Search found 42 matches
- Sat Mar 28, 2009 12:08 pm
- Forum: Combustion Cannons
- Topic: Homemade Hydrogen
- Replies: 23
- Views: 6415
Edit: I am not quite sure about the chemical formula you gave do you mean 2Na+3Al+O3 Or Na2Al3O3 Latter does not exist and the first seems very unlikely.... According to Wikipedia, and we know Wikipedia knows everything, that's precisely what happens. The product is --> 2(Na3 Al O3) http://en.wikip...
- Sat Mar 28, 2009 11:42 am
- Forum: Combustion Cannons
- Topic: Homemade Hydrogen
- Replies: 23
- Views: 6415
I thought Aluminum reacted with BOTH HCL and NaOH/KOH to create hydrogen as follows: Aluminum w/ NaOH: 2Al + 6NaOH → 3H2 + 2Na3AlO3 Aluminum w/ HCl 2Al + 6HCl → 2AlCl3 + 3H2 Anyhow, as mentioned before, electrolysis is probably the cheapest way. If speed of gas creation is important, however, the ab...
- Fri Mar 27, 2009 4:44 pm
- Forum: Pneumatic Cannons
- Topic: The Sprinkler Valve (PDF File)
- Replies: 128
- Views: 156678
- Fri Mar 27, 2009 11:43 am
- Forum: Pneumatic Cannons
- Topic: The Sprinkler Valve (PDF File)
- Replies: 128
- Views: 156678
- Mon Mar 02, 2009 7:42 pm
- Forum: Off-Topic Hobbies
- Topic: finding vacuum equivilant pressure- Nuclear fusion
- Replies: 16
- Views: 4384
You are really going to attempt fusion in a plastic vessel? Won't hot plasma be involved in some way? Wouldn't stainless steel be better, maybe with a heat treated quartz view port? I don't think you will want to be looking at it anyway, if you are successful...flying neutrons...ya know. I think you...
- Sat Feb 28, 2009 12:22 pm
- Forum: Hybrid Cannons
- Topic: HGDT ??? Can someone help me install it. Having problems
- Replies: 8
- Views: 2386
1) Download COMDLG32.OCX (right click the link and save to your Desktop) --> http://www.ascentive.com/support/new/images/lib/COMDLG32.OCX 2) Back up your current copy of COMDLG32.OCX (if one exists) and copy the file that you just downloaded to the c:\windows\system32 directory. 3) In order for this...
- Thu Feb 05, 2009 9:44 am
- Forum: Combustion Cannons
- Topic: Hair spray
- Replies: 14
- Views: 6096
If metering propane isn't your thing. You can buy a propane torch, and attach it to your gun. Hold the button half way down to fill the chamber, and push down fully to ignite it. Its cheap-ish and easy, when I did it my chamber never got over fueled. This thread has a couple of examples of propane ...
- Sun Jan 25, 2009 11:26 am
- Forum: Pneumatic Cannons
- Topic: Semi-Auto Pneumatic
- Replies: 9
- Views: 2555
- Sun Jan 25, 2009 5:01 am
- Forum: Pneumatic Cannons
- Topic: Semi-Auto Pneumatic
- Replies: 9
- Views: 2555
Revised Design
I made a new drawing to clarify the operation and incorporated some of your advice. I still don't think a spring is necessary in front of the piston since it will be very close to bottomed out just before the valve pops. I did put in a cushion however.
- Fri Jan 23, 2009 5:58 pm
- Forum: Pneumatic Cannons
- Topic: Semi-Auto Pneumatic
- Replies: 9
- Views: 2555
The valve follows the barrel forward with the piston. The valve bottoms out just before the piston closes the forward air space. After the seal is broken, spring force pulls the valve back to it's seated position. This should be a very fast opening valve. When the air switch is released, the forward...
- Fri Jan 23, 2009 3:48 pm
- Forum: Pneumatic Cannons
- Topic: Semi-Auto Pneumatic
- Replies: 9
- Views: 2555
Semi-Auto Pneumatic
I was looking for thoughts, criticisms and improvements for the following design before I build it. Thanks for your input!
- Sun Jan 11, 2009 6:50 pm
- Forum: Pneumatic Cannons
- Topic: large volume pilot valve....CHEAP!!!
- Replies: 19
- Views: 5247
Though I think that the greatest effect is the air having friction with the barrel wall. Air doesnt like to go mach 1 or greater relative to its environment . The air in the center of the barrel can go beyond mach 1 without much trouble. That's not really true. Ask your self what a shock wave is an...
- Sun Jan 11, 2009 4:13 pm
- Forum: General How-To & Discussion
- Topic: Need help understanding recoil force
- Replies: 13
- Views: 3568
The recoil is the direct result of the projectile's ACCELERATION. This is one of Netwon's basic laws --> F=MA (Force=Mass X Acceleration). This in combination with Newton's principle --> For every action there is an equal and opposite reaction. Thus, the more pressure you have pushing the projectile...
- Sat Jan 10, 2009 1:25 pm
- Forum: Pneumatic Cannons
- Topic: large volume pilot valve....CHEAP!!!
- Replies: 19
- Views: 5247
And my question is how much does that affect acceleration??? Well, that would be a function of the speed of the projectile. In a normal barrel, as the projectile speeds up, the air in front of the projectile compresses more and more until the point where the projectile is nearing the speed of sound...
- Sat Jan 10, 2009 12:58 pm
- Forum: Pneumatic Cannons
- Topic: large volume pilot valve....CHEAP!!!
- Replies: 19
- Views: 5247
I'm just trying to figure out WTF "vacuum assist" is. I'm pretty sure there are greater things than just the additional pressure diff. effecting the projectile, I just can't wrap my head around it totally yet(I don't work for NASA..LOL)... The added benefit is that you have no air resistance ahead ...