Search found 194 matches
- Sun Apr 07, 2019 1:02 pm
- Forum: Pneumatic Cannons
- Topic: Balanced Hammer Valves
- Replies: 19
- Views: 18179
Re: Balanced Hammer Valves
These are cool, but can they be re-arranged to look more like the typical piston gun, where the porting is full-bore straight into the breach? I guess you'd need an awkward hammer that pulls, rather than pushes, the stem.
- Sun Mar 31, 2019 3:56 pm
- Forum: Pneumatic Cannons
- Topic: Supersonic peashooter
- Replies: 5
- Views: 4558
Supersonic peashooter
I'm thinking about ways to make a self-contained gun where the energy to fire it is delivered manually by pulling a more-or-less constant force across a moderate distance (3 feet). Supposing I can lift about 50lb, and suppose I can make the 'stacking curve' sufficiently flat that I deliver 80% of th...
- Wed Aug 31, 2016 7:30 am
- Forum: General How-To & Discussion
- Topic: Is spudding dead?
- Replies: 119
- Views: 255521
Re: Is spudding dead?
Hey guys! It's been ages since I logged on [edit: almost 4 years!]. I still keep my cannons at my parent's garage, but I've lived in apartments in the city for the last 6+ years, so I haven't been able to build anything new. I don't foresee that changing for a long time either, unfortunately. It's a...
- Mon Jul 22, 2013 11:15 pm
- Forum: Off-Topic Hobbies
- Topic: Combustion Water Bottle Rockets
- Replies: 33
- Views: 11257
I used to do this with oxygen and gasoline or acetylene, no water. I was crazy enough to put some lead fishing weights or washers on top, along with fins and a nosecone. I'd say I got 300+ feet, but that may be generous. No idea how high the weights (read: shrapnel) went when the bottle exploded, wh...
- Sat Jun 01, 2013 9:32 am
- Forum: SpudFiles Discussion
- Topic: SF is dying
- Replies: 71
- Views: 26326
I'm at school in the middle of a city, with a smallish apartment and no car. I don't have the space or the time right now to build anything. I'm sure I'll pick the hobby up again at some point in my life though. I'm consoling myself by building some water bottle rockets this summer. Oh, and when I v...
- Wed Jan 02, 2013 10:49 pm
- Forum: Hybrid Cannons
- Topic: Cartridge hybrid build log
- Replies: 22
- Views: 10950
Edit: I want to move this to the showcase. Should I start another thread or can a mod copy the thread over? It's a bit louder at 10x, but still nothing like a .22 rifle. Unfortunately the epoxy around the schrader valve cracked & there's a slight leak now in the cartridge. I'll have to rethink my de...
- Tue Jan 01, 2013 8:21 pm
- Forum: Hybrid Cannons
- Topic: Cartridge hybrid build log
- Replies: 22
- Views: 10950
I added the piezo trigger on the handle, you can see it in the video. The video shows the ignition system, the bolt action operation, and firing / damage. It's done at 5x. http://www.flickr.com/photos/57841472@N05/8336111558/ I had to reduce the burst disk thickness to one layer of paper & one layer...
- Mon Dec 31, 2012 3:25 pm
- Forum: Hybrid Cannons
- Topic: Cartridge hybrid build log
- Replies: 22
- Views: 10950
Happy New Year! I finally got some time this winter break to put together a bolt-action gun to accept the cartridge I built last year(!!) Here's the scoop: http://farm9.staticflickr.com/8493/8330256309_7d84d54f72_k.jpg http://farm9.staticflickr.com/8074/8330257287_2c28e51f63_k.jpg The bolt is a piec...
- Sat May 19, 2012 5:12 pm
- Forum: Pneumatic Cannons
- Topic: 400 PSI 150 FPE METAL 50 CAL. MUZZLELOADER QEV CANNON
- Replies: 18
- Views: 14986
- Sat Mar 17, 2012 11:21 pm
- Forum: Hybrid Cannons
- Topic: VERA: My very favorite gun
- Replies: 146
- Views: 65951
- Sun Jan 29, 2012 6:13 pm
- Forum: General How-To & Discussion
- Topic: I gotz a foundry!
- Replies: 13
- Views: 2943
I did this on a very small scale several years ago, and it was a lot of fun. I think my favorite part was when I melted a bunch of US pennies down with some copper, trying to make brass. I caught the zinc in the pennies on fire, it was a beautiful yellow-green color, mixed with the blue-green from t...
- Sat Oct 22, 2011 8:36 pm
- Forum: Pneumatic Cannons
- Topic: CBHV: Masterclass entry
- Replies: 251
- Views: 60389
- Sat Jul 23, 2011 11:49 am
- Forum: Pneumatic Cannons
- Topic: Open source pneumatic gun simulation
- Replies: 18
- Views: 7026
- Tue Apr 26, 2011 11:54 am
- Forum: Combustion Cannons
- Topic: Laser Ignition
- Replies: 15
- Views: 4690
Sounds to me like a diode-pumped system to me -- maybe with a Q-switch or a Pockell's cell to create the short pulse width. No way any flash-lamp system is going to survive in an automobile. And I'm right: http://www.kigre.com/files/nd41.pdf . Looks like they might be heading away from Nd:YAG, thoug...
- Sun Apr 17, 2011 8:40 pm
- Forum: Hybrid Cannons
- Topic: mini hybrid win!
- Replies: 419
- Views: 87130