Old Russian Liquid Fuel Rocket Engine - Complete

[Shane Savage]

I found this rocket engine for sale in the EU complete and un-used. It was apparently designed during the Soviet era for use in military rockets. I am sure someone on the experimental side of the high power rocketry hobby could find an interesting use for it and potentially re-purpose it.

Thoughts or comments?

 

[rocketkyle]

I would love to hang that in my basement

 

[PayLoad]

Link Please? This is so drool-worthy...........

 

[waltr]

How big is it????
Need something in photos for scale. A meter stick would be ideal.

 

[tim cubbedge]

This looks like it on eBay:
https://www.ebay.com/itm/3738691607...QpK6xBjzDGgt6g1JyFlttkIS8VNz-hbgaAn1JEALw_wcB

 

[Shane Savage]

I would love to hang that in my basement

Do doubt but I would love to hook it up to some tanks and let it fly!!!

 

[Shane Savage]

Link Please? This is so drool-worthy...........

It is on an EU auction site but has been up for a long time. He had several of them and has sold a couple. First $20k takes it and I can broker the deal!

 

[Shane Savage]

This is the last one he has too!

 

[Shane Savage]

This looks like it on eBay:
https://www.ebay.com/itm/3738691607...QpK6xBjzDGgt6g1JyFlttkIS8VNz-hbgaAn1JEALw_wcB

That’s the one!!!

 

[Shane Savage]

How big is it????
Need something in photos for scale. A meter stick would be ideal.

Nitric acid / Amine liquid propellant engine.
New engine, has never been used, still sealed.
Type: S2.720
Thrust: 34,3 kN (7 711 lbf; 3 500 kg)
Engine weight: 48 kg (105 lb)
Chamber pressure: 64 bar
Height: 0,95m (3,1ft)
Diameter: 0,48m (1,56ft)
Designed by the bureau of Alexei M. Isayev in 1960s.

 

[PayLoad]

It is on an EU auction site but has been up for a long time. He had several of them and has sold a couple. First $20k takes it and I can broker the deal!

Yuk, man, just yuk

 

[rharshberger]

Nitric acid / Amine liquid propellant engine.
New engine, has never been used, still sealed.
Type: S2.720
Thrust: 34,3 kN (7 711 lbf; 3 500 kg)
Engine weight: 48 kg (105 lb)
Chamber pressure: 64 bar
Height: 0,95m (3,1ft)
Diameter: 0,48m (1,56ft)
Designed by the bureau of Alexei M. Isayev in 1960s.

I wonder if its propellants are RFNA and UDMH, which is likely since the engines were used in military missles and both are "storeable propellants".

 

[ksaves2]

Do doubt but I would love to hook it up to some tanks and let it fly!!!

Yeah sure. Try to get the tankage for fuming nitric acid and dimethyl amino ethyl azide!
Rocketkyle has it right. Hang it in the basement as it would be darned near impossible for an
amateur to handle the dangerous propellants. Kurt

 

[Shane Savage]

I did a little more research and found that yes, it was used as the sustainer stage in the S-75 surface to air missile. Below are the fuels and oxidizers used. Max burn time was 55 seconds.

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)

I wonder if it could be reconfigured to utilize other fuels/oxidizers?

 

[tsmith1315]

I am sure someone on the experimental side of the high power rocketry hobby could find an interesting use for it and potentially re-purpose it.

Jet pack?

Single use, of course.

 

[techrat]

Do they let you use liquid propellant at a Tripoli event? Maybe some enterprising young man with $20,000 to spare could build a nice rocket around this motor...

 

[Antares JS]

I wonder if it could be reconfigured to utilize other fuels/oxidizers?

Maybe, but it would not be easy. It's the same kind of thing as trying to get a gas engine to run on diesel.

Do they let you use liquid propellant at a Tripoli event?

No.

 

[techrat]

Then again, transporting 10,000 gallons of fuel is going to be an issue.

 

[cls]

S-75 surface to air missile

My favorite

https://en.m.wikipedia.org/wiki/S-75_Dvina

SA-2 Guideline for NATO.

I've built several scale models in BT70 booster, BT60 sustainer. I have 6" and 5.5" airframe tubes, rings, nose cone, etc for an HPR version. I guess that's about 1/5 scale. It's on the someday list...

 

[rharshberger]

Then again, transporting 10,000 gallons of fuel is going to be an issue.

especially R-Stoff/Tonka-250 and RFNA, both are extremely hazardous to handle and transport.

 

[Bill S]

Wow, I could see at the very least, the EPA crawling up someone's backside if they tried to get "permission" to import it or actually use it.

 

[aerostadt]

The design propellants are also hypergolic. If they just touch other, you've got serious combustion.

 

[rharshberger]

The design propellants are also hypergolic. If they just touch other, you've got serious combustion.

That too!

 

[Blast it Tom!]

A very expensive piece of workshop art!

 

[Q38]

SA-2 Guideline (V-750VK Dvina) Surface-to-Air Missile Upper stage engine, first stage was a BIG solid. This is the same upper stage that shot down Gary Powers in the U2. Ussually fired in cluster, radar homing. Airframes and guidance units were readily available in the CZ Republic a few years ago. The fuel combination needs to be hypergolic to start the engine, it runs on a gas generator cycle, it can be reconfigured to run on kerosene IF you pilot it with Tonka (amine xylidine) - legacy WW2 German propellants. The nitric acid based oxidizer (nitric acid, NTO) - the NTO is to increase performance, the fluorine just passivates the tanks for long term storage. The O/F ratio is fixed since the gas generator runs a common shaft turbo pump (fuel pump and ox pump are tied to the same shaft), feedback control is a fluid servo control. Hit the start button and it runs with and integrated controller, no electronics. It is a testament to Soviet engineering design. These are also mostly likely “appropriated” Soviet state property, but who care! They most came out of “demilled“ SA-2s but the engines were not destroyed. They were merely taken apart. The seals are the blow out disc for the high altitude start. The seal on the turbo pumps are rupture disks. These are very integrated engines, deviating much from the from the original propellants would prove difficult - especially the gas generator. I have yet to see the propellant tanks for sale but they may (?) have been integrated into the airframe. The only possible reconfiguration might be HP with hypergolic “alcohol” based fuels…. With the emphasis on might. More importantly the SA-2 is still in use in some countries without the most modern anti aircraft systems.

 

[Hobie1dog]

what a post Q38

 

[Hyak]

Dang It!!! I am Scratch-building a S-75 Dvina on my bench right now!

Sadly its designed to fly on H's & I's....
I knew I should have gone with 1:1 Scale!

 

[Q38]

Thank you!

 

[G_T]

Just a point, MFPA 1127 allows N2O + methyl or ethyl alcohol liquid systems. This came about because of the tribrid rocket motor. Unless I'm mistaken, TRA would allow that combo, since that is how it got into 1127 in the first place.

Someone can correct me if I'm wrong.

Gerald

 

[rharshberger]

Just a point, MFPA 1127 allows N2O + methyl or ethyl alcohol liquid systems. This came about because of the tribrid rocket motor. Unless I'm mistaken, TRA would allow that combo, since that is how it got into 1127 in the first place.

Someone can correct me if I'm wrong.

Gerald

Weren't the Tribrids also part solid fuel as well? The motor being discussed here is a pure liquid system that may be the difference if you ignore the S2.720's fuels.