From one extreme to another.
"Scientists from the Central hydrodynamic Institute named after Zhukovsky (TsAGI) examined the project of creation of a military helicopter with a high-speed rotary rotor and started to work on it, according to the institute's Web site.
Leading engineer department of dynamics and aerodynamics of helicopters Valeriy Gorban said that the realization of this ambitious project will significantly increase the speed of movement of the aircraft for at least 200 kilometers per hour (with 400 km / h to 600-700 km / h). The expert also highlighted some of the difficulties in implementing the concept, the main of which is to ensure the handling and stability of the machine at the time of transition from the "helicopter" flight mode to "the airplane" and in the opposite direction.
Right now TsAGI experts are studying the scheme of military rotorcraft, which will be able to stop in-flight rotor-wing. "
(Military materials Excellence in heaven. Russian combat helicopters will be the fastest in the world).
Interesting article and reading pleasure: finally, our scientists began to search for ways out of the impasse of stagnation in the helicopter. But what confuses me:
a similar project already offered S.V.Miheevym still 2008g. and speed - up 800k / h, "the first time the concept of the model helicopter is shown during the international exhibition« HeliRussia-2008 »(Wikipedia). And if such a helicopter is really necessary, the JSC "Kamov" on this subject has, as we see the finished project for a long time and all the theoretical study and Nira held without a doubt (scientific research work). Sergei Viktorovich Mikheyev project - similar but not the same: after the rate set in the blades of the helicopter mode, the screw does not turn into the wings, and are cleaned in a special case "to" back "helicopter" that does not change the fact.
And Sergey Viktorovich, as you know, words can not soritsya: test pilots at lower helicopter Ka-50 reached 460k / h speed. (Wikipedia) helicopters have projects with rigid blades assumed cruising speed of more 400k / h, so the CB "Kamov" Ka project-90 - a natural continuation in the improvement of its products.
But designers Mil. Mil high speed until now were only pictures of Mi-H1 and layouts, and helicopter design with a rotor-rotor, if I understand correctly, is designed specifically for them. This is called "to extremes!" Mi-28N supplied service in our FSI develops a maximum speed = 300k / h. and this immediately undertake the development of a helicopter with the speed of the exotic in 700k / h.
A transport Mi-8, «cool» upgraded over the decades, and it flies slower: with more and more powerful engines could not get out of 230k / h speed. to this day. His big drag is easily visible in the picture, especially the additional tank barrel.
And this is not all. In order to get a flight range of up to 1400km, compacted and the cargo compartment of the same barrels of kerosene.
That would look like a modern helicopter cabin.
This interior design Ka-102 with a range = 1100km.
This interior design and lower class helicopter Ka-92 with a range = 1400km.
Below - fuel tanks made integral with the fuselage, and what should be advanced fuel tanks.
You see the difference in the culture of the design?
I believe that with a serious attitude to the modernization of the speed characteristics of Mi-8 helicopter would long ago have had Vcr. = 270-290k / h. Just wanted to remind designers to cost centers as first-graders, that a large drag on the helicopter - it's fuel consumption, which reduces the range and useful load, raise the price of the helicopter!
But back to the above-mentioned "concept", where "The expert also highlighted some of the difficulties in implementing the concept, the main of which is to ensure the handling and stability of the machine at the time of transition from the" helicopter "flight mode to" the airplane "and in the opposite direction."
I believe, then the shortfall: in my opinion, the author did not indicate another problem of this scheme. Suppose that after dialing the desired speed in the helicopter propeller-wing regime was stopped and then the blades should work as wings. Here's the rub! The blade, which is stopped in the oncoming flow of the trailing edge, which corresponds to a negative corner of the mounting rotor blades and correspondingly negative lift force of the blades, and the need - the positive, which is possible only with a positive angle mounting. In this and see the problem with a permutation of the blade from a negative to a positive angle. If the helicopter take off and accelerates to the set speed in helicopter mode, meaning it has a swash plate, by means of which deviates cone rotor in the right direction and that is able to change the setting angles of the blades. But it works as follows: or increases (decreases) the angles at once both blades simultaneously, or changing the installation angle of a blade, and also simultaneously receives the other blade, but in the opposite direction. And in this case you want to change the installation angle of only one blade at an angle equal to the angle of the blade opposite that with the help of the swash - categorically ruled out! And it is doubtful that this century may appear swash plate capable of changing the installation angle of only one blade, so I see no reason to chase the "pie in the sky", as it was with the mythical project Mi-H1 and better design the real helicopters available today features.
Generally in our country on this issue some strange things: when was born the project of high-speed Ka-92, then follow the teachings of cost centers created false project Mi-H1, with the characteristics of the "best" project Ka-92 and Kamov project lost funding than was actually frozen. Then the chief designer of the project false Mi-H1 "povtiral glasses" N.Pavlenko people to this "project" in the pages of the media and the Internet, and as soon as the Ka-92 was frozen, forgotten soon and Mi-H1, and N.Pavlenko. If such a "project" drew a schoolboy, he could say: "You did not teach the theory of the helicopter flight, so you do not know that after 400k / h speed. due to the difference in lifting force of the rotor right and left halves of a single-rotor helicopter flipped upside down and on this his career ends. But the project came from the professional designers of world renown, therefore, he had intended to simply freeze the real project of Ka-92, which was in reality. The only difference is that while lzheproekt Mi-H1 came from KB cost center, and is now trying to come from scientists TsAGI, but it seems to me that the essence is the same: to prevent the project Ka-90! And God grant that I made a mistake in judgment!
I believe that scientists TsAGI and general constructors instead of cost centers like searchlights to do the replacement of obsolete and very expensive Mi-26 a more modern economic model.
The world's best combat helicopters produced by JSC "Kamov": Ka-50-52 and Ka, as well as marine Ka-27 -ubeditelnoe proof, so work on combat helicopters leave for kamovtsami. For example, I really do not understand that today, instead of the world's finest combat helicopters Ka-50 «Black Shark" on arms supply enough useful in modern warfare helicopters Mi-28N. By the way, the expected holding its modernized version is a bit better, although it is very praising leaders holding! But this - the usual advertising mediocre product! It is said that a good product does not need to advertise - it advertises itself. I remember a senior Slusar also broadcast loudly that the Mi-28N not yet launched in the series, and has all foreign customers for them. At the same serial production could only persuade Iraqis of the Iraqi prime minister then excuses himself from the corruption of the transaction on the Mi-28N.
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