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Before World War II, all aircraft in the world were propeller-powered, that is, the piston engine system drove the circular spiral blades to provide power for the aircraft, and then relied on the airflow difference above and below the wings to achieve takeoff and landing.

Up to now, the performance of propeller aircraft has developed quite maturely, and the fastest flight speed has exceeded 500 kilometers per hour.

Therefore, propeller fighters and bombers are the only strength of the air forces of countries in the world today.

徐乐清楚的记得，世界上第一架完成首飞的喷气式飞机是1939年的He178，紧接其后的是1941年的he280和F28。

However, the first jet aircraft to be put into actual combat use was the Me1942 jet aircraft which was first flown by Nazi Germany in July 7.

Its maximum flying speed reaches 870 kilometers per hour. Although it is fast enough to surpass all current piston propeller aircraft, jet aircraft are still in their infancy, with a high failure rate during flight and short endurance.

But no matter how many shortcomings it has, the ME262 jet is ultimately an aircraft that marks a major step forward in human aviation technology and has made a huge contribution to the development of the aviation field.

The reason why Xu Le wanted to select pilots was not because he thought these 500 pilots were not good.

Instead, they used propeller planes for training, and the worst fighter plane Xu Le could buy was the J-5, a jet fighter, which was very different from a propeller plane in operation.

And because of the dramatic increase in flight speed, the physical requirements for pilots are also more stringent.

For example, if the qualification requirement for pilots of propeller fighters is 60 points, then pilots of jet aircraft need at least 80 points.

This is also the reason why during World War II, each country easily had tens of thousands or hundreds of thousands of pilots, but in the 21st century, it is difficult to gather pilots.

Some small countries cannot train a few pilots even if they are given enough planes.

Among these 500 pilots, there must be some whose psychological or physical qualities are unable to adapt to the J-5, so Xu Le has to select these people early.

As for those who were eliminated, Xu Le could only say sorry and let them go back to where they came from.

This is China's domestic development journey. Whether it is a fighter or a bomber, it starts with jet technology, and some people are destined to be eliminated.

The 500 pilots would arrive at Yuncheng Airport from the headquarters one day later, but Xu Le came one day in advance to prepare the fighter jets.

As usual, two guard battalions blocked the airport perimeter and the guard team blocked the interior.

The J-5 is a single-seat, single-engine, first-generation jet fighter independently developed by New China. It is a copy of the Soviet MiG-17 fighter. It completed its first flight in 1956 and went into mass production in the same year.

The aircraft is 11 meters long, has a wingspan of nearly 10 meters, and is nearly 4 meters high. It is a light fighter.

The empty weight is 3939 kg, the maximum take-off weight is 6000 kg, and the maximum flight speed is 1145 km/h, making it a subsonic fighter.

The practical ceiling is meters. At an altitude of 8000 meters, the cruising speed is 800 kilometers per hour and the endurance is 1000 kilometers. It can reach 1500 kilometers when carrying auxiliary fuel tanks.

Its onboard equipment includes ultra-short wave command radio, radio compass, radio altimeter, beacon receiver, friend-or-foe identification device, rangefinder, etc.

The radar detection range is 10 kilometers and the radar interception range is 4 kilometers.

This means that as long as the J-5 appears within 10 kilometers of the J-5, the J-4's radar system can detect the target. At kilometers, the radar can thoroughly analyze the target and its flight trajectory.

The onboard weapons mainly consist of two 23mm cannons on the lower left side of the nose and one 37mm cannon on the lower right side of the nose, with a total ammunition capacity of 200 rounds.

It has an optical semi-automatic sight and two camera guns, which greatly improves the hit rate of the machine gun.

In addition to the machine gun, a 250-kilogram aerial bomb can be mounted on each side of the wing, allowing it to be used as a bomber.

The performance of the J-5 cannot actually be said to be very good, and there are still obvious shortcomings in its endurance, but the air force is not something that can be achieved overnight, and it is very suitable to use it as the air force's initial fighter.

In particular, the J-5 has another model, the J-J-5, which is very effective as a jet training aircraft.

歼5价格为5万军功点，或许是因为不属于战斗用途的原因，晚10年生产的歼教5却只要3万军功点一架。

Because it was a transitional model, Xu Le only purchased one aviation brigade's worth of J-5s and 50 J-5 trainer aircraft.

Regarding the organization of the aviation brigade, he had already discussed and determined it with Jiang Feng. Like the artillery, it would be organized into brigades and battalions.

The squadron is the smallest organization, each squadron has 4 fighter jets, 3 squadrons form a brigade, and 8 brigade form an aviation brigade.

Including the fighter jets directly under the brigade, the brigade has a total of 100 fighter jets.

Of course, the maintenance of fighter jets is of top priority, and each brigade will also be equipped with an additional logistics maintenance squadron. Since these are not combat personnel, they are not included in the establishment for the time being.

[All organizations do not specify logistics and maintenance forces, only combat organizations are mentioned, so you can use your imagination to figure it out.]

This is one of the reasons why Xu Le did not expand the army on a large scale before, and it is also the reason why he did not directly upgrade all equipment to the highest level.

Just this entire aviation brigade cost 500 million military merit points, and with the addition of 50 J-5 trainers, a total of 650 million was saved this time.

And that's not all. Fighter jets are only used to gain air superiority. Once you have air superiority, you will definitely use the air advantage to launch attacks on the ground, so bombers must be deployed.

The bombers that China first used were Tu-2 and Tu-4 purchased from abroad. It was not until the development of the H-1963 in 5 and its service in 68 that China finally had its first independently developed jet bomber.

The H-5 is a light tactical bomber that uses two turbojet engines and a straight wing profile. It was a fairly advanced front-line bomber at the time.

Empty weight: kg, normal take-off weight: kg, maximum take-off weight: kg, internal fuel load: 3800 kg, normal bomb load: 1000 kg, maximum bomb load: 3000 kg.

The maximum flight speed is 902 kilometers per hour, the cruising speed at an altitude of 5000 meters is 696 kilometers per hour, and it can cruise at a speed of 560 kilometers per hour at an altitude of meters.

The practical ceiling is meters, the maximum range is 2400 kilometers, and the combat radius is 560 kilometers.

The front and rear cockpits of the H-5 have thickened bulletproof glass, and in order to shorten the landing run distance, the aircraft is also equipped with a parachute.

The main equipment includes bombing radar, automatic navigator, friend-or-foe identification device and various communication and navigation equipment.

Its bomb bay is in the middle of the fuselage and can carry four 4 kg or twelve 500 kg aerial bombs. There are also eight racks under the wings for mounting rockets or bombs.

In addition, there are two 23mm cannons installed on the nose and tail, with 650 rounds of ammunition, and its own defense capabilities are extremely high.

[Unless otherwise specified, all equipment is subject to the original model. 】