Release that Witch Chapter 213: Stream Ship solution

Four days later, the caravan sailed and sailed away from dock.

Tasa, along with hundreds of First Army soldiers, set off for Kingdom Capital.

In for several days, Roland and Margery have reached an agreement. Tasa can withdraw any amount of gold royal in her shop. This cost will be deducted from the sales amount of steam engine. In addition, Roland will need to pay an additional 1% Interest.

This time, the saltpeter and ore ingot brought by the other party are almost double the previous time, but with the deposit of two river trade ship renovations, Roland still received more than 2,200 gold royal entries, which was almost at Months of Demons. It is an unthinkable figure. Even if the ore was sold for a month, it would be only 300 gold royal.

After the caravan left, Macy also arrived at Border Town's.

According to the agreement with Ash, she will go to the fjord islands and take the news about Western Region's.

Roland wrote a long letter to her, in addition to expressing her attitude of mutual assistance and cooperation, she also hoped that Fifth Princess could send some auxiliary witch to assist herself. In the letter, he did not pretend to be his elder brother, but discussed the matter as Border Town feudal lord, under the leadership of Western Region. Although the possibility that the other party promised himself was very small, he still had to try to write a few more words anyway.

Farewell to the castle backyard, all witch have arrived.

Nightingale gave her a small bag of dried fish tablets; Lightning sent a bag of pepper.

The other witchs came forward, stroking her feathers with a look of resentment, and she hugged and bid farewell to the battle, just like farewell.

"Relax!" she raised her head. "I'll be back soon, go!"

"What if Tilly doesn't let you come back," Lightning said worriedly.

"Goo ..." The pigeon narrowed its neck for a moment, thinking about shaking its tail feathers, "Then I'll fly back secretly!"

"Let's say that," the little girl promised earnestly. "If you come back, I'll catch a bunch of birds to cook for you. And the hive we found last time, waiting for you Come and take it out together. "

"Guo!" she nodded again and again, "Come on!"

What else can you say? Roland was full of emotions. In just one month, Macy was completely turned to its own side. Good job, Lightning!

"So, goodbye everyone!" Macy spread its strong wings, slowly flying up after a run-up on the ground, and disappeared to the southeast after circled twice.

"She can arrive smoothly." Roland watched this slow movement, could not help but sweat for her.

"No problem," Lightning said without hesitation, then tilted her head, "should ...?"

The Macy was sent away, and the Roland was quickly put back into his busy daily work.

This time, he will draw a complete set of design drawings for the two ships to be modified left by Crescent Moon Bay Caravan, and they will also become the first steam-powered Stream Ship in the world.

Since a single power source is used, the steam engine power shaft can be directly connected to the paddle wheels without a gearbox. A plurality of intake ducts are used to control the amount of intake air, thereby controlling the speed of the ship. When you want to slow down or stop the ship, just close the intake pipe and let the excess steam escape from the exhaust port. At this time, the furnace fire is still burning, and it is convenient to want to increase the speed again.

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

At this time, Anna entered the office with a book.

"What's wrong?" He put down his quill and couldn't help smiling.

"This book is finished," she put the book on her desk, exactly the «Theoretical Foundations of Natural Science».

Roland's smile suddenly froze on the face, which is too exaggerated, did you finish all the high school level mathematics and physics knowledge in just a few months? He didn't ask the other party if he understood, because after reading Anna, he understood completely, otherwise she would definitely read it again or ask herself.

"Did you draw these drawings to replace the sail with steam engine to power the ship?" Anna's attention was quickly attracted by the sketches on the table, "but ..."

"But what?"

"These two wheels are similar to paddles? You can generate thrust when you turn them, but half of them are exposed, which is equivalent to wasting some power. Why not bury them all in the water?"

"..." Roland froze, wondering what to say. A born person impossible exists, that is to say, she made the above judgment based on the momentary impression alone? He suddenly became interested. "Then what would you say is better?"

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

Roland supported her chin, enjoying with great interest the bangs she slipped from the hair clip when she was drawing seriously, and she moved back and forth with her movements. The slender eyelashes bounced from time to time. The white cheeks revealed nature. Ruddy. Although you can only see the side face at this angle, under the light, the contour from the bridge of the nose to the chin and then to the neck forms a perfect and soft curve.

"Do you want fish fillets?" Nightingale came over and put his hands between the two.

"Yeah," Anna nodded, holding the snacks handed over by the latter, "Thank you."

The Roland with coughing eyes coughed twice and had to look back at the paintings on the desktop.

In the beginning, Anna tried to completely immerse the paddle wheel in the water, but this will make it difficult to observe the position of the runner when it is docked, and it will easily cause it to hit the dock or the trestle.

Then she arranged the paddle wheel to the stern. This is also a common practice, but the transmission settings are much more complicated. After all, the bulky steam engine is not suitable for placing at the end of the hull. In this way, the drive shaft and gear box will occupy the hull. Great location.

When Roland saw the new drawing she made, she couldn't help but marvel at her sharp thinking ability again.

The sketch that Anna is considering is infinitely close to the arrangement of a single-axis propeller. steam engine is set at the bottom of the hull. The drive shaft extends from below the waterline. The end is connected with four square blades, which looks a bit like a windmill. .

"I don't know if I can do this," she hesitated. "Theoretically, if you keep the paddle at an inclination angle, you can produce a horizontal component, but I reduced a paddle wheel and rely on four paddles alone. May not be able to push the hull. "

"Of course you can, just need to modify it slightly." Roland took the quill in the hands of Anna and drew the original appearance of the propeller. "Compared to the windmill shape, this shape of the blade is more suitable for rotating in water. You The idea is completely correct, but the contractual requirement is to transform to Stream Ship, so we still do it in the first way. It has nothing to do with technology, but a business strategy. "He paused," I want to measure the hull data now, Are you coming with me? "

Anna blinked those blue eyes, "Yeah!"

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

...

"Nightingale?"

When Anna followed the prince to the door, seeing that Nightingale was still looking at those drawings on the desktop, he couldn't help but say.

"Ah, you go first, I'll be right there. "

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