My item has an upgrade panel

Chapter 55 Variable Bypass Ratio

"What kind of plane is this?"

Tang Rui's eyes widened, looking at the screen in a daze.

He had never seen this plane.

But he is sure that this thing must be Yingjiang's latest supersonic stealth reconnaissance aircraft.

"This appearance is different from the disclosed goddess of dawn."

The drone chased after it.

Using the optical system, the aerodynamic shape and body structure of the entire supersonic stealth reconnaissance aircraft were photographed.

Tang Rui looked at the [-]D model on the screen, and his brain was calculating rapidly.

"Integrated forging technology."

"Scramjet."

"Long fuselage short wings."

He thought for a long time according to the condition of the airframe, and suddenly thought of a verification machine for Eagle Sauce.

HTV-3X Black Swift.

It is said that this verification machine is a technical reserve and technical verification for the development of SR-72.

In the outside world, this verification machine is not well-known. Compared with the goddess of dawn, it is far behind.

But who would have thought.

This thing has already started a secret test flight.

"Fuck!"

Just as Tang Rui was thinking, the dog started to speed up.

He glanced at the map.

It was found that he had returned to the domestic airspace.

No wonder it has to speed up. If it flies slower, it is easy to be shot down.

Tang Rui also pushed the throttle, allowing the drone to catch up closely.

But soon he found out.

The drone couldn't catch up.

Even if he has pushed the speed to the maximum, reaching Mach 4.2.

But compared with the supersonic stealth reconnaissance aircraft that reaches Mach 6 or above, it is still too far behind.

Less than 5 minutes.

The reconnaissance plane completely disappeared from Tang Rui's sight.

Radar can't scan it.

Optical system tracking, only a blurry point of light can be seen.

Tang Rui pulled down the throttle valve, exited the afterburner state, and let the drone enter the subsonic cruise state.

Very upset.

It's not that he doesn't work hard.

Mainly an engine problem.

Turbojet engines and scramjet engines are not on the same level.

The engine must be upgraded.

Tang Rui has decided that when he comes back this time, he will strengthen the drone's engine.

Three in the morning.

He exerted himself and controlled the drone to land.

Run to the drone.

Look at the system panel.

The experience value of the drone has long been overflowing.

[Item: Perfect Reconnaissance Drone +4]

[Experience: 87363/26000 (upgradeable)]

[Enhancement: body, avionics, engine, energy]

[Feature: High-precision scanning]

[Source point: 5.64 (can be strengthened)]

Without further ado, Tang Rui clicked to upgrade.

A blue light flashed.

The drone has been upgraded.

However, in this upgrade, the body of the drone has not changed, but one more feature has been added.

Strong stealth performance.

Tang Rui looked at the experience column and found that he could continue to upgrade.

Click Upgrade.

Another blue gleam flashed.

The drone has been upgraded.

[Item: High-performance stealth unmanned reconnaissance aircraft +6]

[Experience: 3363/? (not upgradeable)]

[Enhancement: body, avionics, engine, energy]

[Features: high-precision scanning, strong stealth performance, weak radiation signal]

[Source point: 5.64 (can be strengthened)]

Two levels in a row.

Both prefixes and terms have changed.

Added two features.

And enter the non-upgradable state again.

Looking at the brand new system panel of the drone, Tang Rui fell into deep thought.

Follow previous upgrade experience.

If you want to upgrade the drone to level 7, you need to strengthen the equipment.

Moreover, it is necessary to strengthen all the equipment before upgrading.

Drones are not fascia guns.

There are too many devices and systems that make up a drone.

If it is fully strengthened, it is estimated that the source points needed are dozens, or even hundreds.

A thought here.

He was a little speechless.

This requires too many sources.

"Strengthen the engine first and see the situation."

Tang Rui decided not to care so much and strengthen the engine first.

Select Enhanced Engine.

moment.

Several options appear.

Structural strengthening, material strengthening, turbine strengthening, combustion chamber strengthening, compressor strengthening and nozzle strengthening.

Among them, structural strengthening and material strengthening both require 5 source points, while the remaining enhancements only need 2 source points.

Tang Rui thought about it, and chose to strengthen the structure.

In fact, material reinforcement is also very important.

But the problem is that even if he strengthens the material, he still needs to start from scratch.

It's hard to say whether it can be done.

The structure is different.

After strengthening, he can scan it three-dimensionally and use it directly.

So for him.

Or the benefits of strengthening the structure are relatively high.

Swish.

With a flash of light, the strengthening is complete.

The structural reinforcement of the engine is invisible from the outside.

He towed the drone into his car and drove home.

It was almost four o'clock when I got home.

The original sleepiness has disappeared.

"Staying up late is harmful to your health, so stay up all night."

After muttering something.

He dragged the drone into the basement.

"Let's do it!"

Put the drone on the workbench, grab the tools, and start disassembling the engine.

He wants to know.

What is the situation with the enhanced engine structure?

After half an hour.

One engine was taken apart by him.

Tang Rui took the [-]D laser scanning device and began to scan the engine in all directions.

On the computer screen next to him, as he scanned, the three-dimensional model of the engine slowly appeared.

Wait for him to scan.

He took the computer and looked at the engine structure on it.

A problem was discovered immediately.

The overall structure of the engine is too complicated at the moment.

"This is a variable bypass ratio structure combining single duct (turbojet) and double duct (turbofan)."

Tang Rui took a closer look and found that the overall structure of the engine had changed a lot.

Especially the variable bypass ratio.

This thing can also be regarded as a kind of black technology with a slanted sword.

What is bypass ratio?
Simply put, it is the ratio of the air flow in the external duct of the engine to the air flow in the internal duct.

Current aircraft engines have a fixed bypass ratio.

For example, the F-22 engine has a bypass ratio of 0.29.

As for our J-10 and J-15, the bypass ratio is in the range of 0.6-0.8, and the exact number is unknown.

Then the problem is coming.

Is the bypass ratio better to be bigger or smaller?
The answer depends on the situation.

For aircraft that don't need supersonic cruise, a larger bypass ratio is better.

For aircraft that need to cruise at supersonic speeds, a duct is better than a smaller one.

This is only approximate.

Ordinary people can understand this.

So what about the black technology of variable bypass ratio?

That is, when cruising at subsonic speed, the engine is in a state of high bypass ratio, and extra air enters the combustion chamber to make the fuel burn more fully, increase thrust and reduce fuel consumption.

When entering supersonic mode, the valve is closed, and only a small amount of air enters the outer duct, which is responsible for cooling and afterburner.

Such a change can increase the thrust-to-weight ratio of the engine, and it is also more fuel-efficient.

(End of this chapter)