I have always carried a two blade trapper, partly for tradition and partly for function.
Tradition: Every working cowboy I've ever know has carried a trapper. My grandfather gave my dad a trapper when he was a boy and taught him how to sharpen and care for it. My dad did the same thing for me when I was eight.
Function: The reason we carry these trappers is branding and castration of calves. The spey blade is for ...(snip)
Ben, this is just a wonderful post. In my mind, function and authentic tradition are linked closely. As the nature of work changes in our increasingly electronic/service oriented economy, I think it's critical to have things in our lives to remind, if not who we are in terms of our current work but at least who we are in terms of where we came from.
It's a great thing to be reminded that many of the blade shapes and blade combinations are rooted in various forms of animal husbandry. I think of this anytime I carry my 4 blade camper knife, as my understanding is that the combination of spear point and awl derived from the teamsters' need to cut leather straps and punch new holes when repairing rigging.
I think this tie to my own past is why I am so moved by the lock back folding hunter design. I can't handle my Buck 110 without thinking about walking in the Vermont woods with my Grandfather and that 110 goes with me when I drive from very metropolitan Boston to very not metropolitan north wood of Vermont to the family deer camp. The 110 is a lousy EDC knife though and totally unsuitable for deployment in my work place!!!
I'm open to the argument that the modern urban/suburban functional knife is either the SAK or Leatherman type multi-tool. Instead of broken leather straps, many people deal with screws and plastic packaging on a day in, day out basis. So, if by "blades" we mean small scissors, screw drivers and files, I'll take that on functional grounds - almost. As a former bike mechanic, I really can't abide folding screwdriver heads on SAKs and multi-tools. When I look at a screw that needs to be scewed and I look at my multi-tool, I know full well that the outcome is likely to involve some combination of a stripped screw head, twisted blade, loose bolster, barked knuckles and course language. I still carry my 4 blade camper knife a lot of days (may today for the heck of it) but mostly because I carried one as a kid. But I'll insist that its a bottle opener (which I'll use tonight), not a screw driver.
But most days, the intersection of tradition and function for me is a small single blade lock back like my Schrade 5OT. It's a baby hunting knife. It does really every cutting function I can think of better than any slip joint I've owned (I don't castrate bulls, nor punch holes in leather straps) and it reminds me of hunting with my grandfather in a round about way.
Interesting discussion. Would really like to hear from others how and when they find the different blade shapes to be functional for them.