Seventh Rainy Night: "No, isn't the unpowered sailboat propelled by the wind, and now it becomes a headwind, so won't it be blown back?" ”

Running away by the wind is common sense that everyone knows, but it can still move forward in the face of the wind, which makes the audience a little incomprehensible. Pen, fun, pavilion www. biquge。 info

Seeing the many barrages that appeared on the light curtain, the content was the same as the seventh rainy night, Hu Xiaodao lit a refreshing cigarette and said to the camera: "Maybe your understanding of the sailboat often thinks that it is being pushed by the wind. ”

"In fact, the biggest power of a sailboat comes from the so-called 'Bernoulli effect', where the power of the wind is applied to the sail in two forms: dynamic pressure and static pressure, simply put, thrust and lift."

"Everyone knows the thrust of the wind, so I won't say much, and the lift generated by this static pressure is the same physical principle as the helicopter can fly up, but it is not only that the helicopter is an arc-shaped rotor, and the sailboat is a two-sided arc-shaped sail."

"Although the sailboat can be driven downwind by dynamic pressure or upwind under static pressure. But the direction in which a sailboat can sail is not completely unlimited. ”

"At an angle of about 45 degrees to the right and left of the positive and headwind, it cannot produce effective propulsion and give the sailboat the forward momentum, and at this angle, the sailboat will be blown upwind and run backwards."

"If you want the boat to sail against the wind, the angle between the direction of the boat and the direction of the wind must be greater than 45 degrees and less than 90 degrees, and the Z-shaped circuitous route must be taken, and one of the things that is particularly interesting is that sailing against the wind tends to give the sailboat faster acceleration than sailing downwind."

"As for why it can't be greater than 90 degrees, I think...... You all understand, hehe! ”

As soon as Hu Xiaodao's words were finished, a bunch of spoofed barrages suddenly rolled out in the live broadcast room!

"90 degrees is good, just enough to drive sideways to the shore, find a breakfast shop, and eat a bowl of hot noodles, haha."

"Personally, I recommend a 180-degree walk, just walk for another 20 hours, and King Sao can successfully complete a day trip to the sea!"

"King Sao, make a 90-degree left turn for everyone, and perform a transpacific performance, hehe!"

"I said, friends, can you still have a good time?" Seeing these barrages, Hu Xiaodao was speechless.

That's when --

There was a "chirping" bird call from the cabin!

"Hey, I'm not going to talk nonsense with you, the little comrade lightning inside is calling the breeder, and I've stayed up all night, it's time to prepare breakfast." Hu Xiaodao got up and moved his body, and walked to the cabin with the sail truss.

There are many types of food options available for sea voyages, such as water-soluble paste powder, compressed biscuits with a long shelf life, bread, etc., all of which can be purchased from outdoor stores.

Since Hu Xiaodao was a mercenary, he carried some canned food and military self-heating food this time, although these things did not taste very good, but the calories contained in them were very high, which was completely enough to support the energy he needed to control the ship frequently.

But a year's voyage and a month's worth of food were certainly not enough, and when he left the ship's dense near-sea routes, he had to find a way to get a lot of food.

Ten minutes later!

After eating a 500-gram pack of self-heating beef fried rice, and sharing a 1,000-gram can of canned cod with Xiao Lightning, Hu Xiaodao, who was full of food and drink, his mental state was obviously much better than before.

Turning off the night lights and returning to the helm position, Hu Xiaodao said to the camera: "It's 7:12 a.m. Kyoto time, and my current location is 26 degrees 50 minutes north latitude and 120 degrees 34 minutes east longitude. ”

"Since 9:06 yesterday, I have crossed a parallel line and been on the sea for more than 22 hours so far, and so far I am less than 30 nautical miles from the fishing reef, but since the wind is headwind, I have to drive in a Z-shape."

"That is, the actual sailing distance should be around 50 nautical miles, and in order to reach the Diaoyu Reef before ten o'clock, now I have to sail at a speed of more than 20 knots."

After finishing speaking, Hu Xiaodao looked around at the danger, returned to the main cabin of the sailboat, manually controlled the sail system, retracted the small spinnaker in front, opened the larger spinnaker, and adjusted the force angle of the sail.

After Hu Xiaodao's operation, the hull of the Riding Wind and Waves was blown by the sea breeze and tilted nearly 20 degrees, the wind force of the sails increased, and the speed of sailing gradually began to increase.

As can be seen through the display of the main system of the sailboat, the speed of more than 10 knots, which lasted all night, soon soared to 20 knots, did not stop until it exceeded 24 knots, and has been stable between 24 and 25 knots.

Usually the sailing boat used for competitions, in the case of 15 knots, can reach up to 40 knots, and there is even an unpowered sailing ship named "Hydrofoil", which broke the world record and soared to a terrifying 61 knots.

When the data is converted, it is equivalent to a sailboat that needs to be propelled by the wind at a wind speed of only 27.78 kilometers, which is more than four times the wind speed, reaching a staggering 113 kilometers.

By the power of the wind, beyond the speed of the wind -

This is the result of modern technology!

Due to the fact that Hu Xiaodao's sailboat focuses on sturdiness, it is indirectly equal to weakening the maximum speed of sailing, and in the current situation where the sea breeze is only about 12 knots, doubling the lead is already its limit.

The weather on September 10th was excellent, with blue waves stretching, cloudless skies, and the sea and sky!

In this very good state of vision, and there are no obstacles on the sea, it is possible to see the scenery from dozens of kilometers away just by observing it with the naked eye.

As the sailboat's course continued to change to turn left and right, after sailing for more than two hours, the time came to 9:30!

About one nautical mile in front of the left, at 25 degrees 40 minutes north latitude and 123 degrees 34 minutes east longitude, an island with an altitude of about 362 meters and an area of about 4.3 square kilometers clearly appeared in Hu Xiaodao's field of vision.

Hu Xiaodao, who had been sailing for more than a day, saw that the first goal of the round-the-world expedition was ahead, and the tiredness and sleepiness in his heart were immediately washed away by joy.

"Brothers, my first goal is not far ahead, the old driver is about to start, you guys sit tight."

With the shouting of Hu Xiaodao, the Wind and Waves Riding the Wind and Waves with the full rudder on the right turned into a real little silver dragon riding the wind and waves, and galloped towards the target in front of the left.

Audiences, who are unfamiliar with the Diaoyu Reef, look at the distant islands through the lens, and their hearts are also filled with a touch of pride in being Chinese.