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Message Subject Rockets need an atmosphere to propel
Poster Handle Balance242
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Secondly, the initial evacuation, the airflow was strong enough to lift a penny against gravity, but there is no observable force on the scale.
 Quoting: Balance242


What type of scale were you using? How many decimal places of pounds or Kg did it display? The scale would absolutely show the removal of the weight of the penny and some reduction in air volume were it accurate enough.


Additionally, you also said a nozzle is not required for a rocket to work in a vacuum in your previous post. So what you are saying is irrelevant. Optimization only occurs when the initial theory is proven.
 Quoting: Balance242


I had no previous post. You mistook me for someone else. The nozzle is absolutely vital in the acceleration of the rocket.

I’m sensing here that you know these things already and are just trolling though.
 Quoting: MaxTork


So you are saying that in order for rockets to work in space, they need to be equipped with the de Laval nozzle, otherwise rockets not equipped with this nozzle will not work in space?
 Quoting: Balance242


A nozzle is not required, but highly suggested. What a nozzle does is focus the gas in one direction.

If you just had a hole in a piece of metal with pressure escaping, you would have a wide arc of gases escaping. Gases that escape at a higher angle produce less thrust in the direction you would like to go. These gases escaping at a high angle waste most of their energy by simply counteracting the force of gases escaping in the opposite direction.

A nozzle focuses this wide arc into a smaller arc, producing more thrust in the desired direction.
 Quoting: ParadoxicalExistence

So your argument is irrelevant to the pipe experiment. All you said was is nozzle helps, but it is not required.
 
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