A cheaper solution
by
bm_luethke
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· Score: 4, Interesting
If someone is interested in a cheaper solution (or to make thier own) see here
The also have some really cool stuff with machined aluminum potato cannons using propane and oxygen!
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Sorry about the spelling, I suffer from two problems. Dyslexia makes it difficult to spell well, lazy makes it
Do we need a gun license for this?
by
AtomicBomb
·
· Score: 4, Interesting
I am not quite sure about US, but, if you are living in UK or other countries with similar law, you may need a gun license to operate this.
Usually, a gun is defined as a device which can fire a projectile/bullet with an energy of greater than 2J measured at the muzzle.
Assuming the weight of a T-shirt is 40 g, the max height it reaches is 50m, ignoring all the loss due to friction/air resistance, the min energy is mgh=0.04*9.81*50=19.6J...
If someone is interested in a cheaper solution (or to make thier own) see here
The also have some really cool stuff with machined aluminum potato cannons using propane and oxygen!
------- Sorry about the spelling, I suffer from two problems. Dyslexia makes it difficult to spell well, lazy makes it
I am not quite sure about US, but, if you are living in UK or other countries with similar law, you may need a gun license to operate this.
Usually, a gun is defined as a device which can fire a projectile/bullet with an energy of greater than 2J measured at the muzzle.
Assuming the weight of a T-shirt is 40 g, the max height it reaches is 50m, ignoring all the loss due to friction/air resistance, the min energy is mgh=0.04*9.81*50=19.6J...
Take care!