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The RD-173 engine is an improved
modification of the engine RD-170 (and RD-171). The RD-173 used new materials,
an advanced design of the turbopump and the injector head. The mass of
the engine was reduced.
Chamber pressure and thrust could be increased. Further was worked for
the increased reliability of the engine. Descendants of the RD-173 (the
engine was not used in original) are the engines RD-172, RD-180
and RD-171M. While the RD-170 (and RD-171) had nozzles which swiveled
on only one axis, the RD-171M and RD-180 swivels on two axes. The engine
RD-172 was a variant for the Vulkan project. It is probably the pattern
for the modern RD-191 and further variants.
NPO Energomash considered the possibility of construction several new
variants of RD-170 family engines. The proposed variants will be marked
as:
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RD-180F for Atlas
rocket
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RD-181
variant for Antares rocket
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RD-190
Methane engine
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RD-191M for proposed MRKS
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RD-192
Methane engine
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RD-193
for prospective Soyuz rocket family
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RD-175
for proposed STK rocket
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