Morimotom,
I hear you and Foo. Makes sense to me. Now can someone explain to me what use a NUKE knife would have, really? Seems to me (and I own one) that they are more aesthetic in design, than functional...but then again, I am not a HEAVY knife user.
there are practical reasons, and theoretical reasons.
practical reasons -
1) decreases blade side weight distribution. makes the knife more neutral balanced by lightening the blade.
2) provides better penetration when inserting the knife into a given media, by cutting both sides of the entrance, and by thinning out the knife and making the distance required to push the material apart less. this is the basic reason why "penetrator tips" are applied by busse on non double edged models.
3) provides a second edge for using during excessively abusive tasks such as cutting wires, allowing your main edge to remain undamaged.
theoretical reasons -
fighting purposes.
[edit]
scratch that first example, you do actually turn your wrist in the back arm strike in escrima... otherwise you'd be using tiny forearm/wrist muscles, and you'd get no power form the strike. so instead:
stabbing:
same reasons as practical reason number 2. in this case, the media is human flesh and organs.
the back slash/cut:
an example would be getting in close in order to apply the knife to the back of the neck. it is more difficult for a normal person to deal with having a knife sawing at the back of their head pulling them into the person who is doing it then it is for a person to deal with someone sawing at the front of their neck, trying to keep them from pulling away. why? when you pull away in scenario one, you reinforce the knifes edge on your neck. it's a squeamish situation. the unrealistic portion of this is that most of the "nuclear" edges on busse knives are not sharp by any practical terms. some of the deep dish hollow knives are, especially the ones that have big wide primary grinds, giving a better cutting geometry. most however are triangles, with almost 90 degree' included main grinds.
applied force:
when grappling, you can use your knife to push a persons limb or body in the direction you want it to go. you can do this by suggestive force (not cutting them), or by applying force to an injury, cutting them, then pushing on it. by having the second edge, you are given more options on how you can use the knife in an applied force to injury scenario. for those who are unafraid, crazy, or on pain killers, simply showing potential injury may have no effect, thus threatening someone with the back of a knife will probably result in them overpowering it. your wrist is not stronger then a full grown mans upper torso. if you have an edge on it however, they will notice the injury and be more willing to comply, unless they literally can't feel it, at which point at least your getting an injury in. however, the same problem that was stated in the black slash/cut about bad cutting geometries on the upper edge applies here.
personally I'm with morimotom on double edged blades. I scare myself with them, and find that they are a safety hazard. I would rather carry two knives then have one doubled edged knife.
