Originally Posted by Brian McIlmoyle
no I don't think so ... 2 different forearms .. and no certainty if the angle of incidence of the shot was the same .. this was at best an informal test with anecdotal results.
these are facts.
the size of the projectile is the same
the mass of the projectile is the same
the velocity of the projectile is the same
therefore the kinetic energy of the object in motion would be identical.
the question is .. what is the energy transfered to the target upon impact?
I'll concede that plastic to hard surface some energy is dissipated to the deformation of the plastic bb that would not be dissipated in the silica bb
but on a plastic or glass to soft surface ( such as skin ) the fact that the material is harder than the impact surface indicates that no energy would be dissipated to the deforming of the BB .. because it does not deform.
Deceleration and energy transference to the soft surface would be the same for either projectile.
Therefore these bbs are no more or less safe than their plastic counterpart.
Except in the impact to teeth.. where I expect they will shoot out more teeth than plastic bbs
Ballistic Jelly would be a good way to illustrate this
Finally someone said it, that bb's don't deform on skin to dissipate energy.