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RD-171

The RD-171 rocket engine

The RD-170 (РД-170, Ракетный Двигатель-170, Rocket Engine-170) is the world's most powerful multi-nozzle multi-chamber liquid bipropellant rocket engine. It burns the Russian equivalent of RP-1 fuel and LOX oxidizer in four combustion chambers supplied by a single turbo pump according to a staged combustion cycle. Designed and produced by NPO Energomash, it was originally used with the Energia launch vehicle.

Shared turbopump Edit

Several Soviet and Russian rocket engines use the approach of clustering small combustion chambers around a single turbine and pump. This results in a shorter but wider rocket motor which is somewhat easier to develop. During the early 1950s, many Soviet engine designers, including Glushko, faced problems of combustion instability, while designing bigger thrust chambers. At that time they solved the problem by using a cluster of smaller thrust chambers.

Variants Edit

The RD-170 is now out of production, but it forms the basis for a family of modern rocket engines.

RD-171Edit

Uma variante RD-170, o RD-171, E USADO atualmente Nenhum foguete Zenit. Enquanto o RD-170 bicos tinham que Rodou em APENAS UM Eixo, o RD-171 gira EM Eixos Dois.

Specifications Edit

  • 4 combustion chambers, 4 nozzles
  • 1 set of turbines and pumps - Turbine produces approximately 257,000 hp (192 MW); equivalent to the power output of 3 nuclear powered icebreakers
  • Ignition: Hypergolic
  • Vacuum thrust of 1,773,000 lbf (7,887 kN)
  • Vacuum Isp of 338 s (3,315 N·s/kg)
  • Sea Level Isp of 309 s (3,030 N·s/kg)
  • Weight: 9,750 kg (21,500 lb)
  • Thrust to weight ratio: 82

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