D-6 - Version C
After abandoning the missile with ballistic fuel, the work continued under the second version of the project. In this case, other technical solutions were proposed that led to significant differences between the two projects. The second version of the missile, adopted for further development, differed from the first one both externally and internally. In particular, it was not planned to use stages of separate architecture in the form of assembly of individual engines.
In the long term, a two-stage solid-fuel rocket could have come into service with submarines with the D-6 complex. The product steps were cylindrical with belt-protrusions on the outer surface. On the tail ends of the hulls of the stages there were several engine nozzles. Between the two stages were to be connected by means of a special cylindrical adapter.
The second stage received a tapering head with attachments for the installation of a warhead. The hull of the warhead, in turn, was to have the shape of a cone with a rounded fairing and a cylindrical base. The head fairing of the rocket also provided for fixing a set of starting engines. In order to reduce the load on the launcher, it was decided to apply a non-standard algorithm for the operation of engines, implying the use of a separate starting power plant.
Both stages of the prospective missile were equipped with solid-propellant engines. Inside the cylindrical body was a charge of fuel "Nylon-C", created specifically for the new missile. Due to its novelty, such fuel required testing and, possibly, refinement. In case of successful completion of all necessary works, a prospective missile could receive an engine of the required power capable of ensuring compliance with the performance requirements.
At the head of the product it was planned to mount 6-8 small-sized tractor engines with solid fuel. They were proposed to be used for launching the rocket from a launcher, lifting to the surface and exiting the water, before the first-stage propulsion engine was switched on. It was assumed that small starting motors of relatively low power would reduce the negative effect of reactive gases on the launcher units, and also lead to some savings in the engine of the first stage with an additional increase in range.
To control the rocket, it was proposed to use an autonomous inertial system based on gyroscopes. The control system had to monitor the position of the rocket in space and keep it on a given trajectory. To change the thrust of individual nozzles, with the help of which it was planned to perform maneuvering, deflector flaps were included in the control system. Also, the control system was responsible for discharging the spent first stage, however, separation of the second stage and the combat unit did not appear to have been envisaged. According to calculations, the automatics had to aim the missile at the target with the CWO no more than 3-4 km when firing at the maximum range.
Under the head fairing of the missile was to be a special combat unit. For use in the D-6 complex, according to various data, "Product 43" or "Article 49" was offered. The nuclear charge of this warhead was 300 kt or 1 Mt.
The rocket with the engine on mixed fuel should have a total length of not more than 15 m with a maximum diameter of 1.85 m. The diameter of the wide part of the combat unit was 1.3 m. The maximum starting weight was limited to 22.5 tonnes. By using two stages with own engines capable of accelerating the product to a high speed and bringing it to a predetermined trajectory, it was planned to bring the range up to 1100 km.
To transport and launch missiles of a new type, the D-6 complex proposed to include mine launchers. Initially, a sample was developed, similar to the one already existing. It was a solid metal cylinder with an open top cover, in which the rocket was to be loaded. Inside there were guides to hold the rocket in the correct position, and a set of connectors for its connection to the on-board media systems. Pre-start filling of the mine with water was not foreseen.
Complex D-6 could become the first domestic missile system capable of launching from under the water. For this purpose, separate launching engines were introduced into the missile. After reaching the line of start-up and opening of the shaft cover, the crew of the carrier had to give the command to launch. The command was to include a battery of starting engines at the head of the rocket. Its pull was enough to pull the rocket out of the mine and then rise to the surface. Only after leaving the launcher, or after leaving the water, the first-stage propulsion engine was to be switched on. Such a start method made it possible to exclude an unacceptable increase in pressure inside the mine due to the operation of the engine. Gases from the starting engines, in turn, were not able to damage the design of the launcher.
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