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  #11  
Old 02-07-2017, 05:15 PM
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Water ?

Why would you use that ?

Light hydrocarbons would be much nicer.....
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  #12  
Old 02-07-2017, 05:39 PM
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I did a lot of this in school. I would safely not go past 100 psi, and a good starting point on water level is 1/3 full.

We consistently got them to rupture at 130 psi.

Great fun and good luck!
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  #13  
Old 02-07-2017, 06:10 PM
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I worked with a guy that used to put some chunks of dry ice into a two liter bottle that had a small amount of water in the bottom. Put the cap on, give it a shake and toss it. The resulting boom was louder than your typical M80. Couldn't tell you the pressure though.
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  #14  
Old 02-07-2017, 07:55 PM
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Quote:
Originally Posted by MotorDoctor View Post
I worked with a guy that used to put some chunks of dry ice into a two liter bottle that had a small amount of water in the bottom. Put the cap on, give it a shake and toss it. The resulting boom was louder than your typical M80. Couldn't tell you the pressure though.


Did that working night stock at a grocery store! They used to put dry ice on top of the frozen food pallets to keep them cool on the three hour drive from the warehouse, on the unrefridgerated semi trailer. The chunks of dry ice acted like good hockey pucks for a quick game of hockey down the aisles too.
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  #15  
Old 02-07-2017, 10:59 PM
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Originally Posted by digger doug View Post
Water ?

Why would you use that ?

Light hydrocarbons would be much nicer.....
Seems you might be on to something...

https://www.youtube.com/watch?annota...&v=4vb2zsNJSQs
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  #16  
Old 02-07-2017, 11:34 PM
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Originally Posted by Windy_Acres View Post

What about re-purposing an SCBA tank ? I was thinking there where some 4500psi-ish models ? Im working from poor memory...
They do make 4500 psi models and that's likely what we'll get next. Our current bottles are 2216 psi, and it'll be a couple years before they need to be replaced.

I wonder what a safe working pressure is on your standard ABC extinguisher? Finch? Those are pretty commonly available.
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  #17  
Old 02-08-2017, 02:37 AM
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Originally Posted by JBFab View Post
They do make 4500 psi models and that's likely what we'll get next. Our current bottles are 2216 psi, and it'll be a couple years before they need to be replaced.

I wonder what a safe working pressure is on your standard ABC extinguisher? Finch? Those are pretty commonly available.
Co2 propelled fire bottles will be, at the max, 1800psi. Most times, most days you would be lookin at 800 to 1K, depends on how hot it gets.
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  #18  
Old 02-08-2017, 09:09 AM
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Quote:
Originally Posted by JBFab View Post
They do make 4500 psi models and that's likely what we'll get next. Our current bottles are 2216 psi, and it'll be a couple years before they need to be replaced.

I wonder what a safe working pressure is on your standard ABC extinguisher? Finch? Those are pretty commonly available.
Our stored pressure ABC (Dry chemical, not CO2) units are pressurized at ~125 psi.

I am starting to wonder where this thread has morphed to? I thought we were keeping it simple and safe for kids, and now we are looking at heavier metal projectiles fueled by hydrocarbons?
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  #19  
Old 02-08-2017, 10:17 AM
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Originally Posted by weldor2005 View Post

Our stored pressure ABC (Dry chemical, not CO2) units are pressurized at ~125 psi.

I am starting to wonder where this thread has morphed to? I thought we were keeping it simple and safe for kids, and now we are looking at heavier metal projectiles fueled by hydrocarbons?
Ya know, your absolutely right. My apologies to gimpyrobb for dragging this thread off the rails...
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  #20  
Old 02-08-2017, 03:20 PM
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I tried to d oa water bottle rocket today but the water refused to leave at -17f
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