"John Husvar" wrote in message
...
In article oxZcg.1087$No1.766@attbi_s71,
"Dave Lyon" wrote:


What does the assembly weigh and what is the burst pressure? If the
burst pressure is 300 psi and the disk is one inch in diameter, the
thrust at the moment of burst will be (Pi (0.5)^2)(300)= (0.785)(300)=
236 pounds. The impulse (integrated thrust) will be proportional to
tank volume.

Anyway, this thrust is enough to make most compressors move.

Joe Gwinn

Wouldn't that thrust assume you were pushing against a stationary
object?
Would it decrease relative to the distance the "hole" was to the floor
(or
wall)?

Not quite, the jet stream of pressurized air needs nothing to press
against. Its thrust is independent of anything but the pressure
relationships in the vessel and the nozzle, in this case the tank and
hole. It'd have as much thrust with a vacuum surrounding it. 'tis how
rockets work.

Swoosh!


If there is no benefit from being near the ground for our air compressor
rocket, then why do airplanes and hover crafts have a benefit from ground
effect?

I'm not trying to be a butt, just trying to learn something.