Yes. And I see you have under 900. You have much to learn.
If you'd like, Im starting enrollment for wise-assery 101 in the near future. I'll put you down as a maybe?
Yes. And I see you have under 900. You have much to learn.
If you'd like, Im starting enrollment for wise-assery 101 in the near future. I'll put you down as a maybe?
Originally posted by: Yossarian
I recommend coating the entire bottle with the epoxy
I honestly thought about forming a barrier of concrete around it.
DrPizza
Administrator Elite Member Goat Whisperer
I repeat: bursting strength is typically between 150 and 200 psi. Glugglug is correct that above some certain pressure, the 2 liter bottle will slowly stretch and get thinner. Having pressurized many many 2 liter bottles at 100 psi (I use a pressure regulator for consistency in competitions among students), I haven't experienced any bursting 2 liter bottles. Of the numerous sites I've polled, 100 psi is about the highest regarded as safe.. many say 90 psi or less. However, I do *NOT* allow students to go near a pressurized bottle. And, I'm a little nervous whenever something goes wrong and a bottle doesn't release correctly (such as the string to the launch pin becoming disconnected)
DrPizza
Administrator Elite Member Goat Whisperer
Someone posted that video about 2 weeks ago in OT. I wish I could find it, I had it on my computer but deleted it lest my own sons get some ideas... Morons were mixing ammonia and alcohol in a bottle.
Other morons mix aluminum foil and drano. People like me used to fill the bottle 1/3 of the way with vinegar, then pinch the sides together so that when baking soda is poured in, it doesn't come into contact with the vinegar. Then cap, quickly shake, and throw.
I quit doing that the day the cap on a bottle ruptured when the bottle hit the ground... just right. The empty 1 liter bottle went over my shoulder (inches away) at a speed that would have sent me to the emergency room. I was fortunate to learn my lesson with a near miss. (since many in this thread seem familiar with paintball, imagine something moving about 3 times the speed of a paintball.) Video analysis of water rockets reveals that the 2 liter bottles accelerate in the neighborhood of 10,000 m/s^2 (about 100 times the acceleration of gravity)
they last pretty long i think. For the most part i think that they are recycled. when they get thrown away it is generally really serious problem with the tank since they are kinda expensive and it would be better to fix it.
You're gonna fill up a 2liter bottle with compressed air and let it rip into the engine nitrous-style?
-patchy
SociallyChallenged
Elite
- Mar 22, 2002
- 10,483
- 32
- 81
Having a tank of compressed air would come in handy for a short burst of power without the heat disadvantage of a supercharger or a turbocharger, and without the materials handling problems of nitrous oxide.
*cough* I just did a quick search and I may be able to get my hands on 3 old SCUBA bottle regionally, for free. Want to pay shipping + $10?
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