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That isn't neccessary, when properly glued it can hold a lot of pressure. Putting bolts in will only weaken the PVC.
"ñøw mÿ šįg šüçkś!"
RJB, believe me, DYI is to be feared. I've been in discussion with him on alternate propellant systems, and what's in the reach of most is quite suprising.
MrC, the concept DYI and I have been discussing, you'd better be afraid. He's working through me.
I'm sorry, but having closely followed nearly every cannon DYI has built over the years, I just find it comical that someone with zero demonstrated experience in this field is unknowingly issuing a challenge to one of the most experienced and knowledgeable members of this site.
Set your system up to measure, inject, vapourize, and effectively diffuse a stoichiometric quantity of liquid nitromethane, and I may be slightly impressed.
People should not be afraid of their governments. Governments should be afraid of their people.
I think it's pretty obvious at this point that RJB INDUSTRIES is trolling, but I'll reply anyway.
DYI's aluminum/h2o gun uses enough electricity to kill you 750 times over in each shot. It creates peak pressures well in excess of the tensile strength of the chamber material. (not the burst pressure, but the yield strength of the material) It is held together by inertia. He designed a PLASTIC insulator that can contain this pressure without extruding itself. Earlier designs extruded the plastic thorough a metal hole.
If you can shoot a .12g airsoft BB through a steel coin, your arrogance may be forgiven by this forum.
Simply filling the chamber will do the job fine. No additional oxizider is needed. Power will be impressive too.
my arrogance?? What a f...??? Are you sleeping?? Read how they talk to me... Ok ? I see you like a baby with your papa "DYI"... Be a man, talk nice....
RJB case you DIDN´T see this, take a look
RJB came here to talk about a design which he thought was good and it was certainly no worse than some of the crap that's proposed here from time to time. The conversation deteriorated to subtle jabs immediately after his first post. He didn't know DIY or his qualifications....so what! Quit acting like a pack of Rabid Hyenas and give him a chance to fit in.
All right, arrogance may have been a strong word.
A quick search for DYI's posts would have shown his qualifications quite plainly. I think it is reasonable to do a basic search like that before saying what he said.
His idea was reasonable, and he was gently shown why it is not necessarily worthwhile. He was shown how he would only shrink the chamber by 20%, and that the addition of an actual liquid fuel injection.
DYI then gently explained that yes, fans help (and why), conceded that there could be advantages to using gasoline. He responded with a blatant challenge. I think Fnord's post on page 4 summarizes how all the experienced members felt.
He responded to aggression/frustration with more aggression. that is essentially what we have done, except we used facts to argue. It's not right, but its better.
Re-reading the thread, I take back my first line. You could be arrogant, naive or both.
Thanks velocity 3x... Please take a look on this, all of you... my vortex is the only picture i have in this computer of my BBMG...
http://www.spudfiles.com/forums/vortex- ... rt,15.html
I didn t know how to see what DYI did...so what...
Please check it and change the way of this conversation....
Reading this makes me think rule #1 got bent somewhat.
RJB, you are getting dissed because your original post looked like it was writen by an idiot.
Even allowing for English not being your first language it comes across as idiotic. People tend to not respect idiots.
A "liquid fuel" is a brilliant idea? Give me a break. Been there done that. Works fine but is not really any better than a gaseous fuel, indeed it is more difficult and gives no real advantage. That is engineering speak for "it is a stupid idea if your goal is better performance".
The controlling characteristics of the energy in a combustion chamber is not the fuel. The actual choice of fuel has a fairly minor affect. The controlling variable is the amount of oxidizer. If you don't increase the amount of oxidizer then the energy in the chamber is basically the same regardless of the fuel. The heat of combustion of gasoline is basically identical to propane. The amount of air in the chamber for a gasoline fueled vs. propane fueled chamber is basically the same (4% of the chamber volume as injected gaseous propane is insignificant). Put those two concepts together, work out the combustion stoichiometry then look up the low heat values for combustion of various hydrocarbon fuels and you'll discover the fuel (butane, propane, hexane, gasoline, ...) has basically zero affect on the energy in the chamber.
With that I think we've pretty well demolished his original idea.
RJB, you can build it if you want, no one is stopping you, but it probably won't be revolutionary. Even if you only want a smaller fuel tank, you can make a custom propane cylinder from some off-the-self fittings.
If it was my call I'd say lets just throw this whole discussion out and give him a chance to start over.
RJB, How bout you get that vortex gun together and show us some shredded targets, mmkay? The block itself looks very well-crafted so I look forward to seeing what the rest will look like.
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