Recent content by cheekibreeki

Actually, there is no legal limit here in the Netherlands. And yes, using an airSOFT gun, which generally shoot around 70-120m/s, you can see the bb fly away, but I'm not building an airsoft gun. I'm building an air rifle, 6mm is just for the concept gun.

Homework Statement I need to accelerate a 0.2 gram projectile to 300 m/s within 80cm. How much force (N) do I need? Homework Equations E = F * S The Attempt at a Solution

How did you get those numbers? if E = F * S then 9 = 42.45 * x, then 42.45x = 9, then x = 9/42.45, x = 0.212. According to that formula the length of the barrel should be only 21.2 cm instead of 4.7 meters. ?

Another gun-related question: I'm building a pneumatic airgun and I'm trying to find out what pressure/barrel length I have to use for a given muzzle velocity. I've done a bit of number crunching but I keep coming up with insane barrel lenghts, and that's not even considering any friction...

Thanks, that makes things a whole lot easier!

Hey people, first post, I'm sorry if I'm posting this in the wrong place. How do you calculate the force exerted on a sphere? I'm building a pneumatic air rifle, and I'm trying to figure out how fast an airsoft bb accellerates with a certain pressure. The projectile is 6mm in diameter, so...