If you follow those time-traveling novels, trebuchets should be a better choice, simple to make, easy to source, and powerful. But Wei Minsheng checked it on the Internet, and this trebuchet can not be made just by the simple drawings on the Internet, even if it is manufactured, there is no skilled operator, and there is nothing to learn from these experiences in reality.

Wei Minsheng was searching aimlessly on the Internet when a pop-up ad about golf appeared on a computer screen.

Looking at the word "golf", a picture appeared in Wei Minsheng's mind: a person holding a golf club, and with the flying of the club, the golf ball was knocked out far away.

Is it possible to use this firing method?

Wei Minsheng immediately checked the batting distance of the golf, and some of them reached an average distance of more than 200 meters, and the farthest record was set by Álvaro Queiroz, who won the European Tour with a batting distance of 287 meters.

Judging from the principle of this golf shot, it is nothing more than the conversion of energy. If you set up a pendulum on a shelf and install a strong spring in front of the pendulum, you can eject the small stones under the pendulum by setting up a pendulum on a shelf.

As can be seen from the energy conversion formula, the distance the stone ejects is related to the speed, mass, and distance of the pendulum to do work on the stone. These three factors can be controlled, for example, in the case of a certain mass of the pendulum, let go of the pendulum at a certain height, and the speed of the pendulum should also be consistent. The distance at which the work is done on the stone is also easy to do, that is, the strong spring in front of the pendulum, its compression distance is also certain.

As long as these three factors are well controlled, the distance of the stones flying out of the same mass and the same elevation angle should be almost the same.

If a new type of weapon can be designed according to the principle of golf hitting mechanics, the service life of this trebuchet will be greatly extended because it will not deform other parts except for the powerful spring during use. Coupled with the simple mechanical structure, it is relatively easy to repair even if there is a breakdown.

If you make a giant pendulum weighing 1 ton and fall freely from a height of two meters, you should theoretically be able to knock a 10-pound pebble 400 meters away without air resistance.

Of course, the actual situation is more complicated, the potential energy of the pendulum cannot be completely converted into the kinetic energy of the pebble, plus the existence of air resistance, it is impossible to reach a distance of 400 meters.

But Wei Minsheng's requirements are not high, it would be good to be able to reach half, Wei Minsheng is interested in the simple control of this catapult method, the controllability of the catapult distance and the reliability of various components, these performances are much better than the performance of those trebuchets on the Internet.

What's more, there is still a lot of room for improvement in this trebuchet, if the pendulum is made into a hollow metal container, not only is it lighter to install and move, but also the weight of the pendulum can be changed by filling soil, sand and other things, so as to increase the distance of the stone.

After buying a few bearings and a few shock-absorbing springs for the van at an auto repair store, Wei Minsheng asked the carpenter Wang Wenlin to bring tools and a few villagers to the mountain beam above the square.

First, let the villagers use four cypress trees with a diameter of 20 centimeters and a length of 3 meters to make two X-shaped shelves, the intersection of the two cypress trees is a little upside, only more than 30 centimeters of trunks are left above the intersection, and a steel pipe for scaffolding is fixed at the intersection of the two shelves, and then the bottom of the two shelves is also fixed with square wood to prevent rollover.

When the villagers were making shelves, Wei Minsheng put the bearings in the middle of the steel pipes, and fixed the inner ring of the bearings with small wooden blocks to ensure that the bearings would not sway from side to side.

Then Wang Wenlin processed two cypress woods and connected them with a one-meter-long log with a diameter of 40 centimeters to form an isosceles triangle, which is the prototype of the pendulum.

The vertices of the isosceles triple solution are firmly fixed to the outer ring of the bearing, ensuring that the log can move around the bearing.

After fixing the pendulum, a round groove was dug in front of the pendulum with a tool according to the shape of the shock absorbing spring, and the spring was embedded in the wooden pendulum, which was fixed with iron nails and small wooden strips.

Wei Minsheng pushed this simple pendulum a few times, and it felt good, the movement trajectory was stable, and there was no shaking from side to side.

He also asked Wang Wenlin to process an arc-shaped wooden groove, which was just enough to allow the pendulum to pass freely.

Wei Minsheng asked the villagers to move the wooden frame, turned the direction of the pendulum movement to a direction where there was no one under the mountain beam, and after fixing the wooden trough, let the villagers find a relatively regular round pebble larger than a fist, and stood on the edge of the wooden trough with the pebbles in both hands.

Under the command of Wei Minsheng, several villagers repeatedly pushed the pendulum, and the pendulum swung higher and higher, and when the pendulum swung high to the rear under the action of inertia, Wei Minsheng put the pebbles in his hand into the wooden trough, and then quickly retreated to the side. It's an experiment, and it's not too much to be careful.

It may be that this pebble is really not heavy, but the pendulum made of this log also has some weight, only to hear the soft sound of the spring touching the pebble, the pebble flew out along the curved wooden trough.

The villagers next to them were stunned by this situation, and in an instant, such a large pebble did not know where it had flown to.

Wei Minsheng didn't see the flight trajectory of the pebble clearly, and turned his head to ask the others, and everyone shook their heads and said they hadn't seen it.

There was no way, Wei Minsheng asked the villagers to find a suitable pebble, and asked another villager to place the pebbles as he had just done, and the other villagers continued to push the pendulum.

At the moment when the pebble was placed in the wooden trough, Wei Minsheng's eyes were firmly fixed on the pebble. Following the direction of the wooden trough, Wei Minsheng finally saw the flight trajectory of this pebble clearly, because the terrain of this mountain beam was originally more than 20 meters high, this pebble flew out at 45 degrees according to the end of the wooden trough, reaching the best parabolic angle, and actually flew to the opposite side of the Lotte Creek, which was more than 300 meters.

The pebble was completely ejected by the spring, and the flight speed was raised almost instantly, no wonder the eyes followed the speed of the pendulum before, and did not see where the stone flew, it turned out that the speed was too fast, and the distance of the flight was beyond the scope of his imagination, so he did not find the landing point of the previous stone.

Wang Wenlin stared blankly at the direction where the stone flew out, and asked in a low voice: "Master, what is this thing you asked us to make?" It was easy to throw such a large stone at the foot of the mountain on the other side of the river. ”

Wei Minsheng thought about it, this pebble flew out like a cannonball, the name of this trebuchet is a bit untrue, because its principle comes from a golf ball, simply call it a golf stone cannon. So he said to Wang Wenlin: "I call this thing a golf stone cannon, it feels good, right?" ”

PS: Another brain-opening invention, good dream black technology.