Air Cannon School Project Firing Paper Projectile

1
0
Hey guys building an air cannon for class that shoots a wad of paper from a normal sheet of 8.5/11 paper will be dry. Question is... Is Psi more important or CFM with this light weight projectile?
Plan on building from PVC, can do 100psi easy.
Plan on using a diaphragm valve with a solenoid for fast opening.
What about using a plunger to compress the air like an air rifle?
Barrel will be around 18", 3/4 OD PVC
Sound good? Got any ideas? Love to hear your input :)
 
743
142
What you seem to be concerned with here is muzzle velocity. (I don't know how important accuracy or other considerations are.) Safety is always a consideration as well. (No high pressure plungers, they can explode and can be a fire hazard with paper dust.)

Pressure is only useful to get fluid (air) speed. Air volume is needed (at least for muzzle velocity) to accelerate the paper. So you need a balance. (Given the added effect a large volume of air might have in carrying the paper past the muzzle, you might want to err on the side of more volume than pressure.)

Another consideration is gun caliber.

So you might want to brush up on acceleration equations. Fluid dynamics would be a nice addition but may be beyond high school level. (I don't know it myself,as an electrical engineer.) But best of all would be to design a proper test plan to see what actually works. Run the tests, get numbers, and choose a final design. With foresight and good records this could serve as one or several science projects at a later date.

To make a science project you would need to start with an hypothesis. (Ex. "Tighter muzzle fit increases [or decreases] range variability in crumpled paper projectiles.") The foresight comes in designing the test plan to collect the data you would need. Who knows, you might even publish and win an Ig Noble Prize.
 

Related Threads for: Air Cannon School Project Firing Paper Projectile

  • Posted
Replies
6
Views
4K
Replies
5
Views
3K
  • Posted
Replies
2
Views
2K
  • Posted
Replies
6
Views
12K
  • Posted
Replies
2
Views
3K
Replies
11
Views
1K
Replies
3
Views
3K
Replies
1
Views
757

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving

Hot Threads

Top