Release that Witch

Four days later, the caravans of the caravans sailed off the dock.

Tassa and the 100 First Army soldiers accompanied the ship and set off for Wangdu.

During these days, Roland and Margaret reached an agreement that Tassa could withdraw any amount of Golden Dragon at her store. This fee will be deducted from the steam engine sales amount. In addition, Roland needs to pay an additional fee. One interest.

This time, the saltpeter and the ingots brought by the other party were almost twice that of the last time. However, with the deposit of the two riverboats, Roland still got more than 2,200 gold dragons, which was almost in the month of the demon. It’s a figure that you can’t imagine, even if you sell a month of ore, but only 300 gold dragons.

After the caravan left, Mai Hao also arrived at the time of leaving the border town.

In accordance with the agreement with the ashes, she will travel to the fjord islands to bring news about the West.

Roland specially wrote a long letter to her, in addition to expressing the attitude of mutual assistance and cooperation, I also hope that the five kings can send some auxiliary witches to help themselves. In the letter, he did not live as a brother, but negotiated the matter with the lord of Bianbu Town and the status of the West. Although the possibility of the other party's promise to himself is very small, he still has to try it out. It takes a lot of effort to write a few words anyway.

The place to be sent is in the backyard of the castle, and all the witches are here.

The nightingale gave her a small bag of dried fish; the lightning sent a packet of pepper.

The other witches looked up and touched her feathers, and hugged her to say goodbye to the battle.

“Reassured!” she raised her head. “I will be back soon, hehe!”

"What if I don't want you to come back," said the lightning.

"Oh..." The pigeons narrowed their necks and thought for a while, shaking their tail feathers. "Then I will fly back and squat!"

"Then we said it," the little girl seriously promised. "If you come back, I will personally grab a bunch of birds to bake for you. And the hive we found last time, keep waiting for you." Take it off together."

"Hey!" She nodded again and again. "Say it!"

Can you say that you are good? Roland was filled with emotions on the side. It was only a month that he had completely turned the wheat to his side. Well done, lightning!

"Then, everyone will see you again!" Mai Hao began to grow strong wings, and after running for a while on the ground, he slowly flew up. After two rounds, he gradually disappeared into the southeast.

"She can arrive smoothly." Roland looked at the slow movement and couldn't help but squeeze her sweat.

"No problem," Lightning did not hesitate, then squatted. "Should...?"

After sending away the wheat, Roland soon plunged into the busy daily work.

This time, he will draw a complete set of designs for the two vessels to be rebuilt by the Crescent Moon Caravan, and they will also become the world's first steam-powered paddle steamers.

Thanks to a single power source, the steam engine's power shaft can be directly connected to the paddle wheel without the need for a gearbox. The air intake is controlled by a plurality of intake ducts to control the speed of the ship. To slow down or stop the boat, simply turn off the intake manifold and allow excess steam to escape from the exhaust. At this time, the fire still keeps burning, and it is convenient to speed up again.

The principle is not difficult, and Roland quickly drew a rough model. In order to get accurate production drawings, you have to go to the site to measure the specific size.

At this time, Anna walked into the office with a book.

"What's wrong?" He put down the quill, and couldn't help but smile.

"This book is finished," she put the book on the desk, which is the "Theory of Natural Science Theory."

Roland’s smile suddenly stuck on his face. It’s too exaggerated. After only a few months, I’ve finished reading all the high school math and physics knowledge. He didn't ask the other person if he understood it, because Anna's reading means full understanding, otherwise she will definitely look over it again, or ask herself.

“Do you draw these drawings, do you want to use a steam engine instead of a sail to power the boat?” Anna’s attention was quickly drawn to the sketches on the table, “but...”

"What is it?"

“These two wheels are similar to paddling? When you turn, you can generate thrust, but half of it is exposed, which is equivalent to wasting some power. Why not bury it all in the water?”

"..." Roland groaned, not knowing what to say. The person who knows it can't exist. That is to say, she made the above judgment based on the impression of this moment alone? He suddenly raised his interest. "What do you say should be better?"

Anna thought for a moment, raised the pen and started drawing on paper.

Roland supported her chin and listened with great interest to the bangs that slipped from the hairpin when she was seriously drawing. She swayed back and forth with her movements. The slender eyelashes twitched from time to time, and the white cheeks revealed natural rosy. Although this angle can only see the side face, the silhouette from the bridge of the nose to the chin and then the neck to the neck forms a perfect and soft curve.

"Would you like to eat fish fillets?" The nightingale came over and put his hand between the two.

"Well," Anna nodded, covering the snacks that the latter handed over. "Thank you."

Roland, who was obstructed by his eyes, coughed twice and had to look back to the paintings on the table.

At first, Anna tried to completely bury the paddle wheel in the water, but this would make it difficult for the ship to observe the position of the wheel when it was docked, and it would easily hit it on the dock or the bridge.

Then she placed the paddle wheel at the stern. This is also a common practice, but the drive setting is much more complicated. After all, the bulky steam engine is not suitable for the end of the hull, so the drive shaft and gearbox will occupy a considerable part of the hull. .

When Roland saw the new drawings she had drawn, she couldn't help but marvel at her sharp thinking ability.

The sketch that Anna is pondering is infinitely close to the arrangement of a single-axis propeller. The steam engine is placed at the bottom of the hull. The drive shaft extends out of the hull below the waterline and ends with four square blades that look a bit like a windmill.

"I don't know if I can do this," she hesitated. "It is reasonable to say that as long as the paddle is kept at an angle of inclination, a horizontal component can be generated, but I have reduced one of the paddles. It is impossible to push by four paddles. The hull."

"Of course, just a little modification." Roland took the quill in Anna's hand and drew the original look of the propeller. "This shape of the blade is more suitable for rotation in the water than the windmill. Your mind is completely Correct, but the contractual requirements are to be transformed into a paddle steamer, so we still do the first method to do this is not related to technology, but a business strategy." He paused, "I am going to test the hull data, Are you coming with me?"

Anna licked the blue eyes, "Well!"

After mastering the theory, verifying it in practice is the best way to learn.

......

"nightingale?"

When Anna followed the prince to the door, she saw that the nightingale was still looking at the drawings on the table and couldn’t help but open the door.

"Ah, let's go first, I will come right away."

After repeatedly comparing the sketches in her hand, she came to the conclusion: Isn't the place where the wheels are placed changed to a position? (To be continued.)