The heavy hull of the boat was dragged across the beach, and the wooden boat planks squeezed against the gravel, making a slight friction sound, and small grains of sand collapsed.
White foam washed up on the coast, touching the white wooden hull and moistening it into dark gray. The resistance became lighter and lighter, and Bifang pushed the canoe completely into the sea with a vigorous effort.
Two small boats connected together floated on the sea surface, pushing away the incoming waves, and the sea water poured out along the gap between the connecting platforms.
Seagulls were flying in the skyline, and the waves were sparkling. Above the mast, strings were fluttering in the wind, twisting like wild snakes. Today was a rare windy day.
As an island, there would be no temperature difference or land-sea breeze. However, Easter Island is so big that the vast sea breeze rushes to the land from thousands of kilometers of flat sea surface in a mighty manner.
As a canoe equipped with sails, it is not suitable for going to sea, but Bifang uses a Latin jib. As a professional survival expert, he should use the jib to sail against the wind!
"Are you ready?"
The audience enthusiastically responded to the familiar opening remarks and the whole place was already lively. No need to do much, a large number of barrages flooded the live broadcast room.
[Ready!] [Yes, Captain Bi Fang.] [Too quiet, so quiet, how can you drive a warship?]
Everyone looked at Bifang expectantly. Tourists on the shore stood on tiptoe and held up their mobile phones to take pictures. The audience sent gifts and comments.
Just when everyone thought the fun was about to begin, Bi Fang suddenly grinned: "Who lives in the big pineapple in the deep sea?"
Everyone was stunned and didn't understand why Bi Fang suddenly said such a sentence. But he reacted quickly and immediately responded with a barrage. [It's Spongebob!]
[No, it’s Captain Bi Fang!][Dirty~~~][Too many elements]
[The next sentence is Fangfang Huanghuang can stretch and shrink freely!]
The sudden joke adds a touch of relaxation and joy to the tense atmosphere. "Fangfang Huanghuang can stretch and contract freely!" [SpongeBob SquarePants!]
"If exploring around is what you want." [SpongeBob SquarePants!]
Bi Fang jumped onto the platform on the sea water and hit the hull with a wooden stick, making a unique bang bang sound, like a unique prelude.
"Then knock on the deck to let the big fish clear the way!"
The canoe rose and fell with the waves. Bi Fang stretched out his right arm, wrapped the hemp rope around several times, pulled it diagonally from top to bottom.
The hemp rope rubbed against the wooden pole rapidly, making a violent twitching sound. "Crash!" The pure white canvas was pulled up, and the strong wind instantly swelled the sail.
Bi Fang pulled the rope and jumped onto the aircraft carrier, adjusted the direction of the big sail, and the entire triangular sail cut straight through the strong wind like a sharp blade.
The sudden weight caused the aircraft carrier to sink suddenly, and then rebounded suddenly with the support of the Viking and buoyancy, bringing up a large amount of sea water.
The smooth arms pull the textured rope, and the cold sea water splashes on the naked chest, feeling free and happy.
The jib that cut through the strong wind swelled in front and flattened in the back, just like the huge lift force of the wings of an airplane acting on the canoe, swaying the sea water and accelerating forward.
"Come on!" "Come on!" "Easter Island will record this moment!"
There were people on the shore shouting, cheering, and screaming. The sound was loud, but it was infinitely stretched and far away.
The canoe moved faster and faster, and the cheers behind it became smaller and smaller. When I looked back, it was already insignificant.
Bi Fang laughed heartily, constantly adjusting the sail, confirming the wind direction according to the direction of the rope on the mast, and always keeping the sailboat at the position with the greatest lift or thrust.
This is also the place where the driver’s skills are most tested. [Go, go, go!]
[I used to watch the sailing championship and thought it was so damn cool. I have always had a dream to sail across the lakes and oceans, but I have never had the chance. Watching the live broadcast here is a dream come true in disguise (crying)]
[By the way, why can we move forward even against the wind...]
[The previous one didn’t learn it well when I looked at physics. It’s obvious that this is the basic knowledge of quantum mechanics]
[I don’t study well, don’t lie to me]
[Fifteen centimeters without the head is given to the anchor yacht*1 - Fang Shen is so handsome!]
[The bearded little milk bottle is presented to the anchor with big bones*66 - these damn chest muscles, damn biceps, damn shark gills, licking wildly]
"This is very simple." After simply maintaining stability, Bi Fang fixed the rope and tied it to the mast. He took a moment to look at the barrage and said, "There are generally two broad categories of ways in which a sail can gain force, namely forward blowing and tangential blowing. blow."
"Forward blowing is easy to understand. It means catching the impact of the wind directly on the back of the sail, and then pushing the ship forward. This is Newton's action force and reaction force."
"When sailing downwind, the sail surface is in a 'stretched' shape, and the working condition is best at this time. The larger the sail area, the greater the wind thrust. Therefore, square sails, including square sails and triangular sails, are very suitable for downwind Sailing.”
"The principle is very simple, it is Newton's third law of action and reaction."
"The wind coming from the side will also produce thrust when it is reflected from the back of the sail. As long as the direction is from the back, no matter how it is tilted, it can provide a certain thrust. Here is the tangential force generated, pulling the ship forward. , Anyone who has studied force analysis should know this."
"But taking advantage of the headwind is more complicated, using the Coanda effect and the Bernoulli effect."
[Sorry, I graduated from elementary school, what are these two?]
[Fortunately, I studied fluid mechanics in college, otherwise I wouldn’t really understand it (dog head)] [Physics Master Fang, online]
[Teacher Fang’s class has started. My child is not good at physics. It’s probably because he doesn’t watch the live broadcast enough. He just needs a beating]
"According to Coanda's theorem, when a gas or liquid enters tangentially to this surface, it will flow along a convex surface. And laminar flow along a curved surface will continue to adhere to the same curved surface."
"This deviation from the straight line of the air will produce a force from the sail surface along the camber, and the result is a force perpendicular to the sail. This force is mainly used by modern wing sails."
After fixing the rope, Bi Fang sat in the Viking.
"According to the Bernoulli effect, when the wind blows across both sides of the sail in a tangential direction, the airflow on the former surface passes through a curved surface, and then combines with the airflow on the latter surface again, flowing backward as a chord flow, then the convex front side The rapid air flow will reduce its internal pressure relative to the other side."
"The Bernoulli effect is a content in fluid mechanics. It is generally only found in university professional courses, so you may be unfamiliar with it, but its cases should be clear to everyone, that is, the pressure difference generates a 'lift' perpendicular to the sail - that is, That's how airplane wings work."
[I know this, I studied junior high school physics (face covering)] [Finally I saw familiar content] [In short, you can fly even against the wind, right?]
"It's not that exaggerated. Basically, a side headwind is possible, but a headwind is theoretically not possible, but a complete headwind is rare in actual sailing."
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