posted on Sep, 25 2013 @ 09:52 AM
the problem is - lack of room in the human hand / arm
please look at :
pic one - the gross anatomy of the human arm bones
pic 2 - the gross anatomy of the human hand
where are you going to ` stow ` the claw ?
it is not a trick question
the human arm / hand is a magnificent limb - and radically different to the limbs / paws of creatures with retractable claws
heck - just hold your arm up and watch it while you exercise a gull range of movements from the elbow down
having 300mm " doom claws " may sound cool - but you will loose the movement in at least on joint while they are retracted - which defeats the
usefulness of your hand
if you want to slice and dice someone - get a sword and learn to use it - simples