On 12/2/2011 4:31 AM, Roger Burton West wrote: > On Fri, Dec 02, 2011 at 07:26:34AM +0100, Onno Meyer wrote: > >> Did I get the physics right? > > Yes. The dV is the muzzle velocity, of course, which for anything modern > will be quite small by comparison with low orbital speeds (1700m/s for a > KEP tank round, says Wikipedia, compared with 7800m/s for a 100-mile > orbit round Earth or 3100m/s for GEO). (I'm assuming circular orbits > here.)
Don't forget that you only get some of that. The other part is going into the firing platform. This is all proportional to the mass of the platform and the projectile of course. And I suppose the cannon could be recoil-less with proper gas venting. _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
