People on skateboards.

Incorrect.

He is.

Maybe instead of just saying 'he is' You can actually have an actual debate.

Still haven't learned that a vacuum isn't a force.
If you flow more in than out, what do you get?

I am most disappointed, as we have already established that 'choked flow', or convergent/divergent, nozzles, require back-pressure in order to function.

The combustion chamber of a rocket is open to the near-infinite vacuum of space.

Therefore, no gas can even be meaningfully said to exist within it, let alone combust.

Any gas introduced therein when the pressurised fuel tank leading to the combustion chamber is opened will simply expand freely into the enormous, zero-pressure vacuum, following the path of least resistance & doing no work whatsoever.

This will continue for as long as the fuel tank & chamber are open to the vacuum, until both exterior & interior pressures are equalised at zero.

It is a beautifully simple concept, fully supported by All the laws of physics, yet you 'round earthers' (lol!) just can't seem to grasp it...

But with a rocket you ONLY have object A, the mass of the rocket,  & the expanding propellant, P, the fuel.

No object B, see?

Thus, you have removed the necessary recoil mass required to produce motion.

But we know a rocket DOES produce motion, don't we?

Ergo, some other mass MUST be taking the place of object B.

& the ONLY possibility for that other mass is the Atmosphere.

Ergo, NO atmosphere, NO motion; rockets CANNOT function in a vacuum.

Pressure-Gradient Forces, Gas Laws, Fluid Mechanics, Continuum Assumption & Joules Expansion are the areas I suggest neutral readers research.
Read & Learn!

Quote from: rabinoz on December 12, 2015, 03:57:47 PM

So at which altitude does the rocket stop working

You are acknowledging that they DO stop working when atmospheric pressure is low enough...

But when you say this:

Quote from: rabinoz on December 12, 2015, 03:57:47 PM

look up "choked flow"!

I am most disappointed, as we have already established that 'choked flow', or convergent/divergent, nozzles, require back-pressure in order to function.

indeed, here u go..... should be a nice sunday's reading

Any work I have studied on that indicates that they certainly do not need any back pressure to work perfectly!

Quote from: rabinoz on December 13, 2015, 12:28:52 AM

Any work I have studied on that indicates that they certainly do not need any back pressure to work perfectly!

Jesus Christ you're just making shit up now, aren't you?
GTFO.

Quote from: Papa Legba on December 13, 2015, 12:32:33 AM

Quote from: rabinoz on December 13, 2015, 12:28:52 AM

Any work I have studied on that indicates that they certainly do not need any back pressure to work perfectly!

Jesus Christ you're just making shit up now, aren't you?
GTFO.

I take it that you finally admit that you have no idea how to calculate it!

This stuff is written by journalists!

Sokarul is wrong nearly all the time.  I, however, am not.

Quote from: TheEngineer on December 08, 2015, 12:42:56 PM

Quote from: Papa Legba on December 08, 2015, 12:19:39 PM

Won't change the Fact that you & socky-boy are the only two members who primp & prance around boasting of being 'unndifeetd' though.

Sokarul is wrong nearly all the time.  I, however, am not.

Should be really easy for you to find when I was last wrong. I'll wait.

Quote from: nodnyl on December 12, 2015, 11:52:19 AM

Sokarul, have you ever been to a farm?

Yes

Quote from: nodnyl on December 13, 2015, 07:57:06 AM

Quote from: sokarul on December 12, 2015, 01:05:17 PM

Quote from: nodnyl on December 12, 2015, 11:52:19 AM

Sokarul, have you ever been to a farm?

Yes

Did you gaze lustfully at the sheep?

No.

Do you have a thing educated to say or are you just going to be stupid?

Quote from: rabinoz on December 13, 2015, 12:53:36 AM

Quote from: Papa Legba on December 13, 2015, 12:32:33 AM

Quote from: rabinoz on December 13, 2015, 12:28:52 AM

Any work I have studied on that indicates that they certainly do not need any back pressure to work perfectly!

Jesus Christ you're just making shit up now, aren't you?
GTFO.

I take it that you finally admit that you have no idea how to calculate it!

You can't calculate bullshit.

Which is exactly what your claim that convergent/divergent nozzles 'work perfectly' without back pressure is.

Vacuum conditions

In the case of upstream air pressure at atmospheric pressure and vacuum conditions downstream of an orifice, both the air velocity and the mass flow rate becomes choked or limited when sonic velocity is reached through the orifice.

Quote from: sokarul on December 13, 2015, 08:43:23 AM

Do you have a thing educated to say or are you just going to be stupid?

You're getting very defensive about this.

Where does popular mechanics claim the engine pushes off the atmosphere?

Maybe not, but you can calculate the performance of a De Laval nozzle.
http://www.engapplets.vt.edu/fluids/CDnozzle/cdinfo.html

Quote from: markjo on December 13, 2015, 09:08:50 AM

Maybe not, but you can calculate the performance of a De Laval nozzle.
http://www.engapplets.vt.edu/fluids/CDnozzle/cdinfo.html

LOL!!!

Maybe you should read the sources you quote more closely, Humpty Dumpty.

Besides, you invented a whole new branch of physics called 'Newtonian Multitasking' a few pages ago, to explain how one object can actually be two in order for your 'shpayze-rokkits' to function.

Sokarul was helping you; I believe your triumphant conclusion was that a man jumping up & down was decisive proof of your radical Thesis...

Care to enlighten us further on this 'Newtonian Multitasking'?

Very simple.  Jump up into the air.

The floor is object A

You are object B

Where is the propellant?

That's all the help you are getting!

So papa, what's the Point of a convergent/divergent nozzle and how it works?

They refuse to accept a vacuum is nothing because by accepting it they have to accept that their space rockets are the fantasy they believed to be fact.