Can anyone help identify a rocket motor? ( Succesfully identified, Thanks! )

[CorvusCorax]

Hi,

Last month I visited a private museum that had all sort of old stuff from all over the world - some with unknown origin and unlabeled.

In a hallway I spotted a small rocket engine of unknown origin. There was no plaque, label or anything, and it was in the museum section for agricultural machines. I suspect whoever put it there didn't know what it was.

My guess is, it's some small liquid rocket motor for a military application, but I don't even know if its of American, Russian, European or completely different origin, or from what era. The exhibit has deliberately been destroyed/rendered inoperable by cutting into the main combustion chamber, probably as part of decommissioning. But it could also be a small upper stage for an orbital rocket.

I'm attaching a few pictures. From what I can tell it's a gas generator engine with regenaratively cooled main combustion chamber and throat. The height of the entire assembly is aproximately 90-95 cm from the ground. The turbo pump assemble is horizontal.

The engine is missing its nozzle/nozzle extension, so I cannot tell what expansion ratio this thing originally had.

last picture: human for scale


Edit: Motor successfully identified, many thanks to:

Maybe one of these?  These are SAM missile engines, I think.

https://www.the-saleroom.com/en-gb/auction-catalogues/auction-team-breker/catalogue-id-breker10005/lot-959d1164-131d-40b3-ba05-a53600daeddc

http://www.hieronymusobjects.com/soviet-rocket-engine-aleksei-mihailovich-isaev-2

 - Ed Kyle

Isayev S2.720
Maximum thrust : 34.3 kN / 3500 kgf / 7700 lbf  (20,4 kN at sea level)
Weight: ~105 lbs / 48 kg
Propellant: Storable Hypergolic
Fuel: Tonka (TG-02) aka R-Stoff  ( 50% triethylamine and 50% xylidine )
Oxidizer: AK-20K aka RFNA (Red Fuming Nitric Acid)  (80% nitric acid (HNO3), 20% N2O4 + fluorine-based inhibitor)
Specific impulse: 233 s
Max Burn time: 55s
Chamber Pressure: 64.00 bar.
Thrust to Weight Ratio: 73.64.
Oxidizer to Fuel Ratio: 3.23

Used as upper stage/sustainer for Dvina-M radar guided surface to air missile ( S-75 V-750VM - 11DM)  (booster is using solids)

Apparently these engines occasionally pop up for auction on ebay

Reference: http://www.b14643.de/Spacerockets/Specials/KB-Isayev_engines/index.htm

[CorvusCorax]

[Nomadd]

 If you're ever in the actual middle of nowhere, you should stop in Woomera. Rockets and engines and parts galore with, as far as I could tell, not a single person in town. It was a little eerie. Plenty of emus for company though.

[edkyle99]

Maybe one of these?  These are SAM missile engines, I think.

https://www.the-saleroom.com/en-gb/auction-catalogues/auction-team-breker/catalogue-id-breker10005/lot-959d1164-131d-40b3-ba05-a53600daeddc

http://www.hieronymusobjects.com/soviet-rocket-engine-aleksei-mihailovich-isaev-2

 - Ed Kyle

[CorvusCorax]

Maybe one of these?  These are SAM missile engines, I think.

https://www.the-saleroom.com/en-gb/auction-catalogues/auction-team-breker/catalogue-id-breker10005/lot-959d1164-131d-40b3-ba05-a53600daeddc

http://www.hieronymusobjects.com/soviet-rocket-engine-aleksei-mihailovich-isaev-2

 - Ed Kyle

That first one is a perfect match, the second is an older model.

Crosschecked with different variants from
http://www.b14643.de/Spacerockets/Specials/KB-Isayev_engines/index.htm


This means the engine is an

Isayev S2.720
Maximum thrust : 34.3 kN / 3500 kgf / 7700 lbf  (20,4 kN at sea level)
Weight: ~105 lbs / 48 kg
Propellant: Storable Hypergolic
Fuel: Tonka (TG-02) aka R-Stoff  ( 50% triethylamine and 50% xylidine )
Oxidizer: AK-20K aka RFNA (Red Fuming Nitric Acid)  (80% nitric acid (HNO3), 20% N2O4 + fluorine-based inhibitor)
Specific impulse: 233 s
Max Burn time: 55s
Chamber Pressure: 64.00 bar.
Thrust to Weight Ratio: 73.64.
Oxidizer to Fuel Ratio: 3.23

Used as upper stage/sustainer for Dvina-M radar guided surface to air missile ( S-75 V-750VM - 11DM)  (booster is using solids)

Apparently these engines occasionally pop up for auction on ebay

[CorvusCorax]

If you're ever in the actual middle of nowhere, you should stop in Woomera. Rockets and engines and part galore with, as far as I could tell, not a single person in town. It was a little eerie. Plenty of emus for company though.

Damn, missed it by about 500km when I was last on walkabout in South Australia

[woods170]

Maybe one of these?  These are SAM missile engines, I think.

https://www.the-saleroom.com/en-gb/auction-catalogues/auction-team-breker/catalogue-id-breker10005/lot-959d1164-131d-40b3-ba05-a53600daeddc

http://www.hieronymusobjects.com/soviet-rocket-engine-aleksei-mihailovich-isaev-2

 - Ed Kyle

That first one is a perfect match, the second is an older model.

<snip>

@Corvus: maybe it is an idea to update your opening post to let people know that your question has been answered.

[CorvusCorax]

@Corvus: maybe it is an idea to update your opening post to let people know that your question has been answered.

Good point, done