949 - - 27-09 Quiet 54 Brake and bearing
"First, let's complete the ship with this
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Marcia's cheerful voice echoed through the workshop.
In front of her is the prototype Golem engine that Jin has built.
It is to be mounted on a trimaran, a six-meter-long boat. It is a prototype boat that will be marketed for its high speed, maneuverability, and stability.
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The work itself, including adjustments, was completed in three days. The boat was immediately put to the test.
Marcia is piloting and Arrow is assisting her, the usual combination.
"Marcia, be careful."
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"Yeah, I know, Dad."
It is still fresh in our memories that her father, Rodrigo, had been injured himself in a reckless act when he found Marcia in distress after an unfortunate encounter with the
Marcia is determined to return safely for her father's sake.
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First, they slowly pull away from the shore.
The catamaran glides out into the calm waters of the bay where the dock is located.
"Yes, the boat is as stable as ever. ......That's no surprise."
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The weight of the engine had increased by about 30 percent, but that had been adjusted, so the balance of the ship as a whole was not compromised.
After about 30 minutes we were out of the bay and the waves were a little higher.
"Okay, Arrow, let's go!"
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"Yes, Miss Marcia."
Marcia says a few words to Arrow and starts the engine in earnest.
She does this by depressing the <
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As she steps on the pedal, the amount of mana flowing into the engine increases, increasing its output and revolutions.
"Oh, wow, this is amazing!
You can feel the acceleration. This was something that had never been felt in any engine until now.
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"Didn't Jin say that it has about 4 times more
Simply put, horsepower is torque times rpm. Of course, to obtain a mechanical value, it is necessary to multiply by a constant.
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Since the rpm is low, the stroke is halved and doubled. However, the torque is halved.
Furthermore, the size of one cylinder is made smaller to reduce the size of the engine, and the torque generated is further halved.
To counteract the torque drop, eight single-cylinder (single-engine) Golem engines were gathered together to increase torque = rotational force by a factor of eight.
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This simply doubles the number of revolutions and torque by one half x one half x 8 = 2 times.
Hence, the horsepower is 2x x 2x = 4x.
In addition, since Jin himself made it, the efficiency was further increased by about 20%.
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"Oh, it's fast! This is it!"
Marcia is satisfied with the performance beyond her expectations.
"Marcia, you have a reef ahead of you."
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Arrow's warning. She's so engrossed in the task that she's approaching the reef zone.
"Okay, slow down!"
But...
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"Uh-uh!"
The catamaran, which had gained momentum, did not slow down as much as he had expected.
"Evade!"
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Twisting the stick as hard as she could, Marcia managed to avoid the reef in the nick of time. If it had not been a stable trimaran, the boat might have capsized.
"Oh, that was close. ......"
Marcia realized that the new engines would increase her speed but make it more difficult to slow down.
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"This is a serious problem. ......"
On the return trip, Marcia was troubled.
"I have to tell Jin ...... no, I have to solve this problem myself."
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The dock where the workshop was located came into view.
"Yes, I can help you.
Arrow nodded his head in agreement with Marcia's determined words.
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I'll help you.
"That's not going to be easy.
Isn't it?
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That night, Marcia and Rodrigo discussed the matter knee-to-knee.
"I think it would be best to reverse the screw," she said.
"But that's not part of the engine's current characteristics. I feel like I could talk to Zinn and he'd do it in a heartbeat, but I'd rather save that for the end."
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"If that's the case, hmmm ......."
The discussion continued late into the night.
"Okay, it's done!"
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After a late-night discussion, they decided to try a type of brake that has a plate extend into the water.
This type of brake is used in jet fighters under the name of "air brake. The principle is the same.
Although it is ugly because it is the first prototype, Marcia and Rodrigo are very capable of coming up with it on their own.
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We call it the
Before setting sail again with the modified trimaran, the entire ship was checked over.
"Mr. Marcia, the bearings in the engine are a little worn."
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Jin had warned Arrow about this.
"If we continue to use it like this, it will rattle and the efficiency will drop to 70% in about 10 days.
"So everything is fine today? Then let's discuss this matter after we return home.
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Marcia thinks that she will take care of the problems one by one first.
I'll take care of it when I get back home.
"Yes, yes, it works!
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Marcia tests the effectiveness of the brakes at sea.
The brake plates, which were stretched out in the water where the resistance is much greater than that of the air, performed their role beautifully.
* * * *
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"...... and that means you must have increased the power of the engine. ......"
Jin was pondering the wear of the bearings when he heard from Marcia.
Since this was a problem with the engine, it was only natural that Jin, as the supplier, would be asked to improve it.
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The current bearings are gunmetal.
Gunmetal is an alloy of copper and tin. Therefore, it is less hard than crankshafts made of iron alloys, and thus subject to wear.
But on the other hand, if it were harder than the crankshaft, the crankshaft would wear out.
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"Lubrication, or ......"
Lubrication is the formation of a film of oil or other material between the shaft and the bearings to prevent direct contact, thereby reducing friction and preventing wear at the same time.
"Or use low-friction materials, or ......"
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GSP, which is made from the threads produced by subterranean spiders, has a low coefficient of friction and is therefore dirt-resistant, like Teflon, polyamide, or polyacetal, to name just a few of the materials of the modern earth.
"If only we could use these for bearings."
However, we are a little hesitant to use a material that exists only in Horai Island.
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"Then, other materials or ......"
<
"Ah, I've seen that kind of material before."
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Once Jin and Reiko had killed as many as 50 Death Sea Serpents off the coast of Io Island, and Potlock had benefited from their success.
In other words, the fins of the Death Serpent are a commonly available material, so there is no problem in using them.
"Oh, it's good enough to be used.
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And this fin has a sufficiently low coefficient of friction, although not as low as the GSP, making it an ideal material for bearings.
Thus, the horizontally opposed 8-engine developed by Jin became almost maintenance-free and became the new