NINJA KNIFE THROWING

Another important factor to consider is design. A Ninja
may wish to own more than one type of throwing knife.
Many of the current designs throw well, with practice, but
the most important factors with regard to throwing knives
are:
Length
Weight
Balance
Length is the first crucial factor. For a throwing knife to
have good flight characteristics, power and penetration, it
must be at least nine and no more than sixteen inches in
length. A knife any shorter than nine inches will often result
in poor penetration; any length beyond sixteen inches will
cause the knife to be awkward and difficult to throw. Smaller
throwing knives may be used as distractions, but they
seldom cause serious wounds, and they are virtually
nonlethal.