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1.5.1 L2 Specifications
Figure 1-13. N-1 rocket configured for lunar flight. The basic rocket consisted of the Block A first stage, the Block B second stage, and the Block V third stage. All stages burned liquid oxygen and kerosene. For lunar missions the LRS was added. The N-1 would have delivered about 100,000 kg to low-Earth orbit. (For a comparison with the U.S. Saturn V rocket, see figure 4-1). Launch weight .......................................... 14,500 kg (estimated) Launch vehicle .......................................... N-1 Length ..................................................... 12 m (estimated) Diameter of living module ........................... 2.3 m Diameter of descent module ...................... 2.2 m Diameter of service module ........................ 2.2 m Maximum diameter
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 * (across aft frustum) ............................. 3.5 m (estimated)

Habitable volume ....................................... 9 m3 (estimated) Number of crew ......................................... 2
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1.5.2 L2 Notable Features
Figure 1-14. Lunar rocket system. Consisted of (bottom to top) the Block G and Block D rocket stages, the L3 lander, and the L2 command ship.
 * Flight-test version, dubbed T1K, was to have been launched on a Proton rocket. However, the T1K flight-test program was cancelled in favor of all-up testing on the N-1 rocket (figure 1-13). Similarly, in 1965, the Apollo program opted for unmanned allup testing.
 * Launched atop an N-1 rocket with a L3 lunar lander and the Block G and Block D rocket stages. Together they formed the lunar rocket system (LRS) (figure 1-14).
 * Long service module contained a large spherical propellant tank divided by a membrane into oxidizer and fuel sections. It provided propellant for a main propulsion system different from the Original Soyuz design. The L2 main engines were not used until after the L3 and D unit separated from the L2 in lunar orbit. The propulsion system provided DV for trans-Earth insertion and course corrections during return to Earth.
 * Had enlarged conical skirt at service module aft.
 * Carried a spring-loaded probe docking system, called Aktiv (“active”), which was designed to penetrate and grip a “honeycomb” drogue docking fixture on the L3. Together they were called
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