Old 10-03-2011, 11:14 PM #1
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Default Jet Boots / PSI

Hello,
Quick Question.
My friend has at his disposal a ShoeBoxCompressor for up to 4500psi (pounds square inch). I was wondering if it would be possible to get some paintball/scuba tanks on each foot to propel you slightly in the air. If this would be possible what size would the tank need to be to lift a 118lb man from the floor.
This is probably a silly question but a fun idea none the less.
Thanks,
>>>>>__________________________<<<<
In terms of a sort of cannon:
Can someone help me do the math, If I had 68ci tank at 4500 psi what would be the force exerted if the valve is fully open. Im not sure what the size of the opening is however. Is there any equasions I can use?

And just so that I know; would the force exterted from a 4500psi tank only be 150% more power than a 3000psi tank or does it have expedentual properties?

Also If I had two 3000psi tanks connected to the same pipe would that exert 6000psi?

If anyone knows another forum better suited to this situation please point it my way.



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Old 10-03-2011, 11:51 PM #2
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Default Re: Jet Boots / PSI

There is so much that goes into what you are trying to do its unbelievable.
Its very dangerous , very , very dangerous from beginning to end, for instance, introduce any type of oil into a compressed oxogen tank = organic bomb.

No way to regulate something like that either, i could type for hours.

At the end of the day, dont fool with it, unless you want your 15 minutes of fame to be listed under the Darwin awards.
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Old 10-04-2011, 12:14 AM #3
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Default Re: Jet Boots / PSI

Yeah, I was only talking theoretically, if I was really going to carry it out I would need an oil trap and various other utensils I suppose. Besides, 4500psi bottles cost like $600 each...
But if we were talking numbers is it possible? I cannot be right in saying 1 square inch consists of 4500 pounds of potential thrust?
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Old 10-04-2011, 12:18 AM #4
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Default Re: Jet Boots / PSI

Without going into to much detail i can tell you this.

A 150 lb nitrogen cylinder at 1500 psi, held under water , having the valve sheared off with a sledge hammer will cross the Ohio river at 200 yards across.



Dont fool with it, make a potato cannon instead
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Old 10-04-2011, 12:20 AM #5
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Default Re: Jet Boots / PSI

I already have, Heh. But come to think of it I wonder how much pressure is created momentarily in the combustion chamber? Just so I have some Reference. 100-150(psi)?

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Old 10-04-2011, 03:28 AM #6
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Default Re: Jet Boots / PSI

Quote:
Originally Posted by Somedude View Post
Without going into to much detail i can tell you this.

A 150 lb nitrogen cylinder at 1500 psi, held under water , having the valve sheared off with a sledge hammer will cross the Ohio river at 200 yards across.



Dont fool with it, make a potato cannon instead
A 5-foot tall Carbon Dioxide at ??00 psi, laid into a properly constructed launch ramp, having the valve sheared off with a sledge hammer will fly a good 200 yards too...
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Old 10-04-2011, 06:09 AM #7
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Exclamation Re: Jet Boots / PSI

Quote:
Originally Posted by Cuddly Ninja View Post
Hello,
Quick Question.
My friend has at his disposal a ShoeBoxCompressor for up to 4500psi (pounds square inch). I was wondering if it would be possible to get some paintball/scuba tanks on each foot to propel you slightly in the air. If this would be possible what size would the tank need to be to lift a 118lb man from the floor.
This is probably a silly question but a fun idea none the less.
Thanks,
Simply put, this simply is NOT a good idea. Defiantly not fun. 4500psi tank has enough power to do some incredible damage when full loaded. Not to mention that there is a very good possibility of an explosion when fully discharging a tank like this. As the tank rapidly decreases in pressure it also rapidly drops in temperature. (-60c). Any moisture in the air becomes instant ice. An iced-up regulator (assuming you'll be using one) "can" cause an explosion. I have seen small tanks with enough force to blast themselves clean across a room and imbed themselves in a wall, sort of like an RPG does.
Pressurized tanks are not for playing strap-on suicide rocket ship with.
Here is a link explaining what an E style cylinder of 02 can do when improperly handled. Note, the O2 in this case was ~6500psi.
This exact accident can be duplicated with CO2 or N2.... etc.

http://www.youtube.com/watch?v=9lw_fhNAIQc
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Old 10-04-2011, 08:58 AM #8
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Default Re: Jet Boots / PSI

They already exist (google "jetpack" )

But is decisely better to NOT use them on a dusty ground, you see ?



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Old 10-04-2011, 07:32 PM #9
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Default Re: Jet Boots / PSI

This jet pack uses a decomposition reaction with 40% Hydrogen Peroxide to generate instant thrust. This is quite a different effect than letting loose a fully pressurized gas cylinder.
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Old 10-04-2011, 07:40 PM #10
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Default Re: Jet Boots / PSI

Iím guessing itís also a no to use one in conjunction with piping to make a large potat.... cannon. Gosh darn it, how long would it take a paintball tank to release all of its air?
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Old 10-04-2011, 07:56 PM #11
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Default Re: Jet Boots / PSI

The most I have played with is 1200 PSI of air.... and that will blow open your hand if you try and keep a tight fist around the opening of a air blower.

At this capacity (big 4500PSI tank) you are looking at much more damage than a short burst of 1200 PSI.

As others said... don't do this. But if you wanna make a potato cannon or paintball cannon or something of similar properties... make sure you used the right type of material. I personally would be looking into high pressure PVC... just in case there is an explosion... you won't have metal shrapnel coming at you.
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Old 10-05-2011, 05:07 AM #12
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Lightbulb Re: Jet Boots / PSI

Quote:
Originally Posted by bobhaha View Post
The most I have played with is 1200 PSI of air.... and that will blow open your hand if you try and keep a tight fist around the opening of a air blower.

At this capacity (big 4500PSI tank) you are looking at much more damage than a short burst of 1200 PSI.

As others said... don't do this. But if you wanna make a potato cannon or paintball cannon or something of similar properties... make sure you used the right type of material. I personally would be looking into high pressure PVC... just in case there is an explosion... you won't have metal shrapnel coming at you.
That's also a bad idea. Trying to block High Pressure air also can lead to serious injury or death. Air/any other gas under that much pressure has been known inject itself into the skin and end up in the bloodstream causing an air bubble embolism.

Pneumatic Potato cannons or enhanced potato cannons are able shoot at subsonic velocities and in some extreme cases can shoot up to 1000fps or "sonic". Shots are done on ~250-300psi. All pipe is either metal or really strong thick walled PVC/PVA.

TAC 6

Again, building one of these needs careful consideration. Safety is an absolute must.
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Old 10-05-2011, 05:55 AM #13
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Default Re: Jet Boots / PSI

Quote:
Originally Posted by Seoul_lasers View Post
Simply put, this simply is NOT a good idea. Defiantly not fun. 4500psi tank has enough power to do some incredible damage when full loaded. Not to mention that there is a very good possibility of an explosion when fully discharging a tank like this. As the tank rapidly decreases in pressure it also rapidly drops in temperature. (-60c). Any moisture in the air becomes instant ice. An iced-up regulator (assuming you'll be using one) "can" cause an explosion. I have seen small tanks with enough force to blast themselves clean across a room and imbed themselves in a wall, sort of like an RPG does.
Pressurized tanks are not for playing strap-on suicide rocket ship with.
Here is a link explaining what an E style cylinder of 02 can do when improperly handled. Note, the O2 in this case was ~6500psi.
This exact accident can be duplicated with CO2 or N2.... etc.

O2 CYLINDER EXPLOSION - YouTube

Where exactly did you come up with 6500 psi? those tanks usually don't go past 2250ish psi. Also, an incident like that with pure oxygen is different from air or co2 or n2 due to the fact that the tank and/or regulator along with anything around you burn nicely in pure oxygen.

Now, with that being said, anything over a couple HUNDRED psi is still very dangerous and can lead to very bad things form a flying out-of-control missile to air injected into a vein causing a pulmonary embolism.

Here is a good video to watch

Scuba Tank - Valve Cut - YouTube
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Old 10-05-2011, 07:19 AM #14
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Default Re: Jet Boots / PSI

Quote:
Originally Posted by Seoul_lasers View Post
That's also a bad idea. Trying to block High Pressure air also can lead to serious injury or death. Air/any other gas under that much pressure has been known inject itself into the skin and end up in the bloodstream causing an air bubble embolism.

Pneumatic Potato cannons or enhanced potato cannons are able shoot at subsonic velocities and in some extreme cases can shoot up to 1000fps or "sonic". Shots are done on ~250-300psi. All pipe is either metal or really strong thick walled PVC/PVA.

TAC 6

Again, building one of these needs careful consideration. Safety is an absolute must.
I know this now... I was young and stupid at the time

No damage done, but a wake up call to the power of compressed air!
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Old 10-05-2011, 10:20 AM #15
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Default Re: Jet Boots / PSI

Can someone help me do the math, If I had 68ci tank at 4500 psi what would be the force exerted if the valve is fully open. Im not sure what the size of the opening is however. Is there any equasions I can use?

And just so that I know; would the force exterted from a 4500psi tank only be 150% more power than a 3000psi tank or does it have expedentual properties?

If anyone knows another forum better suited to this situation please point it my way.

Thanks,

Last edited by Cuddly Ninja; 10-05-2011 at 10:32 AM.
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Old 10-06-2011, 12:58 AM #16
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Default Re: Jet Boots / PSI

Quote:
Originally Posted by Cuddly Ninja View Post
Can someone help me do the math, If I had 68ci tank at 4500 psi what would be the force exerted if the valve is fully open. Im not sure what the size of the opening is however. Is there any equasions I can use?

And just so that I know; would the force exterted from a 4500psi tank only be 150% more power than a 3000psi tank or does it have expedentual properties?

If anyone knows another forum better suited to this situation please point it my way.

Thanks,
Listen brother , i deal with high pressure things that go boom every single day, high pressure, high volume, explosive , poisonous , sub zero, extreme heat, machinery that at the minimum deals with 480 volts A/C to 1200 volts A/c, frequency drives, i bring entire hospitals up and down electrically and mechanically, and i wouldnt for one second even begin to attempt what you are talking about.
There is a vast gulf of knowledge that you havent even noticed or considered.
YOU ARE SCARING ME TO DEATH Please dont pursue this, it is almost a guaranteed trip to the hospital or worse.

Ive been doing this for 25 years and am at the top of my field, i give advise and train people every single day, im the person who gets sent in last after no one else can fix it, i know people in my trade across the U.S. and again, I wouldnt even attempt it, not for a second, i think i would rather play russian roulette .
At least try and version in miniture, then once you see the condition of the prototype after its first flight, you may change your mind.
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