was never constructed or tested, although a smaller test-stand engine was built and tested as part of development.

Specifications

The RD-701 is a two chamber engine. It can operate in two modes.

The RD-701 has two preburners per combustion chamber, both of which run oxygen-rich. One is used to pump kerosene and oxygen, the other is used to pump hydrogen and oxygen.

In low-altitude mode one, a single preburner burns kerosene with excess oxygen. Hydrogen is injected into

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