Dnepr rocket launch

[piggoy]

0:44 it looks like it's venting N2O4. That must be really bad for the environment.

[richardpurves]

@piggoy It's actually NO2 gas. Probably just venting that from the oxidiser tank. Either way not nice stuff but thankfully not in great quantities either.

[anisocoro]

If a Dnepr rocket-aka an SS-18 ICBM can launch into LEO a satellite, it can also launch into an orbital pathway a single warhead

[aoliheight]

this beast called ss-18 satan, it consider the most powerful missile ever built, it can carry 10 warheads at once. proudly it's Russian

[blackrainb0w]

prettycool rocket! where can i buy one?

[Ardon001]

I used to machine the UK's 16 submarine ballistic silos so when Armageddon does happen then I can proudly say ' I built those silos!'

[CrowTHuman]

What's the puff of red smoke that appears about two thirds of the way up the length of the rocket on the send and third launches? It appears a few seconds after launch and only lasts a few seconds.

[Ardon001]

@CrowTHuman

Sub bound ballistic missiles are shot outta their silos by compressed air and the missile actually never touches the water!!!!!!!

[scotjack]

It looks like some sort of timed charge that ignites the rocket fuel.

[richardpurves]

@scotjack The fuel used by this rocket is hypergolic ... or explodes when mixed. No external ignition is necessary.

[scotjack]

@richardpurves Thank you. (How do you guys know so much about rockets?)

[richardpurves]

@scotjack I've built a couple flying models. I studied Chemistry for a while before giving it up to work in IT. Ooops.

[regulus2169]

@CrowTHuman That would be the solid-propellant gas generator that is used to pressurize the fuel tanks. When the tanks are pressurized, the excess gasses are bled off.

[msotil]

Es polvora (negra) la que impulsa al cohete fuera del silo. A unos 20metros de altura, recien enciende la primera etapa.

[neverfearchrisishere]

swords to ploughshares :)

[apologiate07]

quoth the bbc

[scotjack]

In the last few seconds of this video, the rocket trail seems to be water vapour (white clouds). Why does this happen then and not earlier?

[twohco]

@scotjack If you are talking about the bright white light at the back end of the rocket, I think you are seeing the flame emerging from the rocket motor. The rocket changes orientation as it rises, and you are looking "into" to tank more toward the end than at initial launch. I also think there may be a reflection of the sun off the back end.

[apormarkos]

@scotjack- the rocket hit an altitude where the water vapor could turn into a cloud instead of dispersing

[raymondgoubet]

Because exhaust vapour trails (or contrails) usually occur above 8000 metres (26,000 feet). where the temperature is below -40°C (-40°F).

[scotjack]

Thank you (and apormarkos) for your answer. Your knowledge of physics obviously far exceeds mine!

[Adolfinthemix]

Que es el humo rojo que le sale al cohete apenas sale?, le sale de la mitad...

[Squarkino]

Es el tetróxido de nitrógeno que emplea como oxidante (el combustible es hidracina).

[Adolfinthemix]

Muchas gracias por la respuesta viejo. Tenes idea de porque lo larga por ahi? y tenes idea tambien de si se usa propergol solido o liquido en este tipo de cohetes?