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This is the Starfire Space Cannon. It's been built and tested by Richard Graf and his cohorts up in Cochrane, Canada. The goal of the Starfire cannon is to launch small, lawn dart-sized projectiles into orbit as vehicles for small satellites. Of course, there is a small problem with this sort of project: governments, even happy-go-lucky Canadian ones, don't much like it when you own a cannon capable of starting an international incident.
Graf is of the opinion that space is for everyone, and he means to get us there, one cannon shell at a time. To that end, he's constructed a 45-foot long cannon with an eight-inch bore. To further speed his projectiles into space, he's designed his cannon to fire its propellant in sequential charges as the shell — er, launch vehicle — travels down the barrel. Graf says this will break up the massive G forces which a projectile endures as it's fired.
Kind of like air traffic control but in space? Space orbit control, run by an international body?
As fun as this is, depending the altitudes achieved, it concerns me a wee bit in consideration of orbital parking, and the substantial and even dangerous mess that could be made.
Have they test filed their cannon? It seems kind of risky, as how do they know it will achieve orbit and not just kill a moose downrange, as well as just splattering these things in space without having a clear idea of orbit and placement. Shooting off a space-capable cannon, and making "space available to everyone" have overtones of clearly catching critical criticism calmly.