[wilsonmw04]

Originally Posted by EricH

No, you don't. 1 will do just fine, if you have a back plate to compress against. 2006 showed that. Contact time has little or nothing to do with it.

From a Physics standpoint I'm not sure that argument holds water. With all things being equal, the amount of time that I apply a given force will directly affect the velocity of an object. The more time I have to apply the force the faster the object will travel. For example: compare the muzzle velocities of a pistol vs. that of a rifle.