Is RD-250 staged combustion or not?

[JucheJuiceMan]

There are people who say it is and others who say it isn't...

[Guest]

Why not go to the source?

http://www.yuzhmash.com/production/index/rengines?id=13

Note that this is the derivative engine RD-262. Other pictures of the RD-250 appear to show an exhaust from the turbopump and some literature talks about it being an open-cycle gas generator engine. It is much more pronounced on later engines. Here's some pictures:

http://www.b14643.de/Spacerockets/Specials/R-16_missile_engine_derivative/

[JucheJuiceMan]

47 minutes ago, regex said:

Why not go to the source?

http://www.yuzhmash.com/production/index/rengines?id=13

It doesn't want to load on me on mobile even in desktop mode on Dolphin browser. Don't have PC anymore.

47 minutes ago, regex said:

Note that this is the derivative engine RD-262. Other pictures of the RD-250 appear to show an exhaust from the turbopump and some literature talks about it being an open-cycle gas generator engine. It is much more pronounced on later engines. Here's some pictures:

http://www.b14643.de/Spacerockets/Specials/R-16_missile_engine_derivative/

Isn't RD-253(different engine) using gas generator/turbopump for oxygen?

[Guest]

1 minute ago, JucheJuiceMan said:

It doesn't want to load on me on mobile even in desktop mode on Dolphin browser. Don't have PC anymore.

No matter, those pictures on the b14643 site are much more telling. The RD-250 and its derivatives (and ancestors, the RD-215 series) are all open-cycle engines, you can even see the exhaust ports between the bells on the assembled missiles/launch vehicles.

1 minute ago, JucheJuiceMan said:

Isn't RD-253(different engine) using gas generator/turbopump for oxygen?

The RD-253 is an oxidizer-rich staged combustion engine but it uses dinitrogen tetroxide for an oxidizer and unsymmetrical dimethylhydrazine as fuel, oxygen is not used.

[DDE]

2 hours ago, JucheJuiceMan said:

Isn't RD-253(different engine) using gas generator/turbopump for oxygen?

Basic lesson on Emergomash nomenclature incoming!

1xx - kerolox

2xx - storeable nitrous oxidizers (NTO, IRFNA)

3xx - fluorine oxidizer (see RD-301, ammonia-fluorine)

4xx - solid-core nuclear thermal rockets (RD-401 through 405, not related to RD-0410)

5xx - advanced storeable propellants (hydrogen peroxide, pentaborane, beryllium compounds)

6xx - vortex-confined gas-core nuclear thermal rockets (RD-600 and electricity-only derivative EU-601)

7xx - kerolox-hydrolox tripropellants

Somewhere in there are stray hydroloxes and methanox conversions