Dave - unless there was "cross talk" between the craters on impact, a single projectile will make a single crater and can be directly controlled. Impact craters are very velocity dependent. Has your boss reviewed the high velocity cratering studies done at Arnold Engineering Development Centerback in the late '60's and early 70's? They used a high velocity rifle for this kind of work. I doubt that the temperature of the impacting particle has much, if any, influence. I know that the composition has less influence than you would suppose; I remember photos of a small (5 grain nylon sphere at near 10,000 fps) projectile driving through a "cast iron" frying pan. Velocities up to around 10,000 fps can be generated with gas expansion guns. After that, you get into rail guns.
2-p, did you do any work on this or have any additional recollections from AEDC?
