The fuel consumption of the Spey engine is very small, which is the advantage of the turbofan engine, especially when the afterburner is not turned on, the fuel consumption rate is almost one-tenth of the domestic engine, that is, because of this fuel-efficient engine, there is a super large range of the J-7 theory, of course, even if the afterburner is turned on, there is no such consumption speed.

What's going on?

Now, Yang Lin had noticed this change, and immediately reported it to Qin Feng, and after Qin Feng heard Yang Lin's report, he was also stunned.

What's going on? Fuel is running out too fast?

There are many reasons for this, first of all, it may be that the fuel gauge is not accurate, after all, any aircraft, there are several fuel tanks, the rules for the use of these fuel tanks are different, which one to use first, which one to use later, there are certain standards, at the same time, the shape of the fuel tank is also different, so it may cause an error in the display, which is also possible.

However, if it is not a problem with the display of this fuel gauge, then it can only be another situation, that is, the fuel tank is leaking!

If the fuel tank leaks, of course, the fuel will be lost at an accelerated rate, which is very dangerous.

On the one hand, these fuels generally do not burn, after all, many aircraft also have air fuel release switches, when Qin Feng flew the Jian-7, in order to make a forced landing, he even deliberately released the excess fuel, but that, it is a special air fuel release switch, generally speaking, at the end of the wing, after the oil is released, the oil mist formed in the air will not generally fly to the vicinity of the engine to be ignited.

However, this is different now, God knows where the oil leaked, if the fuel tank directly in front of the engine leaked, just to the back of the fuel flow, in this case, the whole plane must have been ignited!

In such a situation, it is said that it will not happen, because the engine fire light here is not lit, so what is the problem?

Qin Feng turned his head and wanted to look back, but unfortunately he was blocked and couldn't see anything, now, he thought about it and decided to change his operation, he pushed the operating stick to the left, and then pedaled the rudder on the left, so the fighter plane was in the sky, slowly changing course, Qin Feng tried hard to turn his head to the left, wanting to see what was behind his fuselage.

Under normal circumstances, it must not be seen, so it is necessary to rely on its own maneuver, but it is a pity that this fighter-bomber is too bulky, and it is definitely not as fast as the small and flexible J-7, and now, Qin Feng is working hard, and finally sees something.

It was a thick white mist!

J-7, like a sprinkler truck, splashed fuel into the sky, and after these fuels entered the air, they were quickly vaporized and turned into small droplets, which spread out to form this spectacular scene!

This time there was no tremor, the problem has been ruled out, but now a new problem has arisen, the fighter plane has leaked oil in the air!

When he found out about this scene, Qin Feng's heart sank, this kind of aircraft is the first self-designed aircraft in China, so it is very common for problems to occur, for test pilots, it is necessary to face these problems, but every time it comes, it is so tricky!

"001 report, aircraft oil leak, now request an emergency return." Qin Feng said, as he spoke, he continued to keep the plane turning, and in the sky, it made a big circle.

Different aircraft, different speeds, turning radii are different, the previous J-7 series aircraft, the fuselage is small, the turning radius is only one or two thousand meters, and similar to the F-14 such a variable swept wing aircraft, if the wing is unfolded when turning, the turning radius is also super small, but the current J-7, turning one hundred and eighty degrees, must have a radius of more than five thousand meters to be enough, which can be more reflected in this is a bomber.

If you make a few more turns and land on the runway, it will definitely not work, so just go against the runway line and land directly.

Generally speaking, there is only one runway for domestic military aircraft, there are few spare runways, and now there is only one factory runway, and the runway is narrow and extends to both sides, so does it mean that you can land from either side of the runway?

Actually, there are standards for this.

For example, where is the direction of the runway, this is a combination of factors, first of all, the principle of aerodynamics, in order to shorten the take-off and landing run, the aircraft should take off and land against the wind, so, although the runway has two endpoints, in fact, always from one direction to do the starting section.

For example, in the north, because of the perennial north wind, therefore, most of the runways are in the north-south direction, and always take off and land in the north, of course, it is not only this one factor, the airport clearance, the surrounding terrain and the available area of airport development, the relative location of the adjacent airports, and the relationship with nearby cities and environmental protection.

In short, now Qin Feng has just flown up, and he is flying in the direction of the extension line of the runway, according to normal operation, he needs to make four turns back before he can land, but now, his plane does not have that time, he must make a quick decision and land in the opposite direction.

Another dangerous situation!

When we heard this call, everyone was still immersed in the joy of eliminating the tremors, which was a great victory! Who would have thought that the joy just now has not passed, and a new situation has appeared!

"I see it, the plane is like a sprinkler in the sky!" At this moment, the lookout on the tower also found his own J-7 plane from the sky, at this time, J-7 had completed the U-turn and was flying in the direction of the airport, behind it, dragging a wide trail of dense fog, like a sprinkler truck!

"Quick, quick, firefighting, paramedics in place, airport, emergency preparedness!" Suddenly, everyone became nervous.

According to the headwind take-off and landing, now they are back, it is a tailwind, and they can float for a while, but what, the J-7 is a heavy fighter-bomber, the wing area is not large, but its own weight is quite large, so it can't float far, if the fuel of the plane is leaking, it is likely that it will really not come back!

"Estimate our fuel." Qin Feng was in the cabin and continued to greet Yang Lin in the back cabin.

This is also the benefit of a two-seater, Qin Feng in the front cabin is mainly responsible for controlling the aircraft, and Yang Lin in the back seat can assist in doing some things, for example, it can now be determined that according to the current fuel consumption rate, the question of whether he can go back.