Gyrvalcon

I found these pictures while browsing a popular imageboard. I don't usually post ephemera like this, but I though some folks might get a kick out of it; it sure does look like the NERF Vulcan, doesn't it? Apparently it's a M249 SAW with a 37mm grenade launcher and some obvious cosmetic modifications. It was a one-off for SHOT 2008, as the story goes.

I bought a Nerf Hornet from one of the guys at Massacre, and to my chagrin it's not doing so hot.

My diagnoses:

One of the blast chambers/quick exhaust valves is leaking. This keeps the internal pressure of the whole gun low, so that it can fire, but doesn't get much range. If I can't fix the valveon the bad blast chamber (doubt it), is my only option to amputate/plug the faulty blast chamber?

I'm not including pics just because there's nothing visibly wrong with it, I'm just looking for a second opinion.

Breaching a secondary or sidearm is, generally speaking, incredibly impractical for use in a nerf war.

And with that in mind, this is my Nightfinder with a fixed magazine. Credit to Ompa and Boltsniper for the basics of the breech design.





It uses a 10 dart fixed magazine made of polycarbonate and a nested brass breech. The only other modification, aside from the breech, is a spring replacement, using a section of AR-15 spring. Ranges are 40'-45'

After cocking, the breech is actuated with the upper handle. The section of 17/32" brass slides into the plunger tube, allowing a dart to pop in. Close the breech, and it's ready to fire. Note: Currently the magazine is taped on. I'm going to need to add some hardpoints to attach it to the shell with.

A close up of the internals:




Questions and comments are welcome.

I've been in the early stages of making my first compressed air homemade for too long now, and I approach NH with questions and a sense of apprehension. I'll start with what I have: vague plans and failed attempts.

The Vague Plan:

A valve inspired by Dr. Nerf and his valve and CaptainSlug's A.B.P.



I had first hoped that the barrel's back-and-forth motion would correspond directly with the trigger pull and return. Unfortunately, my first iteration proved that this would require a trigger pull of several inches: the dart length + dead space between dart and valve + valve travel.

Which brings me to...

The Failed Attempt:

My first iteration went undocumented, as I abandoned the project after hitting some problems. I can, however, give a description and illustration.



1.
-The "Outer Barrel" is the long beige rectangle, with the right angle at the end, made of 3/4" CPVC
-The "Reservoir" is the grey rectangle, made of 1" PVC
-The "Connection" between the Outer Barrel and Reservoir is 1/4" Vinyl Tubing
The "Valve" is the more complex part, descibed further in (2.)

2.
-The Valve consists of two O-Rings on a section of Threaded Rod, spaced by 1/2" CPVC and kept in place by two Nuts that have been ground down to fit inside the Outer Barrel.

This model failed because of bad seals between:
-The "Air Source" (not pictured) and the Outer Barrel
-The Reservoir and the Outer Barrel, at the Connection

Mistakes/Problems To Be Solved:
-I sealed the Connection with only hot glue, and expected it to be airtight.
-I didn't use a one-way valve between my Air Source (a hand pump) and the Outer Barrel.
-Where the Connection met the Outer Barrel, there was too much obstruction, keeping the Valve from sliding freely.


That should sum up what I've done so far. I've now been motivated to take another crack at it, but I'd like to run few ideas past the NIC. First, the Connection between the Outer Barrel and Reservoir. The "two crappy bits of tube and hot glue" approach was a bad one. Hot glue isn't durable, so I got some PVC cement, which means no more vinyl tubing. I need a Reservoir and Connection that's airtight and makes no protrusion into the Outer Barrel, so as to keep the Valve's movement unimpeded, yet allow maximum airflow when open. Second, I've realized I need a one way valve between the Air Supply and the Outer Barrel, as the pump isn't enough to hold back the pressure needed. I bought a couple Schraeder valves, but I need to find the best way to mount them. The valves are encased in rubber... and I kind of lost the little documentation they came with...has anyone used these before?

The Schraeder Valve:


The last problem, one which I haven't played with yet, is the best way to trigger the valve. If plain trigger pull is insufficient, then there needs to be a different way to cycle the action. I, of course, am leaning towards lever action. I'm shying away from a pneumatic ram (like in the A.B.P.) due to complexity issues. Ideas?

I hope I've explained the situation perspicuously, If you have questions, ask away.

A friend of mine has written his own encryption program in Java, and wants to test out how it holds up against attempts to crack it. He's offering a CAD $50 (~US $43) , paid over Paypal, to the first person who can decrypt the following code.
He's in highschool, gearing up for a University programming course, and is trying to learn a programming language to start him off.
His contact information and instructions are encrypted in the following message.

59 114 41 121 69 185 170 250 65 248 181 186 189 152 159 136 134 250 252 132 150 243 159 9 240 103 196 184 50 158 124 240 94 201 187 47 204 207 132 116 233 137 77 195 160 4 243 85 57 217 170 32 192 129 114 213 69 59 160 21 253 111 12 15 195 178 83 35 145 1 251 93 125 209 185 39 154 71 186 14 243 98 198 230 167 22 54 251 101 202 179 28 60 144 0 32 235 80 53
167 11 249 119 231 88 193 176 35 227 152 126 230 86 193 243 164 10 42 253 107 223 68 100 59 172 19 249 99 198 156 188 222 37 109 171 25 133 247 104 217 85 191 46 157 189 226 2 77 184 25 133 232 85 178 220 2 20 30 103 214 65 171 23 124 157 9 113 223 255 100 202 43 157 1 53 85 191 45 137 253 106 215 60 92 201 49 159 191 26 138 246 83 115 158 233 36 98 152
254 25 75 185 17 6 117 225 84 129 193 241 34 75 130 188 225 92 152 246 83 198 34 145 204 4 54 80 112 210 64 173 205 57 167 11 127 152 13 171 72 16 131 123 27 240 96 213 245 185 39 139 171 113 229 151 133 170 86 197 180 97 85 41 146 127 235 139 85 62 222 167 14 46 135 119 232 136 90 59 165 11 242 84 56 216 172 28 60 134 108 222 67 99 55 159 1 33 241
87 202 185 49 160 23 251 155 109 224 74 46 206 162 18 50 247 102 197 187 49 161 26 58 142 119 220 80 112 196 169 38 154 71 186 120 234 79 111 52 158 190 18 253 169 157 118 219 113 230 6 107 209 241 109 214 51 83 204 45 153 20 140 243 109 202 234 75 186 38 70 175 30 150 182 47 159 20 52 147 2 127 238 74 106 220 14 2 20 30 109 220 63 165 197 62 174 27 59
160 23 55 172 20 125 233 29 61 135 167 30 128 244 88 120 244 81 192 44 76 104 166 214 246 98 210 242 107 219 80 195 227 72 190 31 129 245 21 118 211 63 170 23 131 254 30 139 243 109 221 74 178 26 58 139 244 81 33 134 115 29 19 56 162 67 24 139 125 29 225 81 195 234 183 84 28 253 116 217 249 169 15 132 85 58 166 83 71 22 132 164 2 237 103 213 245 165 11
128 81 54 162 67 0 231 75 58 175 30 146 178 120 239 143 94 201 189 98 46 151 6 237 87 59 219 175 31 63 148 4 249 108 12 209 67 32 137 122 26 219 191 32 150 120 239 99 15 3 214 187 44 204 149 14 46 131 112 16 214 187 34 141 0 229 20 142 253 16 29 122 232 73 179 39 71 181 18 70 102 193 46 138 235 96 220 57 89 214 62 160 19 51 165 16 48 173 21
114 147 2 112 229 94 126 246 87 201 233 50 89 207 239 102 200 60 161 10 120 224 0 124 236 12 124 222 87 119 217 85 123 164 229 73 197 52 88 120 239 94 203 3 235 103 200 41 166 198 15 47 167 8 124 225 1 112 231 75 205 237 93 191 48 80 205 53 147 179 249 66 157 232 68 133 90 63 173 33 144 3 35 250 99 210 242 177 36 133 105 212 72 104 60 164 14 46 237
93 193 170 87 75 17 138 126 242 146 88 202 234 169 15 130 100 4 45 205 146 118 213 67 39 136 123 239 77 57 165 35 195 136 123 222 75 60 160 10 238 142 98 205 190 32 192 138 124 238 83 48 157 7 241 106 203 183 84 30 138 104 227 131 73 59 219 164 34 194 131 108 215 71 53 162 23 255 105 9 221 74 43 159 100 198 42 159 14 134 241 17 142 246 101 211 78 168 30
122 246 22 140 252 99 210 242 110 215 70 188 47 137 255 91 215 247 102 205 237 93 187 42 155 15 2 47 164 11 43 151 1 98 206 49 81 187 55 101 134 209 64 96 195 44 152 1 108 206 50 167 24 76 108 212 59 171 23 55 164 17 124 224 0 97 208 60 92 166 198 46 158 14 107 148 13 124 234 17 140 233 9 134 238 75 107 210 59 182 33 158 204 165 165 102 5 247 85
193 173 43 215 203 240 155 98 2 195 182 42 159 9 246 97 200 232 191 37 151 123 220 252 90 197 190 95 34 144 118 213 65 42 142 174 3 235 81 196 228 184 33 134 123 27 240 96 213 245 65 51 162 26 58 251 155 100 215 72 104 41 143 127 240 101 5 206 184 28 146 8 248 109 218 74 52 224 212 171 27 59 128 117 21 236 92 209 189 38 198 132 110 14 224 74 56 177 86
35 148 120 52 84 182 38 151 1 5 108 214 55 172 9 117 150 190 42 147 2 127 231 79 111 222 77 186 218 79 169 31 123 229 81 193 51 181 222 254 103 206 238 103 215 76 108 228 75 193 53 146 178 25 131 249 102 135 244 81 113 237 92 194 47 79 196 45 158 9 41 153 15 47 144 7 126 159 11 122 155 12 12 124 239 94 213 50 82 192 57 89 187 47 151 6 112 218 86
191 44 76 182 36 68 177 25 135 167 12 113 217 71 51 223 211 167 23 134 176 224 230 234 231 235 232 229 235 231 51 100 38 93 71

TL;DR : Numbers are actually letters, figure it out and get money.