[Gryphon_]

Originally Posted by Viikate

Your standard hand grenade is built to limit the effective radius of the fragments or else it would kill the user too often.

http://www.fas.org/man/dod-101/sys/land/m61.htm
See that fragmentation coil there. It is limiting the fragment killing radius to few meters.

Here is some calculation for the same grenade in ideal conditions without the fragmentation coil. 185g of Comp-B should be enough to give 2g fragment 480m/s speed at 100m.

http://www.fas.org/man/dod-101/navy/...s/Warheads.htm

The purpose of the fragmentation coil on a hand grenade is to provide the fragments, not to limit the fragmentation range in some way.

Your link to the Gurney equation covers the fragmentation part of the picture theoretically but note that the calc is per fragment, and there are a lot of 2g fragments in a fragmentation coil. The 5m statistic is just that; it is probable that enough frags will hit you to kill you at under 5m, injure you badly at under 15m, but might injure you to some degree a lot further out than that. Last time I threw a hand grenade I put something solid between me and the bang. Much safer than statistics..

The Gurney equation doesn't cover blast effect.