Proton rocket stage designators

[Phillip Clark]

The three stage Proton-K had the following production codes for its stages:

Stage 1   -   8S810

Stage 2   -   8S811

Stage 3   -   8S812

Now that we have the Proton-M operating with uprated/modified rocket stages has an "M" been added to some or all of the above production codes?

Thanks.

[Stan Black]

http://www.russian.space/290/

[Phillip Clark]

http://www.russian.space/290/

Thank you.   So did the original designators have the suffix K to inticate Proton-K?   That would be logical but logic doesn't always follow in space matters!

[Stan Black]

http://www.russian.space/290/

Thank you.   So did the original designators have the suffix K to indicate Proton-K?   That would be logical but logic doesn't always follow in space matters!

It appears so, which would imply that Proton was always meant to be three stages?

[Phillip Clark]

So Stan, how about:

UR-500 misile               8S810 + short 8S811

Proton-K                      8S810K + 8S811K + 8S812K

Proton-M                     8S810KM + 8S811KM + 8S812KM

??   Maybe too logical, of course.

The Proton-M was originally referred to as the Proton-KM.

[Stan Black]

The Proton second stage has four engines. One features a gas generator to pressurise the propellant tanks, so it is given a different designation. For UR-500 the engines were RD-0208 also referred to as article 8Д411, and a single RD-0209 8Д412. When it came to the Proton-K they were replaced with RD-0210 8Д411К and RD-0211 8Д412К. So just as the stage is given a K so too the engines.

That’s about as far as the logic appears to go.

The third stage engines of a Proton-K are RD-0213 8Д48 and RD-214 8Д611. No K for the Proton-K.

The Proton-M’s second stage has further improved engines too; and with an additional 5% thrust. There is no new designation or article code?

Whereas the 1st stage engines of the Proton started with RD-253 11Д43, then replaced with RD-275 14Д14, and on to RD-275M but now referred to as RD-276 14Д14М.

I think that the UR-500 was going to be three stages? All liquid fuelled soviet missiles, have some low thrust stage at the final moments. Most have a four chamber steering engine, like you find on the Proton’s third stage?