The next day, he crossed the wasteland in the northwestern part of the territory.

Van Sailing stood tremblingly holding a swarthy arrow cylinder cannonball, the simple gun carriage was set up by the soldiers, saying that it was a gun carriage, but in fact it was a round iron cylinder with a diameter of about 30 centimeters, and Rand installed pulleys and support rods on the top of the iron barrel to adjust the angle at which the cannonball was fired.

The rocket projectile is different from the earth cannon that fires a solid projectile, and the kinetic energy of the earth cannon is mainly worked inside the gun barrel, just like the enlarged version of the flintlock pistol, which is generated by the expansion of gunpowder to produce power to work in the gun barrel and then push the solid iron projectile at the front exit, this kind of earth cannon has extremely high requirements for the material of the gun barrel, and the thickness of the gun barrel also needs to be reinforced, so that the cost will be increased and the extremely heavy dead weight.

The power of the rocket and the bomb mainly comes from itself, which is powered by the fuel in the propulsion chamber, and the fuel is ignited and then sprayed out through the exhaust pipe in the rear to realize the reaction force to push the shell forward, and the distance of the range can be adjusted by the amount of fuel.

Moreover, the deterrent effect and killing area brought by the use of shrapnel to kill the enemy by the flame explosion are not comparable to the earth cannon that fires solid projectiles.

Speaking of earth cannons, Rand thought of a kind of earthen cannon based, but after the improvement of the field artillery, this kind of cannon called the Franc cannon is divided into two parts, the mother barrel and the sub-barrel, generally a Franc cannon should be equipped with more than seven sub-cannons, in the rear of the mother barrel is provided with a cylinder wall that can be opened and closed at will, before the cannon is opened, the * The projectile is added to the sub-cannon, and then the sub-cannon is loaded into the mother barrel, and the sub-cannon is ignited for firing, after an attack, the fired sub-cannon is quickly taken out, and then the other sub-cannons that have been loaded are replaced, how to circulate, greatly increasing the rate of fire of the cannonball.

However, Rand remembered that although the rate of fire of this kind of Furlong cannon was extremely fast, due to technical shortcomings, it was difficult to achieve the ideal firing range, because the gap tolerance between the sub-cannon and the mother barrel was relatively large, so when the gunpowder exploded, the gas would leak out with these gaps, resulting in insufficient power, and the firing range could not reach the distance of ordinary earth cannons.

However, the advantages of the Franc cannon are also obvious, the rate of fire is fast, it can complete three bombardments in 20 seconds, compared to the bulkiness of the earthen cannon, the speed of the Franc cannon is more than five times higher.

Moreover, the fault tolerance rate of the Franc cannon is much higher than that of the earth cannon, even if there is an explosion accident, there is a sub-cannon as the first force object, the mother barrel will not be paralyzed, and the Franc machine equipped with seven sub-cannons does not have to worry about the impact of damage to one sub-cannon.

But so far, the cost and time of making the Franc cannon are far more than the simple system of rocket cannons, Rand thought about it, if he wants to make the Franc cannon, then he will have to wait until the beginning of spring next year, he needs to recruit craftsmen from all over the country, the production process of the Franc cannon is much more elaborate than the incendiary shells, and Rand does not think that the craftsmen in his own territory can complete the manufacturing operation.

Although the craftsmen of the Kongdu Collar are working hard to learn more advanced knowledge and make their skills more and more sophisticated, it will still be a long time before they reach the requirements of the Rand.

"My lord, the angle has been adjusted. Versailles twisted the gears on the gun carriage to adjust it to the right height, and in front of the barrel was a bunker-like pile of weeds and wood.

Rand visually measured the distance from the gun mount to the building that served as the target, which was about three hundred and fifty paces, which should be three hundred meters when converted into a specific number.

The theoretical range of the rocket artillery should be more than 500 meters, but due to the light size and the burning state of the particles that act as gunpowder, it may deviate the flight trajectory, so Rand felt that this distance is the most suitable, after all, on the battlefield, the distance of 300 meters is enough to make the opposing cavalry gallop at full strength for more than ten seconds, and the infantry takes longer, and the rocket artillery only needs two seconds to reach this distance, and produces a strong explosion to break up the opponent's formation.

Rockets, bombs to explode air waves and broken shrapnel to kill and injure the enemy, Rand has done a lot of time, the explosion range of the warhead is about three meters, but the area covered by the shrapnel has reached more than ten meters, and contains a strong penetrating force, Rand witnessed the explosion, shrapnel whistling into the scene of the rock, if it is replaced by a human body, I am afraid that after the whole is penetrated, the shrapnel still has the strength to kill the next target.

"Okay, let's get ready to launch. Rand gave the glorious task of firing the first rocket cannon to Versailles, while he himself hid behind the shield wall held by the two knights, poked his head out, waved his hand, and said, "Light the fire!"

Versailles took a deep breath and carefully lowered the heavy iron guy in his hand along the barrel, leaving only the lead outside.

In order to prevent accidents, Rand deliberately set the lead long enough to have time to evacuate after ignition, and although he is confident in his research results, it never hurts to be careful.

Everyone retreated ten meters away, and the torch that Verssailles lit approached the lead, only to see the fire flickering, and the acrid smoke rising, and Verssailles turned around and hid behind the mound of earth that had been set up in advance.

He had seen the incendiary bombs explode with his own eyes, and as rockets that were also powered and killed by gunpowder, he felt even more awe.

The imaginary roar did not appear......

All they saw was a black light dragging a long tail of flame into the air, and the high-pressure air currents from the back blew the nearby snow into the sky, creating a hollow area on the ground.

The flight stability of the rocket artillery does not depend on the rifling of the barrel to maintain, and there is no need to make rifling for this simple barrel, it mainly relies on the tail of the tail to control the direction and stability.

However, the distressing thing is that Rand has not been able to determine the accurate data of the tail fin manufacturing, so he has to build several tail fins with different thicknesses according to the volume of the rocket launcher for testing, in order to confirm which one is more suitable for assembly.

Everyone's eyes looked at the rockets that had left a brilliant trail in the sky, and their eyes changed from looking up to looking up.

After the rocket flew out, it directly deviated from its original trajectory, and it was supposed to bombard the target in a straight line, and it flew up to an altitude of more than 400 meters like a drunken man, and after the gunpowder in the fuel chamber was burned out, it began to fall weakly.

Then there was a loud bang.

The sky seemed to be lit up with a very grand fireworks.

The two knights hurriedly put Rand under their shields.

Shrapnel rained down on the shield with a crisp clanging sound.

"It seems that the first test launch of the rocket bomb ended in failure. ”