Damn, Darrel, You ask some tough questions!
Ok, let's see...A fighter in my minds eye is fast, sleek, strong and sharper than my mother-in-laws tongue. It will allow me to change my grip from forward to reverse without having odd protrusions to catch on my hand. At the same time, the grip should stay locked into my hand when I choke down on it. A pommel that will allow me to use it as a skull-crusher is good too. It should have a finger guard that will protect my hand from being cut by the opponent and prevent my fingers from sliding down over the blade. It should have a profile that will allow me to slash efficiently as well as stab. And I don't mind if it looks good either
A folder...Well, what you're doing with the EDC looks good to me.
A camp knife should offer a good grip that won't cause hotspots on your hand when you use it for extended periods. The balance should be slightly blade heavy to allow for better chopping. The edge should be strong to withstand the rigors of heavy chopping, cutting, digging and all the other things you may do with a camp knife. The blade as well should be of a sufficient thickness and heat treat to prevent it from breaking when you need it the most. Stainless steels are in my opinion a requirement for a camp knife, not so important with a fighter. The blade profile should allow for using the point for fine work and so shouldn't be too long. Probably around 7 to 9 inches. A fighter blade should be anywhere from 6 to 12 inches long. Materials for handles should be impervious to the environment, and provide good grip even when wet with blood, water, or other liquids. This goes for both fighters and camp knives.
Hmm, that's about it... Ofcourse this is far from Gospel, it's merely my humble opinion and to an extent the criteria I use when I make a knife design...As evidenced in the knife Jerry Hossom made for me. He had a large influence on the handle design and I learned quite a bit from him on handle designs. And a whole lot of other stuff.
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Regards
Joshua "Kage" Calvert
"Move like Water, strike like Thunder..."