Tilted Forum Project Discussion Community  

Go Back   Tilted Forum Project Discussion Community > Interests > Tilted Weaponry


 
 
LinkBack Thread Tools
Old 10-18-2004, 01:13 AM   #1 (permalink)
Upright
 
Hydrogen powered spud gun - now with a video

I was wondering if anybody has already done this...?

Right now I am setting up to make a hydrogen powered spud gun. My hydrogen/oxygen production unit is nearing completion, loosely based off of this site:
http://www.fortunecity.com/greenfiel...6/hydrogen.htm

Using my cosmic power of solving PV=nRT and the specific heat/heat of formation of water, I have determined that the heat generated would handily melt PVC, and that output pressure should be about 8.35 times the input pressure of H2 + O2 mix. It goes without question that there is a good chance this gun will blow up.

In order to simulate the various conditions of a gun of this type, I plan on writing a java program that takes all sorts of things into account.

These things should be important:
Volume of chamber and barrel
C/W of PVC pipe
Wall thickness
Ambient temperature
Ammunition displacement versus time (implicit differentiation to come up with related rates of pressure vs temperature vs ammo position)
Mass, size, shape of ammunition
Air drag information on ammunition
Spark location
Flame front speed, temperature, and location

The idea here is to calculate peak pressure and temperature that the gun will be exposed to, and to calculate if the pipe will hold or explode.

Any thoughts? I'll be posting back here as I make progress.

EDIT:
Video of an exploding balloon using fuel made from my completed electrolysis unit. here

Last edited by kleptophobiac; 10-24-2004 at 05:31 AM..
kleptophobiac is offline  
Old 10-18-2004, 04:06 AM   #2 (permalink)
MSD
The sky calls to us ...
 
MSD's Avatar
 
Super Moderator
Location: CT
Just use 4% propane. It's a lot easier and a lot less likely to kill you.

Also, use ABS, not PVC. It'll crack instead of shattering and you'll be kicking yourself instead of riding in an ambulance.
MSD is offline  
Old 10-18-2004, 12:20 PM   #3 (permalink)
Insane
 
Location: On a gravel road rough enought to knock fillings out of teeth.
And, no matter what you use, put some sort of scatterblanket on it. It's a lot easier to open it and shake pieces out than to open you and pull them out.
__________________
Judge me all you want, but keep the verdict to yourself.
BoomTruck is offline  
Old 10-18-2004, 01:08 PM   #4 (permalink)
Upright
 
I was definitely planning on using PVC for this because of its cheapness and availability. I also have a large steel tube that the whole thing is going to slip inside of just in case of explosion. I also plan to have a wireless detonator so I can be way far away from the thing when it fires.

Safety first!

I used propane for a while, and while nicer than hairspray, it just doesn't have as much bang as I would've hoped. This hydrogen combustion/compression hybrid should be quite a bit of fun.

Also, progress on the electrolysis rig is good, I have acquired the mesh from a friend.

Here are the endcaps I have made thus far. This constitutes most of the work on the electrolysis setup.


Last edited by kleptophobiac; 10-18-2004 at 01:17 PM..
kleptophobiac is offline  
Old 10-18-2004, 01:36 PM   #5 (permalink)
Poo-tee-weet?
 
JStrider's Avatar
 
Location: The Woodlands, TX
looks cool... sounds like youve got things under control with the remote trigger and the metal shrapnel casing.... should take video of firing it for us...
__________________
-=JStrider=-

~Clatto Verata Nicto
JStrider is offline  
Old 10-18-2004, 03:39 PM   #6 (permalink)
Upright
 
Unfortunately, for video I only have a crappy old Intel webcam. It'll work, it just won't be very impressive, or have sound.

I'll definitely see if I can get my paws on a real camera. A friend of mine is a cameraman at one of the local TV stations, perhaps he can use his uber camera to film this.
kleptophobiac is offline  
Old 10-23-2004, 11:21 AM   #7 (permalink)
Upright
 
Well, the H2 O2 rig is almost done.... it works too, but I have a small leak in one chamber that I need to fix.

Also, a car battery charger is an excellent power supply for this purpose.
kleptophobiac is offline  
Old 10-23-2004, 08:16 PM   #8 (permalink)
Upright
 
Fixed one leak, now I found one more that only manifests itself at high pressure. It is between a fitting and a valve. More teflon is required.

Anyway, here's a test of a water balloon filled with hydrogen and oxygen:
http://home.insightbb.com/~kleptophobiac/H2.avi
kleptophobiac is offline  
Old 10-24-2004, 09:13 PM   #9 (permalink)
MSD
The sky calls to us ...
 
MSD's Avatar
 
Super Moderator
Location: CT
Has anyone else told you that you're fucking insane?
MSD is offline  
Old 10-25-2004, 11:46 AM   #10 (permalink)
Upright
 
Quote:
Originally Posted by MrSelfDestruct
Has anyone else told you that you're fucking insane?
Yes. Many times... but I'm still here, right?
kleptophobiac is offline  
Old 10-29-2004, 10:11 PM   #11 (permalink)
Psycho
 
Location: New Orleans
How's the rig coming?
__________________
"Everyone thinks of changing the world, but no one thinks of changing himself." -- Tolstoy
krazykemist is offline  
Old 10-30-2004, 08:51 AM   #12 (permalink)
Upright
 
I've had a setback with the hydrogen generator. I'm engineering a better solution now.

I forgot about the (aluminum shroud + steel eye) rivets in my setup, and I managed to destroy my anode (accelerated by the presence of an electric field) and turned it into a combination of aluminum chloride and aluminum powder. Whoopsie.

My next unit will be 100% copper/brass and should not corrode anywhere near as fast as my aluminum setup did.

As for the gun itself, I have procured a source of solenoids and fatter pipe. The gun won't be completed for at least a month or two due to time constraints. The hydrogen generator must also be in good working order before I can build a gun to use the fuel it makes.

Finally, I found my camcorder (from 1987) but it does not power on. I'll see if I can't breathe some life into it during my spare time.
kleptophobiac is offline  
 

Tags
gun, hydrogen, powered, spud


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 12:00 AM.

Tilted Forum Project

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
© 2002-2012 Tilted Forum Project

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360