Okay, guys, just to make sure I wasn't crazy, I went out to the garage and tried some cutting tests. I used a serrated edge knife and two plain edge knives. I used just one serrated edge knife, because all spyderco serrations are ground at about the same angle. For this test, I chose one of the greatest knives in the history of knives
, the Spyderco Endura fully-serrated (sorry Bartman, you had not replied before I started the tests). For my plain edge knives, I chose my two carry knives. The Spyderco Calypso Jr. to represent ultra-thin-edged plain blades, and the Benchmade Axis to represent thicker, less-specialized plain blades. Note neither of these had the very coarse finish that I would use to make them really competitive.
Okay, first test was on rope that was thin enough to be push-cut. I cut the rope the way I normally do -- looped in one hand, cut against the inside of the loop. Calypso Jr. was the hands down winner here, I could do a push-cut through it without exerting much effort. The thicker-edge Axis came in second, I had to do 60% push cut 40% slice, but once the recurve hit it zipped through easily. With the serrated Endura I had to use mostly slicing, which is noticeably less efficient for cutting a rope that could have been push-cut.
Next test was thicker harder rope that had to be sliced. The ultra-thin and too-polished Calypso Jr. still did surprisingly well, I push-cut hard and sliced just enough to keep things biting. It was a bit behind the other two. The endura was awesome, but somewhat to my surprise the Axis did even better! The recurve, coupled with a high thin edge, makes it perform nicely. So much for slicing rope -- I actually got a plain edge to perform at par of even better than the serrated. It repeated it with the hardest poly rope I could find. The harder the rope the better the serrated does, but the Axis was still ahead by a nose.
Next up, ultra-hard plastic. Here the serrated edge truly is king, it kicked butt. The Axis did okay, but really needs a rougher grit on the edge to compete better. Even so, I don't think it'll ever match the serrated edge. I didn't bother trying the Calypso.
On to cardboard and the zipper cut. Calypso Jr.'s thin edge is the winner here. Both the endura and Axis aren't too far behind. But the thing about serrated blades is, they can only zipper-cut efficiently if what you're cutting has a lower diameter than the diameter of the recurve. Once I thickened the cardboard, the serrated edge stopped zipper cutting efficiently. That's a good point to bring out -- if you're zipper-cutting thin things, the serrated still works.
Next stop whittling, where the Calypso Jr. and Axis performed excellently, the serrated edge not so great.
Didn't bother chopping veggies and preparing food, have tried it before many times and know the results already. There's a reason professional chefs use mostly plain edge knives. The recurve on the Axis makes it less suitable for this work, also. The Calypso kicks butt.
Then I did some limp-material tests. How relevent this test is varies from user to user. I seem to do a reasonable amount of it. Cutting loose (usuall fibrous) material that I'm trying to hold stationary with one hand and cut with the other. The serrated edge snags the material and pulls it around. The plain edge can often push-cut through it.
Anyway, I'll say again that if you're dong certain jobs, a serrated edge makes lots of sense. With certain other jobs (I think a wider range of jobs), a plain edge makes sense. I just wanted to show that phantom's claim that serrated edges outcut plain edges isn't true -- this happens only in some jobs.
Trying very hard not to be insulting, I will also express my belief that one big difference is the skill it takes to make a serrated or plain edge perform. With a serrated edge, the performance all comes for free -- performance is ground in at the factory. With a plain edge, you may have to re-sharpen and correctly choose the right bevel angles and grits to get the performance you need. A typical Axis straight from the Benchmade factory wouldn't cut the way my hand-honed version does. It isn't that difficult to get it performing this way, but you have to know what to do. Probably everyone involved in this string can do it just fine.
Of course, once I was finished I realized I cheated a little bit. The Axis, due to the recurve, isn't an apples-to-apples test.
Joe
jat@cup.hp.com