Spudblaster:
Didn't you post a message with the mass of a spud cut in 2" versus 1.5" barrels? It also included an estimate of the sectional densities for the two rounds.

Heavymetalsarge: Sorry, didn't mean to rag on ya. The word you were looking for is "explode". An explosion can be a deflagration of detonation event. Someone on spudtech had a signature along the lines of; "an explosion can be defined as a loud noise followed by objects being rapidly displace from w...

Boilingleadbath: You are right of course. I assumed that the pressure was the same for both barrels (the always tricky "all other things being equal" approach). The pressure will drop faster with the big barrel so the acceleration will be less with the big barrel than the little one. And the drag th...

Don't know where the <a href="http://en.wikipedia.org/wiki/Heptane">Wiki</a> writer came up with " Heptane (also known as dipropyl methane, gettysolve-C or heptyl hydride) is an alkane with the chemical formula H3C(CH2)5CH3. " Heck, he goes on to say "heptane" is synonymous with "n-heptane" which is...

Of course the drawback of a combustion gun that has the barrel extending into the chamber is that it's performance will suck.

1. Too much heat loss from all that surface area in the combustion chamber.
2. Slow burn rate caused by the very small flame front area.

edit: fix bad engrish

...Arne't most rifle rounds designed for extreme ranges fairly large? Is it possble to build a 0.22 that has an affective range of a couple thousand yards? Not unless the round was made out of something denser then lead, it’s all about mass, the heavier the projectile the farther it will go. Wad up...

Jimmy101, you say: A smaller projectile will have a "faster projectile speed" but will not necessarily have greater range or more impact energy. but then go on to say: Since the two barrel give the same acceleration then the muzzle velocities are the same when the spud exits the barrel. Both statem...

Also, because of the extra frontal area of the 2" round, it will lose energy to drag at a greater rate than the 1.5" round after leaving the barrel. At a certain range, the non proportional rates of deceleration would mean that the smaller round would actually have more kinetic energy. Are you sure...

generally any flammable gaseous hydrocarbon with oxygen in the confines of a spud gun will detonate, the same should be with the presence of compressed oxygen should produce more efficient detonation thus louder bang and a farther spud launch. Damn... No, a flammable hydrocarbon with oxygen will no...

No, the smaller round will not do "more damage to the target". The smaller round will do more damage to a smaller area of the target. The total damage will be less with the smaller round. Case in point, an armor piercing round. An APR is designed to give maximum damage to the smallest possible area ...

...Not to mention the fact that given identical lengths, a 1.5" barrel will produce faster projectile speeds, more range, and more impact energy density (more damage) than a 2" barrel. I'm not sure all of those statements are correct. A smaller projectile will have a "faster projectile speed" but w...

Like Pcguy said, the store can refuse to sell you something if they feel like it. Sorry, but you do not have the "right" to buy anything, or at least, your "right" to buy does not overrule his "right" to not sell it to you. Besides, the guy is really just protecting the company. If you blow your han...

the problem is that the chamber is to small. a good rule of thumb in combustion style potato guns is that the chamber should be 1.5 times the volume of the barrel. I've always had good sucsess with it, getting at least 300 yards or more every single shot. Actually, a good rule of thumb is that the ...

Boiling: CD quality audio is recorded at 44.1 KHz so it is unlikely that your sound card samples at 96 KHz. But, like you said, it doesn't really matter, 44.1 KHz, 22 KHz, 10 KHz, are all fast enough. You wouldn't have access to a good recorder would you? A digital recorder in particular is more tha...

Boiling: Sounds like a great idea. Of course, it is a method to get "Latke type C:B data" quickly and does not directly address the issue of "is the chamber too large or the barrel too small". I believe that can only be answered with a constant barrel and a variable chamber. Your proposed approach w...