Vacuum bazooka

Short description: Pipe-based cannon

A vacuum bazooka is a pipe-based cannon which uses a vacuum pump (often a vacuum cleaner) to reduce pressure in front of the projectile and therefore propel a projectile as a result of the air pressure acting on its reverse. The concept was originally proposed by Neil A Downie in 2001[1] but many variations have been built since.[2][3]

## Contents

* 1 Construction
* 2 Variations
* 3 See also
* 4 References
* 5 External links

## Construction

Vacuum cannon photo diagram

The vacuum bazooka uses a straight tube which is sealed with a type of 2 - 4 layers of aluminum foil at the muzzle and by the projectile at the breech. A tee-piece near the muzzle allows application of vacuum. When the projectile is released the air pressure behind the projectile causes it to accelerate towards the vacuum port. When the projectile reaches the vacuum port its momentum causes it to continue past and break through the bursting disk towards the target.[1] A lightweight bursting disk such as a piece of paper can be secured simply by the vacuum action when it is held against the barrel.

The maximum velocity the projectile reaches is about 650 mph (1,050 km/h).[citation needed]

The velocity of a projectile in a vacuum cannon can be modeled. The maximum velocity is independent of the projectile mass and barrel diameter. In this model, the maximum velocity is lower than the speed of sound (about 343 m/s (1,130 ft/s; 770 mph; 1,230 km/h)).[4]

## Variations

Several variations have been developed including a belt fed[3] repeating model.

## See also

* Spud gun
* Plastic pressure pipe systems

## References

1. ↑ 1.0 1.1 Downie, Neil A. (2001). Vacuum Bazookas, Electric Rainbow Jelly and 27 Other Saturday Science Projects. Princeton University Press. pp. 70–79.
2. ↑ "Vacuum Powered Bazooka". The Naked Scientists. 2008-03-16. http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/vacuum-powered-bazooka/.
3. ↑ 3.0 3.1 Ansell, Dave (2011-09-23). "Repeating Vacuum Bazookas". The Naked Scientists. http://www.daveansell.co.uk/?q=node/65.
4. ↑ Ayars, E.; Buchholtz, L. (2004). "Analysis of the vacuum cannon". American Journal of Physics 72 (7): 961. doi:10.1119/1.1710063. Bibcode: 2004AmJPh..72..961A.

## External links

* Making a vacuum bazooka
* Making a supersonic vacuum bazooka

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