Chen Zuwang said to Ming Yan and Chen Liang: "This ship has just warmed up, and its speed is far from being used. It can only reach its maximum speed when it goes to the open sea."
Mingyan said: "This ship is a design drawing brought by the master. I see that the design speed on the drawing is an average speed of 17 knots. The maximum speed must be far more than 17 knots."
The fastest average speed of the clipper ships designed during the American Civil War could reach 16 knots, about 30 kilometers per hour.
The length-to-width ratio of that ship was between 6 and 8, while the Zhejiang's length-to-width ratio reached 9. This was already the limit of the length-to-width ratio. After all, it was rare to reach 10. Such a design would make the ship unstable.
The pinnacle of the clipper ship was the German-made all-steel hull sailing ship Deutschland around 1900, with a load capacity of 8,800 tons and a maximum speed that easily exceeded 21 knots.
Used for ocean transportation of saltpeter ore from Chile, South America to Hamburg, Germany.
This ship once sailed from Shanghai to New York in 88 days, bypassing the Strait of Magellan in South America and not using the Panama Canal. This speed is extremely astonishing.
"So far, the performance is very stable and no problems have been found. Why don't we go to high-speed sailing in the open sea to test it? Anyway, the supplies on the ship are enough for a month. We can go to Jeju Island and then come back to see if we can run in the open sea.
Set the designed maximum speed." Chen Zuwang suggested.
Mingyan was a little worried. She traveled so far on her first trial voyage. If something happened, it was no joke. This ship was too important. It was a reference for building larger clipper ships in the future, so nothing happened.
Otherwise, the success will be in vain.
In addition, there are many technical personnel on board. These people are valuable assets who have built clipper boats, so nothing can happen to them.
Otherwise, it would take too long to start over again. It would be very troublesome if there is a gap in the technical stage, and too much precious time will be wasted.
Chen Liang thought for a while, he couldn't test the real performance by running like this. Jeju Island is not very far. From the chart, if you use the sextant navigation learned by Chen Zuwang and walk in a straight line, it will be a thousand kilometers.
It arrived in two days.
"It is true that running in the inland sea cannot test the real performance. I think we can cautiously run in the open sea to fully test the performance and problems, so as to make further improvements in the future." Chen Liang said.
"There is another problem. We did not design this ship. We know many of the designs but do not know why they are designed in this way. Only by testing the extreme performance can we better understand why it is designed this way."
Chen Liang continued.
Mingyan thought about it and realized that what Chen Liang said was reasonable. Shipyards cannot always rely on external designs. They must understand the principles of this kind of ship themselves and master the methods of research and improvement.
"Let's do this. Let's go out to sea for testing cautiously. If problems arise, we can return at any time. We must not take risks. After all, the trial period is only half a month. Don't be too hasty," Ming Yan said.
After the three people discussed and decided, Chen Zuwang directly turned the rudder to the left, and the clipper did a minimum turning radius test at high speed. Chen Zuwang shouted: "Hold on, everyone."
The hull, which was speeding at 12 knots, suddenly turned sharply to the left. The hull tilted instantly, drawing a huge arc track on the sea. The entire deck of the ship tilted nearly 30 degrees to the left. Chen Zuwang turned back to the helm.
.A boatload of people were almost frightened to death.
The things on the deck were running around just now, all sliding to the left. One unlucky guy was hit in the back by a rolling barrel, and he fainted immediately.
There were bursts of piercing creaking sounds from the hull.
Everyone's hearts were in their throats, fearing that the ribs and keel would break in the next second, and the entire ship would be broken into two parts.
When the turn reached the maximum angle, everyone grabbed everything they could in panic. Watching the ship tilt to the left, they almost thought the ship was about to capsize, and the sea surface was getting closer and closer to them.
Many technicians screamed.
As a result, Chen Zuwang skillfully turned the boat around and restored its balance.
Chen Liang stretched out his thumb and praised: "Old Chen, you really have it. The designed roll of this ship is 29 degrees. You just increased it to 30 degrees and completed the test in one go. You are not afraid of the ship capsizing."
"Don't worry, I have these standards in mind. Once I get started with this boat and run it for a few laps, I will know many of its features. As long as there is a slight danger, I will return to the helm. Don't worry, nothing will happen." Chen Zuwang said calmly.
said.
"No, there is something wrong with the test right now." Chen Zuwang said.
"What's the problem?" Chen Liang asked quickly.
"The design of the rudder is unreasonable. It is very relaxed during normal operation. However, as the hull tilts when turning, the power consumed rises straight up. That means I have a lot of strength, but if it were a young man, I might lose control." Chen Zuwang said.
Driving a boat is like driving a car. Get started and try it out for a couple of laps. Many problems will be exposed.
"Is there anything I can do?" Chen Liang also felt that after the tilt angle became too large, turning became difficult.
"There are two ways. One is to change the rudder plate into a balanced rudder. This can save at least one-third of the effort." Chen Zuwang said.
Chen Liangming nodded. The previous drawings were sent by his master and no one dared to change them. At that time, he had considered using a balanced steering gear.
The balanced steering gear is a major invention in ship technology in ancient China. A general rudder is a wooden board installed backwards in the vertical direction of the rudder stock. By rotating the rudder stock, the wooden board behind it is rotated, which is the rudder surface.
But this is very tiring and requires a lot of strength.
If a wooden board is also installed in front of the rudder stock, just like a shovel with rudder surfaces at the front and back, it will be very labor-saving, because under the action of the water flow, the front rudder surface will have a force in the opposite direction, which can offset it.
The resistance of the rear rudder surface.
"The second way is to change the rudder surface to an open-hole rudder surface."
The perforated rudder surface is also a major invention in ship technology in ancient China. When the rudder surface rotates, it will be resisted by the sea water, so it is very laborious. If a hole is made in the rudder surface so that the water on both sides can flow, it will be greatly
It saves effort on the ground. At the same time, the efficiency of the rudder surface will not be reduced.
This chapter is not finished yet, please click on the next page to continue reading the exciting content! Yang Fan designed this boat by engineers from Hyundai. These technologies are rarely used in Hyundai, so they are not mentioned above.
In addition, this ship was designed based on a merchant ship and did not require as much maneuverability as during combat, so they did not consider this.
After several people discussed it, Mingyan recorded all of this and planned to ask the master for instructions when he went back to use these technologies in the larger clipper ships built in the future.
At this time, the ship has been traveling due east, forming a certain angle with the wind direction. At this time, the mast must be continuously rotated to make the sails consistent with the wind direction.
Although the hull and the wind direction are inconsistent, the wind force can be decomposed into two forces by adjusting the angle of the sail and the wind direction. One is the forward sailing force, which directly pushes the ship forward. The other is the lateral thrust.
.This is offset by sea water.
By taking the zigzag shape and taking advantage of the southeast, northwest, and northwest winds, the ship is not afraid of headwinds, let alone strong winds. The stronger the wind, the faster the speed, but it is afraid of no wind.
By noon, the ship had passed the Changshan Islands, sailed out of the Bohai Sea, and entered the Yellow Sea. At this time, it was obvious that the wind was getting stronger and the waves were getting bigger.
"Check the water depth, check the sea conditions." Chen Zuwang shouted loudly.
"The water is ninety-seven meters deep and the waves are two meters high."
Chen Zuwang checked the wind direction, adjusted the boat to follow the wind, and loudly ordered: "Full sail, raise the jib."
The outline of the ship seemed to swell again. Driven by the strong northwest wind, all the soft sails were swollen and bulging.
The clipper ship flew like an arrow again.
"speed test"
"Fourteenth Festival"
"Fourteen Points Five"
"It's the 16th Festival"
"Seventeen point five."
"It's the Eighteenth Festival"
"Nineteen point nine."
"Twenty-one Day"
Oh my God, everyone was crazy. They actually reached a speed of more than 20 knots, which is equivalent to nearly 38 kilometers per hour.
At this time, the wind and waves became even stronger, with white waves on the sea, dark clouds in the sky, lightning and thunder, and it seemed that a storm was coming.
