weapon and armor protection will play a very important role in combat. I remember when it was first developed, I particularly emphasized that it should give priority to ensuring firepower strength and armor protection?"

Hearing that Qingying finally put aside the embarrassing speed and began to ask about the firepower and protection of the chariot, Oliver's spirit was revived. He smiled slightly and replied respectfully: "Report to your highness, I have never forgotten your instructions. In fact, the reason why this chariot is only equipped with a 35-horsepower engine is because I always practice your will and make choices about it among the three elements."

"In terms of firepower, it is equipped with a 37mm short-barrel rapid-fire gun improved by naval machine guns, firing 0.8kg of shells and 60 rounds of ammunition, which can effectively eliminate ordinary sand and gravel bunkers, machine gun positions and earth-built towers. The four-way rotating turret and quite good pitching effectively guarantee the artillery's firing boundary and can also perform normal firepower output under various complex and undulating terrain." Oliver pointed to the short cannon that extended from the circular turret not far away, and then said, "In addition, in order to ensure the shooting accuracy, I also installed a set of simple aiming equipment for artillery inside, so that the artillery can also have considerable accuracy for targets hundreds of meters away."

"In terms of protection, I also tried to do it to the best: the body and turret front are both 15mm thick and tilted armor at an angle of 30 degrees to the horizontal line, while the side and rear are 8mm vertical protection. According to the tests we conducted on the test site, the 60-degree tilted 15mm armor is not only completely immune to our heavy machine gun firepower at a distance of 0, but even the 37mm cannon shells have a high chance of bounced out! Although it is on the larger caliber artillery surface, it is very likely that the shells of the 37mm cannon can bounce off!

It was still hard to escape before, but this was still an extremely exciting result!" At this point, Oliver's words were filled with an uncontrollable excitement; he turned his head and said to Qingying in a tone of contempt and admiration, "Your Highness. The tilted armor defense mode you proposed has amazing defense for direct-fired shells; during the test, this tilted armor bounced off more than half of the 37mm shells shot from 100 meters away!"

Hearing Oliver's tone full of amazement, Qingying couldn't help but show a hint of pride. As a BB party member who had been diving in forums for a long time in his previous life, he had a deeper understanding of tilted armor.

In later generations, as long as ordinary enthusiasts who have a little bit of military and physics, they will know that when facing direct shells, the inclined armor will have better protection than the vertical armor of the same thickness. However, few people can reach a relatively correct conclusion on how many times the thickness of the inclined armor can be equivalent to its own thickness.

In view of simplicity and justice, SerB, a famous white-haired science fiction writer, adopted the simplest and rough algorithm in the tank game he developed: cosine equivalent. Through a simple junior high school mathematical model, the file master pieced together the thickness and inclination angle in a rigid way, forming a set of "science fiction laws of physics" that belonged to him. However, in fact, the protective enhancement effect brought by inclination armor is not something that can be concluded by a simple triangular cosine; in addition to angles, small thicknesses such as inclination armor are also closely related to the caliber of the incoming shells.

According to the tilt effect chart drawn by the Americans, when facing a 37mm shell, the 15mm thick 60-degree tilt armor has an equivalent thickness increase of about 2.4 times; this means that the front of the body of the chariot is 36mm thick, which is obviously a great improvement from the data calculated by the simple triangular cosine. Therefore, the immature armor-piercing bomb currently has a high chance of being bounced away, which is what Qingying expected!

"I got inspiration on naval warships about the idea of ​​tilting armor. It was only because the ballistic throwing in naval battles was difficult to balance the protection height, so I gave up this idea." Qingying smiled and said an excuse he had prepared long ago. He paused, and then said: "Although the defense performance of this kind of chariot is good, it can only barely defend against 37mm shells; once the opponent's larger caliber artillery is faced with a larger caliber, its protection is still difficult to guarantee. In addition, the power of the 37mm cannon it is equipped is also a bit low, and it is necessary for us to increase its caliber."

Oliver looked embarrassed and said, "Your Highness, this is the limit I can do at present. If the firepower and armor are further improved, the tonnage of the tank will be further increased; in this way, both load-bearing systems and mechanical stability will face a more severe test than the moment, and mobility and reliability will not be guaranteed. Although I will follow your will to work hard to develop, the final result is likely to be difficult to meet your requirements. You have also seen that even this guy with only 9 tons has the reliability still to be improved."

"If the turret is abandoned, it should be able to improve its firepower and defense performance without the combat tonnage being basically unchanged, right?" After laying the groundwork, Qingying finally came up with his thoughts about assault guns.

"Give up the turret? How should this kind of tank be designed?" Oliver couldn't turn around for a moment.

"Give up the turret structure, fix the artillery to the front of the vehicle body, and maintain its rotation ability in a small range on the left and right ranges, which can save a large part of the weight. In addition, the engine can also be replaced from the current gasoline type to a diesel engine with greater power per unit weight. At present, all the latest submarines of the Navy have begun to use this new type of machinery. In this way, the cost of improving firepower and enhancing protection is saved." Qingying simply pointed out the biggest feature of the assault gun, and then said, "After using these two methods, we can try to equip the 50mm artillery for the vehicle body and increase the armor thickness on the front of the vehicle body to 35mm; and once this kind of combat vehicle appears on the battlefield, it will definitely greatly help the infantry's advancement!"

After listening to Qingying's description, Oliver couldn't help but lit up suddenly. Due to its independence and rotational characteristics on the vehicle body, the turret needs to be supported by a complex internal mechanism; and if it is only placed inside the vehicle body like the contour of a warship, both weight and space will be effectively saved. Although this also has obvious disadvantages: for targets beyond the shooting angle of the artillery itself, the vehicle body needs to rotate to aim, which is undoubtedly a big test for the original combat vehicle that is often stuck; but compared with the improvements in its firepower and protection, this price is completely worth trying!

"In addition, we should also equip each tank with a machine gun to make up for their firepower gap under a single cannon and avoid being easily approached by enemy infantry." Qingying thought for a while, and then said. In history, the Ferdinand chariots in World War II in Germany were blown up by the opponent's infantry in close combat in the early stage because they did not have machine guns, and suffered huge abnormal losses. As a time traveler, he naturally wanted to avoid this possible battlefield risk.

Oliver pondered for a moment, then respectfully claimed that it was. Adding a machine gun is not a difficult task for a chariot. He only needs to make a little change to it to meet the crown prince's strange demand for this strange weapon.

While commuting, the engine sound that was humming not far away gradually subsided; Qingying turned around and looked, the off-road test was over unknowingly.

PS: Thank you book friend Mingjian, Tianxia Langqing, Long Fengpo and Brother Xu's monthly ticket support and book friend, why am I so bad for my reward~~~ Although the author was on a business trip to the construction site, he still worked hard to write~
Chapter completed!