The test flight of Hongdu is in full swing, and the launch test of the Jian-74 multi-purpose fighter-attack aircraft anti-ship missile in Nanhai is also deepening, first the whole simulated environment launch of the simulated bomb, followed by the experimental launch of the anti-ship missile, and finally the real highlight.

"Commander Liu, after half a month of preliminary weapons launch tests, we are now all ready, just wait for your order, we will officially start the final live-fire target test."

When it comes to the final success or failure of the real soldier live ammunition weapon target test, Yu Chief Engineer seems to be more cautious, before the J-74 Southwest Science and Industry almost never played with the research and development of sea attack weapons, and now the J-74 with C801 is still the first time for the big girl to go on the sedan chair.

A veteran chief designer like Chief Engineer Yu is still a little worried, what if he fails at the last moment? Now this aircraft is the focus of the Navy, and if you want to say that in order, it will definitely be in the top three.

Although Commander Liu was also a little excited, he didn't care too much, isn't it just an anti-ship missile that hits the target with live ammunition, and the navy has not done anything before, there are air-launched torpedo attacks and air-launched anti-ship missile attacks, and the C601, a big killer that has been hoisted by a whole level than the C801, has seen it, and the current C801 has nothing to say.

"No problem, you can prepare for the test, this time let the navy send the decommissioned target ship out, and after it is in place, you can take off the plane and start attacking, remember, you only have one missile,"

Commander Liu said this, that is also his own reason, there is no way this missile is too expensive, although the cost of fighting the enemy's warship is very high, but this missile is still expensive.

The Navy doesn't have so much money to waste. Since one missile can serve as a test, there is no need to use two missiles to add insurance as in actual combat.

This aspect of the navy was originally poor for the rich and noble arms. Chief Master Yu has already had a deep understanding of this half a month, and now he naturally understands these problems. Smile and go down to prepare the next steps

Naval weapons tests are making final preparations, and at the same time there is a major event in the north of the Republic of Time. The H-6 large-scale four-engine air tanker developed by Xifei has completed the final flight test assessment at the Yanliang Pilot Test Institute.

Yan Liang Pilot Test Institute is also full of people, after all, it is a military aircraft with a maximum take-off weight of 100 tons, which is definitely a considerable progress, with a 100-ton air tanker based on the bomber, if you want to design according to the same fuselage structure, it should go back, it is a quasi-strategic bomber.

"Congratulations, the comrades of Xifei have finally made a breakthrough in the development of the 100-ton four-engine aircraft, and we may have the opportunity to test the follow-up model of the four-engine H-6 aircraft in the future, and we are convinced of this."

The director of the test flight institute said very firmly to the person in charge who came over from Xifei. This kind of thing is really too normal, but with such an excellent new platform, how can the army still focus on the old-fashioned twin-engine bombardment six.

Xifei's current H-6 is an improvement from the four-engine combat H-6I of the year, and it seems that it is not a problem to change it to the combat type H-6 according to the current experience when necessary.

This side of the Yanliang Test Flight Institute will definitely not be the finalized production site of the bombing oil six, and after the aircraft is finalized, the aircraft will naturally fly back to the Xifei Company to accept the finalization.

After the production of this test aircraft, it has only been flying for less than three years, and the entire aircraft still has more than half of its flight life. If it is repaired, it can continue to be used in the army.

The second-line supply class of large aircraft usually does this, as long as there is no big problem, it is all patched up for another three years, even combat aircraft such as B52 and Tu-95 are like this.

Even some aircraft were directly seconded from the military when they were tested for improvement. After the test, I felt that it would not work, so I cleaned it up and changed it back to the army to continue to use, and there was no reason to waste a tanker like the Bomb 6.

Not all aircraft have violent, frequent test flights like fighter jets. There is only one static test aircraft, and more of them are some flight quality tests. These tests did little harm to the aircraft.

With the four engines starting up, the turbofan 9 derived from Spey 202 engine technology was activated. Although there is no afterburner, this test machine is equipped with a localized enhanced version of the turbofan 9, using the high-temperature turbine technology supported by Southwest Science and Industry, which greatly increases the efficiency of the engine, and the thrust reaches six tons.

Four new turbofan-9 engines provide up to 24 tons of thrust, quickly pushing the aircraft's unloaded H-6 into the sky, and the no-load H-6 thrust-to-weight ratio is much higher than that of H-6.

The two new engines are mounted on the side of the aircraft's wing landing gear compartment and provide more efficiency than the two engines installed at the wing roots for the same thrust.

However, this design is not without its drawbacks, as the two engines are too far away from the fuselage axis, and if the outboard engine fails, the outboard engine on the other wing will provide more yaw torque.

But this kind of problem will not be too obvious in the four rounds of oil and six, one engine on one side is turned off, then just turn off one engine on the other side, and the remaining two engines can still ensure controllable powered flight in the air.

The design of fitting the two new engines near the landing gear compartment of the wing was a deliberate design, why do you say that? This position is too suitable for hoisting engines, and the landing gear compartment is meant to accommodate the landing gear, and the appearance of a larger pod has minimal aerodynamic impact.

On the other hand, since this is where the landing gear is mounted, it will withstand great shocks during take-off and landing, and the structure will be strengthened very strongly.

In addition, the prototype of the H-6 aircraft adopts a skin skeleton design on the wing, and the spar load-bearing weight and outgoing concentrated load capacity are very strong, and it is not a problem to bear the weight of two more engines under the six wings during take-off and landing.

As for the thrust transmission brought by the engine itself after the plane takes off, there is nothing to say, the huge impact brought by the weight of hundreds of tons of the aircraft itself during take-off and landing can be withstanded, not to mention the six-ton engine thrust in flight.

In general, the two new engines are arranged in accordance with the four-engine H-6I aircraft that first flew in 74, which is the simplest and most suitable choice, if you choose to be like the British Comet airliner, the two newly added engines are designed to the wing roots, forming the arrangement of the four engines wing root engine compartment, not only is it inconvenient to maintain, but the entire wing root must be redesigned.

The reason why the airliner with the engine arranged in the wing root was only popular for a few years when the jet airliner appeared, and then disappeared without a trace, is because the design of the wing root engine compartment is too cumbersome.

Due to the need for engine installation and disassembly, the design of the engine compartment should have a large opening, and the position of the wing root engine compartment is destined to be a stress port cover, and the switch of the stress port cover is usually very troublesome, which will lead to the reduction of the maintenance of the aircraft.

These total problems have led to a bizarre engine layout on the Aviation Oil VI: two in the wing root engine compartment, and two in the landing gear pods where the wings are loaded, which looks very discordant.

In the words of the previous fan, this is a typical design without industrial aesthetics, but the layout effect of the wing roots and wing cranes of the soil is the best, and this is enough.

Summary of many years of historical experience: non-native aircraft are not combative, which must be thoroughly implemented in the research and development of aircraft! (To be continued.) )