By the end of the draft M-60, the customer and the designers came to not very pleasant conclusions about the prospects for atomoletov. All acknowledged that the benefits of their own nuclear engines have a number of severe shortcomings as a constructive and radiation temper. With all of this specifically in the construction of nuclear engines came up against all the programm. Despite the difficulties with the creation of engines, Myasischev assured the military of the need for the upcoming continuation of research and development work. At the same time, the project involved the installation of a new closed nuclear engines.
The new aircraft has received the title of M-30. By the end of the 1950s designers determine their views. It was a flying machine, made on a "duck" layout and kitted out with 2 keels. Located in the middle of the fuselage and gruzootsekah reactor, and in the rear — 6 turbojet engines closed nuclear cycle. The power plant for the M-30 was developed in the design office, ND Kuznetsova and involves the transfer of heat from the reactor to the air through the coolant in the engine with lithium and sodium in a liquid state.
In addition, the construction of nuclear turbojet Closed allowed to use in their everyday kerosene, which promised to simplify the operation of the aircraft. The corresponding feature of the new engine with a closed circuit had no need for a dense assembly of engines. Through the use of the pipeline with the coolant, the reactor can be shut tightly insulating structures. In the end, the engine will not dispose of radioactive material into the atmosphere, thus simplifying the ventilation system of the cockpit.
In general, the implementation of closed-end motor was more profitable in comparison with the previous one. First, the weight gain was "embodiment." Of the 170 tons of take-off weight of the aircraft accounted for 30 engines and heat transfer system and 38 on the protection of the reactor and the crew. Go with this desired load the M-30 was 25 tonnes. Estimated flight properties of the M-30 nekordinalno deviate from the M-60. The first flight of a new bomber with a nuclear power plant was scheduled for 1966. But a couple of years before all of the projects with the letter "M" have been curtailed. At first, DB-23 enticed to work on another topic, and was later reorganized. According to some sources, the engineers of the organization do not even have time to deploy the current design of the M-30 bombers.
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