When they saw the appearance of the flying ship, almost everyone was stunned.

The length of the Airbus A380 is 72.75 meters, the wingspan is 79.75 meters, and the height is 24.09 meters, and this is already the largest passenger aircraft on Earth.

But compared to this flying ship in front of them, the Airbus A380 was completely dwarfed.

The exterior of this flying ship shimmered with a multicolored glow, allowing it to fully reveal its body even in the darkness.

In everyone's previous imagination.

The word "flying ship" should have been just a moniker, and in reality, it should resemble the shape of a blimp.

For instance, the flying ship in the Wei Mansion that can carry seven people, its exterior looked almost no different from a larger canoe.

But the flying ship of Ziqiong City....

Its shape was truly that of a ship!

With actual sails, no less.

This flying ship was about four hundred meters long, roughly one hundred meters wide by visual estimate, the hull height exceeded sixty meters, and the sails' height had to be at least another hundred meters up.

This was a behemoth rarely seen, or rather, unseen on Earth.

To put it in perspective, the Diamond Princess, one of Earth's fifteen most luxurious cruise ships, is only 290.4 meters long, 48.2 meters wide, and 62.5 meters high overall.

Not to mention, a flying ship can soar in the sky!

Looking at the colossal figure in the sky, Wang Qiang couldn't help but murmur:

"A ship so large can still fly in the sky, no wonder it's rumored that a single flight requires consuming over a thousand Spirit Stones...."

According to the intelligence provided by the Wei Mansion.

The flying ship of Ziqiong City, upon activation, consumes at least fifteen hundred Spirit Stones.

With an exchange rate of 1:6100, that converts to over nine million Huaxia currency.

It was mentioned previously.

Ziqiong City's three flying ships each have fixed flight routes which are generally circular, so their flight distances are much longer than the straight-line distances between the city-states.

On average, each flying ship travels a total range of about 2000 kilometers per journey.

Similarly focused on cargo transport, let's compare it with the rabbits' green delivery ship, Liaoning.

The Liaoning is 304.5 meters long, with a beam width of 75 meters, and in volume might be slightly smaller than the flying ship.

The Liaoning burns heavy oil for fuel, and the current cost of one ton of heavy oil is about 2100 Huaxia currency; the Liaoning consumes 380 tons of fuel to travel 777 kilometers on average.

Based on these figures.

The Liaoning would consume around eleven hundred tons of fuel to continuously travel over two thousand kilometers, with fuel costs amounting to roughly two to three million.

So, by this comparison, the cost of fifteen hundred Spirit Stones for the flying ship is really not that expensive – after all, the flying ship flies in the sky, and the energy consumption for aircraft is generally three to four times that of ships.

Meanwhile, at the instant of seeing the flight.

Back at the command center in the distant valley.

Watching the footage transmitted back from the recording gear on Lin Ziming, Zeng Gu Cheng's eyes almost lit up, his lips trembling at this moment:

"For this shape to be able to fly, it definitely isn't using gas filling nor relying on relative motion with the air, see how it descends in the footage, this is anti-gravity technology, anti-gravity!"

Anti-gravity technology is currently a highly controversial concept.

Just from the description, it seems very simple:

The so-called anti-gravity system provides an external force to an object, and when this force counterbalances gravity, a person can float.

Currently, we have many technologies that appear to achieve this.

Such as airplanes, rockets, maglev trains, etc.

But these are actually unrelated to anti-gravity—not even a little bit, including maglev trains.

Because anti-gravity requires building a gravitational force field, whereas airplanes merely utilize Bernoulli's principle.

In other words.

If an airplane has no relative motion with the air, it can't fly, but anti-gravity can.

The real core of anti-gravity is having the object itself generate energy that cancels out gravity.

To make it more understandable to students who rarely hear this, the further explanation is:

An airplane flying in the sky is not anti-gravity; only when ordinary people can stand in the sky and build planes, that's anti-gravity.

The reason why anti-gravity equipment can't be created is simple:

Under the current theoretical framework, humans have no means to shield the influence of gravity, to eliminate the inertia of objects, or to make aircraft accelerate in reverse under gravity; humans also can't create exotic materials with negative mass.

Although effects like Casimir can offer equivalent negative mass, the amount is too small to be effective for anti-gravity.

After all, the core of the current gravitational theory system is still primarily based on Einstein's field equations.

As is well known.

Einstein's field equations describe gravity as the curvature of spacetime caused by mass and energy.

As long as the distribution of matter and energy in spacetime can be observed, the curvature of spacetime can be calculated, and hence the result of spacetime curvature.

This explains well the perihelion precession of Mercury, gravitational redshift of light, and the bending of light in a gravitational field.

For over a century, the experimental data obtained through astronomical observations align with general relativity far better than other theories attempting to explain gravitational phenomena.

But it is precisely this model that has helped humans take many steps forward, that does not allow for the existence of so-called anti-gravity vehicles.

Even if you use a large mass of negative mass to produce curvature changes, what you get is not anti-gravity, but a warp drive with immensely destructive power.

There's no way, because the technological tree on Earth is still too limited.

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