Search found 1297 matches
- Tue Mar 13, 2012 9:16 pm
- Forum: General How-To & Discussion
- Topic: Is your spud gun visible from space?
- Replies: 32
- Views: 8600
- Mon Jan 16, 2012 3:55 am
- Forum: Miniature Guns
- Topic: Is this safe while using butane based aerosol?
- Replies: 12
- Views: 6994
- Sun Jan 15, 2012 10:08 pm
- Forum: Miniature Guns
- Topic: Is this safe while using butane based aerosol?
- Replies: 12
- Views: 6994
Well... No. That is rough as guts, and not really safe at all. Soda bottles are even better than what you're using, as they are designed for pressurized, carbonated drinks. The bottle you're using isn't. On the other hand, it's a very small cannon. It isn't very energetic and thus any failure will b...
- Wed Jan 11, 2012 5:00 am
- Forum: Pneumatic Cannons
- Topic: Fus Ro Dah Fail
- Replies: 10
- Views: 4087
I've built a few little vortex cannons before, and I think your problems are that the shape is incorrect on this scale, and you are using way too much air. One of the most effective ones I made was a long postal tube (maybe 50cm long and 10cm in diameter), with a hole drilled in the cap at the end (...
- Mon Dec 12, 2011 9:47 pm
- Forum: Off-Topic Hobbies
- Topic: Perhaps the coolest rocketry video I've ever seen...
- Replies: 42
- Views: 11269
- Mon Dec 12, 2011 7:58 pm
- Forum: Off-Topic Hobbies
- Topic: Perhaps the coolest rocketry video I've ever seen...
- Replies: 42
- Views: 11269
To get into orbit, it has to be travelling a LOT faster. So far, to my knowledge this has only ever been achieved with multi-stage rockets, where excess weight can be shed as the fuel is used up allowing the last stages to reach extremely high velocity. There's never been a successful single-stage-t...
- Tue Dec 06, 2011 7:08 pm
- Forum: General How-To & Discussion
- Topic: What type of cannon launches objects the farthest?
- Replies: 66
- Views: 13598
Exactly as SB15 says. Though, for a given bore and projectile, the obvious answer is of course, the most powerful one. Hybrids tend to give rather higher energy densities than combustions or pneumatics, but that doesn't mean pneumatic X can't beat hybrid Y. All depends on the specifications on the s...
- Tue Dec 06, 2011 7:07 pm
- Forum: Ammo & Parts
- Topic: Carbon Fiber Barrels
- Replies: 63
- Views: 14415
Sleeving with something would only improve the strength of it, and make it a bit safer should a crack develop in the carbon fiber. However, it won't be necessary to sleeve it to prevent 'bending'. You bend carbon fiber, and it bends back. Bend it too far and (if it's a thin rod) it gives, suddenly b...
- Mon Nov 28, 2011 4:32 am
- Forum: Off-Topic Hobbies
- Topic: how much PSI can a 3 liter bottle hold
- Replies: 10
- Views: 8253
- Sun Nov 27, 2011 4:54 am
- Forum: General How-To & Discussion
- Topic: Asymmetrical muzzle brake as hop-up?
- Replies: 6
- Views: 3307
I get the feeling that the projectile is going to be exposed to the (perhaps minimal) rotational force so briefly that it would be unable to induce a significant rotation, let alone cancel any rotation the projectile may have imparted to it by its contact with the barrel. I think to get reasonable s...
- Mon Nov 14, 2011 8:57 pm
- Forum: Pneumatic Cannons
- Topic: Do-it-yourself hydro testing?
- Replies: 30
- Views: 7094
@Tech, For small-ish launchers with chambers of maybe a litre or two capacity... I don't see the harm in hydro-testing by filling with water and adding a small amount of air. Sure, it's not as safe as the purely liquid method, but the amount of air we are talking is quite small provided all bubbles ...
- Wed Oct 26, 2011 2:20 am
- Forum: Pneumatic Cannons
- Topic: [Question] How far would a marshmallow go..?
- Replies: 22
- Views: 7348
- Wed Oct 26, 2011 12:30 am
- Forum: Off-Topic Hobbies
- Topic: The Official High-Speed Camera Thread
- Replies: 725
- Views: 184937
- Mon Oct 24, 2011 2:27 am
- Forum: Ammo & Parts
- Topic: personal computers in a machining environment
- Replies: 69
- Views: 16326
Surely you could fashion a few lugs onto the PC case to suspend it mid-air... Word on the street is that you already have most of the fixtures.
I really must start contributing to this forum and not simply using it as a way to siphon off excess smartassery...

I really must start contributing to this forum and not simply using it as a way to siphon off excess smartassery...
- Mon Oct 24, 2011 2:08 am
- Forum: Off-Topic Hobbies
- Topic: The Official High-Speed Camera Thread
- Replies: 725
- Views: 184937